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Wildlife Expeditions

Wildlife of
Bering Sea

Cold, productive sea between Alaska and Russia
134 Species
~2.29 million km² Area
~4,097 m Max Depth
Overview

Understanding This Category

The Bering Sea is a high-latitude marginal sea of the North Pacific Ocean situated between Alaska and eastern Russia, linked to the Arctic Ocean through the Bering Strait and characterized by broad continental shelves, strong seasonal sea-ice dynamics, and high biological productivity.

The Bering Sea forms a pivotal marine crossroads between the Pacific and the Arctic, where cold polar influences meet subarctic waters along an expansive continental shelf. Its geography is dominated by wide, shallow shelf seas (notably over the eastern Bering shelf) contrasted with deeper basins to the west and south, creating sharp gradients in temperature, salinity, and nutrient availability that shape distinctive habitats.

Seasonal sea ice is a defining driver of the Bering Sea's ecology. In winter and spring, ice growth and retreat influence water-column stratification and timing of phytoplankton blooms, while wind, tides, and currents promote mixing and transport across the shelf. These physical processes-along with nutrient replenishment from upwelling, shelf-break exchanges, and inflow from the North Pacific-fuel exceptionally productive food webs.

As a result, the Bering Sea supports some of the world's most important commercial fisheries and sustains abundant marine life, including large populations of seabirds and marine mammals. Its ecosystems are tightly coupled to climate variability: changes in sea-ice extent, ocean temperature, and circulation can shift productivity patterns, alter species distributions, and reshape the balance between pelagic (open-water) and benthic (seafloor-based) food webs.

Etymology: The sea is named after Vitus Bering, a Danish-born navigator in Russian service who explored the region in the 18th century during expeditions that helped map the North Pacific and the waters between Asia and North America; "Bering Sea" thus denotes the sea associated with Bering's explorations.

Key Characteristics

High-latitude marginal sea of the North Pacific between Alaska and eastern Russia
Connection to the Arctic Ocean via the Bering Strait, enabling Pacific-Arctic exchange
Extensive continental shelf (especially the eastern Bering shelf) with strong shelf-slope interactions
Strong seasonality, including winter sea-ice formation and spring retreat that regulates bloom timing and habitat
High nutrient supply and mixing/upwelling processes that drive exceptional primary productivity
Supports globally significant fisheries and rich marine ecosystems sensitive to climate variability
At a Glance

Quick Facts

Type Sea
Area ~2.29 million km²
Max Depth ~4,097 m (Bowers Basin)
Temperature ~−1.7 to 10°C seasonally (surface)
Salinity ~32-34 ppt (varies with ice melt and river input)
Bordering Countries United States (Alaska) and Russia

One of the world's most productive fishing grounds (Alaska pollock, crab), seasonal sea ice, and rich marine mammal & seabird ecosystems

Physical Features

Geography

The Bering Sea is a high-latitude marginal sea in the North Pacific, lying between western Alaska (USA) to the east and eastern Russia (Chukotka and Kamchatka) to the west, and extending northward to the Bering Strait where it connects to the Arctic Ocean.

≈2.3 million km² Area
~1,600 m (mean depth; broad shallow shelves in the north/east with much deeper basins in the south) Average Depth
~4,097 m Max Depth

Bowers Basin (southern Bering Sea, near the Aleutian arc)

Major Features

  • Eastern Bering Sea continental shelf (one of the world's broadest shelves)
  • Shelf break and slope system supporting upwelling and high productivity
  • Aleutian Basin (deep basin in the southern Bering Sea)
  • Bowers Basin (deep basin; includes the sea's greatest depths)
  • Shirshov Ridge (prominent submarine ridge trending north-south)
  • Bowers Ridge (submarine ridge separating basins and influencing circulation)
  • Zhemchug Canyon (large submarine canyon incising the shelf break)
  • Navarin Canyon (major canyon system on the shelf break)
  • Pribilof Canyon system (shelf-break canyon complex influencing cross-shelf exchange)

Islands

  • Aleutian Islands
  • Pribilof Islands (St. Paul Island, St. George Island)
  • St. Lawrence Island
  • Diomede Islands (Big Diomede, Little Diomede)
  • Nunivak Island
  • St. Matthew Island
  • King Island
  • Commander Islands

Coastline Countries

United States

Borders the eastern Bering Sea via Alaska, including extensive continental shelves that host major fishing grounds.

Russia

Borders western and southwestern Bering Sea along Chukotka and Kamchatka Peninsula, including gulfs and shelves affected by seasonal sea ice.

Connected Waters

  • North Pacific — Open connection to the North Pacific through passes in the Aleutian Islands, letting strong water and nutrient exchange.
  • Arctic Ocean — Narrow connection to the Arctic Ocean via the Bering Strait (north), controlling seasonal inflow/outflow and sea-ice-related processes.

Boundaries

East: Alaska (including the Seward Peninsula and Yukon-Kuskokwim delta region). West: Russian Far East (primarily Chukotka and the Kamchatka Peninsula). South: the Aleutian Islands island arc forming a partial boundary with the open North Pacific. North: the Bering Strait (between Alaska and Russia) leading to the Chukchi Sea/Arctic Ocean.

Physical Characteristics

Oceanography

Temperature Range ~ -1.8 to 12 °C (near-freezing in winter/under sea ice; coolest at depth; warmest at surface in late summer on the shelf)

Surface avg: ~4-7 °C annual mean at the surface (strong spatial/seasonal variability; colder north/near ice, warmer south/shelf in late summer)

Deep avg: ~1-3 °C typical below the seasonal thermocline and in deeper basin waters (locally colder near the bottom on the northern shelf; generally a few degrees above freezing)

Salinity Moderate to relatively low (subarctic) with strong shelf gradients

Typical salinity ranges ~31-33.5 PSU across much of the shelf and basin. Freshening occurs in spring/summer from sea-ice melt and river inputs (notably the Yukon and other Alaskan rivers), producing a low-salinity surface layer on the eastern shelf and in the north. Saltier Pacific-origin waters (~33-34+ PSU) enter through Aleutian passes and dominate deeper/basin waters and portions of the outer shelf.

Seasonal Variation

Winter: extensive sea ice over much of the shelf; surface water near freezing (-1.8 to 0 °C). Spring: rapid freshening/stratification from ice melt; surface warms to ~0-4 °C. Summer: surface warms broadly (~4-12 °C; typically ~6-10 °C on the shelf, lower offshore). Autumn: cooling and storm-driven mixing erodes stratification; surface drops back to ~0-4 °C before freeze-up.

Currents

Major systems include: (1) Aleutian passes inflow of North Pacific water (notably through Unimak and other passes) feeding the southeastern Bering; (2) the Bering Slope Current (northward along the continental slope, transporting slope/basin water and eddies); (3) shelf circulation with the Anadyr Current (cold, nutrient-rich northward flow on the western shelf) and the Alaska Coastal Current (northward along Alaska, relatively fresh and warmer in summer); (4) exchange through the Bering Strait-net northward transport into the Chukchi/Arctic with strong seasonal and wind-driven variability; (5) mesoscale eddies along the slope enhancing cross-shelf exchange and nutrient supply.

Tides

Mixed, largely semidiurnal tides with strong spatial variability. Large tidal ranges and vigorous tidal currents occur around the Aleutian passes and some shelf regions, driving strong mixing fronts. The broad eastern shelf often exhibits pronounced tidal mixing that helps set up stratification boundaries (tidal fronts) between well-mixed coastal/shelf waters and more stratified mid-shelf waters. Seasonal sea ice can damp surface expressions and alter friction/mixing locally.

Water Masses

A subarctic marginal-sea system combining Pacific inflow, shelf-modified waters, and seasonal ice processes. Key characteristics include: (1) Pacific-origin waters entering via Aleutian passes, relatively saltier and nutrient rich compared with coastal waters; (2) a seasonally freshened surface layer from ice melt and river runoff; (3) cold bottom/shelf waters maintained by winter cooling/ice formation and subsequent isolation beneath summer stratification ("cold pool" on the eastern shelf); (4) northward export of modified Pacific water through the Bering Strait into the Arctic, often relatively freshened and cooled compared with source waters.

Stratification

Strongly seasonal. Winter: weak stratification and deep mixing on much of the shelf due to cooling, wind, and brine rejection during sea-ice formation (locally increasing salinity in subsurface/bottom waters). Spring: rapid stratification from ice melt and warming creates a shallow halocline/thermocline. Summer: pronounced two-layer structure-warm, fresher surface layer over colder, saltier bottom water; the eastern shelf often maintains a persistent near-bottom cold pool separated from the surface by a strong pycnocline. Autumn storms progressively erode stratification and deepen the mixed layer.

Upwelling

Key nutrient supply zones include: (1) slope and shelf-break upwelling along the continental margin (wind-driven and eddy-assisted), bringing nutrient-rich deeper water onto the outer shelf; (2) Anadyr region/western shelf where nutrient-rich Pacific waters and tidal mixing enhance productivity; (3) Aleutian passes and nearby shelf areas where intense tidal mixing and topographic interactions pump nutrients upward; (4) localized coastal and canyon-associated upwelling hotspots (episodic), especially during favorable wind events and in association with the Bering Slope Current and mesoscale eddies.

Unique Conditions

Seasonal sea ice strongly modulates light, stratification, and timing of phytoplankton blooms (including under-ice and ice-edge blooms). Formation of the eastern-shelf "cold pool" creates a persistent summer bottom-water habitat near 0-2 °C that can act as a thermal barrier influencing fish distributions. High storminess and strong winds drive rapid shifts between stratified and mixed states, affecting nutrient delivery and bloom dynamics. Significant cross-shelf exchange via eddies and fronts concentrates productivity and can create sharp ecological boundaries. Interannual variability is large, tied to sea-ice extent/timing, Pacific inflow, and atmospheric modes, producing notable regime shifts in temperature, ice cover, and ecosystem structure.

Weather & Conditions

Climate

The Bering Sea has a cold, subarctic to polar marine climate shaped by high latitude, strong wintertime heat loss, frequent low-pressure systems, and pronounced shelf-slope oceanography. Conditions range from ice-covered, frigid winters over much of the shelf to cool, fog-prone summers with strong stratification and high biological productivity driven by mixing and nutrient supply (including shelf break processes and episodic upwelling). Air-sea temperature contrasts, strong winds, and currents (including exchanges through the Aleutian passes and the Bering Strait) strongly modulate regional weather and ecosystem dynamics.

Seasons

Winter (Nov-Mar): Very cold air outbreaks are common; strong northerly winds can advect sea ice southward across the shelf. Air temperatures often well below 0°C over the sea, with frequent snow and blowing snow; ocean surface near the freezing point (~−1.8°C) where ice forms. Spring (Apr-Jun): Rapid transitions as daylight increases; sea ice retreats (timing varies greatly by year). Stratification increases with meltwater, influencing the spring bloom; weather remains changeable with lingering gales. Summer (Jul-Sep): Cool maritime conditions (often ~5-12°C air over open water), frequent low cloud and fog, and generally reduced sea ice (mostly absent except far north in many years). Surface waters warm modestly on the shelf; fronts and eddies remain important for nutrient delivery. Autumn (Oct-early Nov): Strong cooling, increasing storms, and breakdown of summer stratification; sea ice begins forming in the north and expands southward as temperatures drop.

Storm Activity

Tropical cyclones do not typically occur in the Bering Sea. Instead, storminess is dominated by mid-latitude/extratropical cyclones, especially from late autumn through spring. Powerful Aleutian Low systems can bring gale to storm-force winds, high seas, heavy precipitation, and rapid pressure falls; these storms drive major mixing, coastal surges, and ice motion. Occasionally, the remnants of western North Pacific typhoons transition to extratropical systems and can enhance wind and wave events over the southern Bering Sea and Aleutians in late summer-autumn.

Ice Conditions

Seasonal sea ice is a defining feature, especially over the broad eastern and northern shelves. Ice typically forms in the north in autumn/early winter and expands southward through winter, with extent and duration varying strongly year to year (warm years can have much reduced southern/central ice). Maximum extent is usually late winter to early spring, followed by retreat in spring and early summer. Ice types include first-year pack ice, drifting floes, and leads/polynyas driven by winds and currents; meltwater promotes strong spring stratification and influences productivity. The southern deep basin is often ice-free, while the northern shelf and areas nearer the Bering Strait are more persistently ice-affected.

Ecology

Marine Life

The Bering Sea is a cold, high-latitude marginal sea with exceptionally high primary and secondary production driven by seasonal sea-ice dynamics, nutrient-rich shelf waters, strong tidal mixing, and slope/shelf-break upwelling. Its broad continental shelf, recurring ice-edge blooms, and productive fronts support large biomasses of zooplankton, forage fish, groundfish, seabirds, and marine mammals, making it one of the world's most important high-latitude fishing and wildlife regions. Ecological structure shifts strongly with season (ice-covered to open-water) and across major water masses (coastal, middle-shelf, outer-shelf, and slope domains).

High Biodiversity

Biodiversity is high for a polar/subpolar system, with particularly high biomass and strong food-web coupling from ice algae and spring phytoplankton blooms to zooplankton, fish, seabirds, and marine mammals. Species richness is generally lower than temperate/tropical seas, but habitat diversity (ice-edge, shelf, canyons, nearshore kelp/eelgrass, and deep slope) and the overlap of Arctic and North Pacific faunas elevate overall diversity. Community composition and functional diversity vary markedly with sea-ice extent, temperature regimes, and shelf-slope exchange.

Species count: Approx. 300-450 fish species reported across the broader Bering Sea region; 20+ marine mammal species; dozens of regularly occurring seabird species (with 30-40+ key breeding/foraging species); and thousands of benthic invertebrate taxa (crabs, clams, echinoderms, sponges, corals, etc.).

Ecosystems

  • Seasonal sea-ice ecosystem (ice algae, under-ice and ice-edge blooms)
  • Continental shelf soft-sediment benthic communities (bivalve-, polychaete-, and amphipod-dominated areas)
  • Shelf-break and slope upwelling/front systems (high pelagic production)
  • Submarine canyons (e.g., prey aggregation and hotspot feeding areas)
  • Pelagic open-water ecosystem (zooplankton, forage fish, salmonid migration corridors)
  • Cold-water coral and sponge gardens (structure-forming benthic habitats, especially along the slope)
  • Nearshore kelp forests (rocky coasts, especially around island/peninsular margins)
  • Eelgrass (Zostera) meadows and coastal lagoons/estuaries (nursery and foraging habitat)
  • Polynyas and recurring open-water areas within/near seasonal ice (localized productivity hotspots)

Endemic Species

  • Steller's sea cow (Hydrodamalis gigas) - extinct; historically restricted to the Commander Islands/Bering Sea region
  • No widely recognized extant marine vertebrate species are strictly endemic to the Bering Sea; most species are shared with the North Pacific and/or Arctic, with endemism more often expressed at population/subspecies levels rather than as Bering Sea-only species
Habitats

Ecological Zones

Neritic Zone

The Bering Sea neritic zone spans the broad continental shelf-especially over the eastern Bering Sea shelf-where shallow, cold waters, strong tidal mixing, and seasonal sea-ice formation create one of the world's most productive coastal marine regions. Spring and early-summer phytoplankton blooms are often triggered by ice-edge melt and increasing light, while shelf fronts (notably the "cold pool" boundary) organize nutrients and prey into bands that concentrate fish, seabirds, and marine mammals. Extensive shoals, embayments, and river-influenced coastal areas around Alaska and Russia support nursery habitat for juvenile pollock, crab, and flatfish, and provide feeding grounds for walrus and gray whales where benthic prey is abundant. Productivity and habitat structure vary strongly with ice extent, wind-driven mixing, and inflow of nutrient-rich waters from the Aleutian passes.

Pelagic Zone

The pelagic zone of the Bering Sea includes deeper basin waters and the open-water surface layer beyond the shelf break, where wind forcing, mesoscale eddies, and exchange with the North Pacific and Arctic govern nutrient delivery and plankton dynamics. Primary production peaks in spring-summer as light returns and stratification develops, with episodic nutrient replenishment from shelf-break upwelling, eddy transport, and winter mixing. Zooplankton communities (copepods and euphausiids/krill) can be exceptionally dense, supporting pelagic forage fish and squid, and in turn higher predators such as salmon, seabirds, and toothed whales. Seasonal sea ice modifies pelagic timing and composition: ice-associated algae can seed early production, while cold, fresh meltwater layers influence stratification and the match/mismatch between larval fish and zooplankton prey.

Benthic Zone

The benthic zone is dominated by the vast soft-sediment seafloor of the continental shelf and slope, with localized rocky substrates near islands and the shelf break. Cold bottom temperatures, high organic matter deposition from surface blooms, and strong benthic-pelagic coupling support rich communities of clams, polychaete worms, amphipods, brittle stars, and other invertebrates. In many shelf areas, large fractions of primary production are exported to the seabed, fueling a "benthic-rich" system that is especially important in colder, ice-influenced years. Habitat and community structure vary with sediment grain size, currents, and disturbance (ice gouging in shallow areas, storm reworking), creating mosaics of prey fields that underpin walrus feeding grounds and shape the distribution of bottom-feeding fish and crabs.

Demersal Zone

The demersal zone-waters just above the seabed-hosts key commercial and ecological species that forage on or near bottom habitats and move along depth and temperature gradients. Walleye pollock often aggregate near the bottom over the outer shelf and slope during parts of their life cycle, while Pacific cod, sablefish (deeper), and flatfishes (e.g., yellowfin sole, Greenland halibut) exploit benthic and near-bottom prey. The demersal environment is strongly structured by the shelf's thermal features, including the seasonal "cold pool," which can act as a barrier or refuge influencing fish distribution, predator-prey overlap, and fishing patterns. Near-bottom currents and resuspension events redistribute nutrients and detritus, supporting benthic invertebrates and providing feeding opportunities for demersal fish, skates, and crabs.

Migratory Season

Notable migrations are strongly seasonal and track ice retreat, prey pulses, and spawning cycles. In spring and early summer, many seabirds move north and into the shelf region to breed and exploit bloom-driven forage fish and zooplankton concentrations; large feeding aggregations occur near fronts and the shelf break. Anadromous salmon (notably sockeye, chum, pink, and coho) migrate through and feed in the Bering Sea during ocean phases, with timing varying by stock and year. Gray whales migrate from breeding areas to summer feeding grounds in the northern Bering and Chukchi seas, often focusing on benthic prey hotspots; bowhead whales and some beluga populations move with the ice edge and into the Arctic via the Bering Strait. Pacific walrus migrate with sea ice, using it as a resting platform while foraging on shelf benthos, and many fish (e.g., pollock, cod) undertake seasonal movements between feeding areas and spawning grounds, including along the shelf break and Aleutian passes.

Key Food Webs

Bering Sea food webs are built on high primary production and strong benthic-pelagic coupling, with pathways that shift with ice conditions. (1) Ice-edge/pelagic chain: ice algae and spring phytoplankton blooms → copepods and krill → forage fish (capelin, herring) and juvenile pollock → seabirds, salmon, seals, and toothed whales. (2) Pollock-centered mid-trophic web: phytoplankton → zooplankton → walleye pollock (a major energy conduit) → predators such as Steller sea lions, fur seals, larger fish, and some seabirds. (3) Benthic-dominated chain (especially on the shelf): phytoplankton export/detritus → benthic invertebrates (clams, amphipods, polychaetes) → Pacific walrus, gray whales, eiders, and bottom-feeding fishes/crabs. (4) Shelf-break/slope pathway: upwelling-enhanced production and krill/squid along the slope → salmon, seabirds, and larger predators. Climatic variability (sea-ice extent, temperature, stratification) alters the balance between pelagic retention versus export to the benthos, reshaping prey availability and cascading to fisheries and top predators.

Species

Iconic Marine Life

Steller sea lion A large pinniped strongly associated with the Bering Sea and Aleutian region; it hauls out on rocky coasts and islands and depends on the Bering Sea's productive shelf and slope waters for fish and squid, making it a prominent symbol of the region's rich (and heavily fished) food web.
Pacific walrus Iconic sea-ice-associated mammal of the Bering Sea; it uses seasonal ice as a platform for resting and calving and foraging on the shallow continental shelf, where it feeds primarily on benthic clams and other invertebrates-linking sea-ice dynamics to the seafloor ecosystem.
Polar bear
Polar bear Represents the Bering Sea's connection to the Arctic via the Bering Strait; bears rely on sea ice to hunt seals and are closely tied to the seasonal ice edge that shapes the northern Bering Sea ecosystem.
Northern fur seal
Northern fur seal A signature Bering Sea species with major breeding rookeries on the Pribilof Islands; its population and feeding ecology reflect the sea's high productivity and its sensitivity to changing ocean conditions and prey availability.
Bowhead whale
Bowhead whale A classic high-latitude, ice-associated whale that migrates through the Bering Sea and Bering Strait; it is closely linked to seasonal sea-ice and plankton-rich waters created by strong shelf processes and spring productivity.
Walleye pollock
Walleye pollock The single most important commercial fish in the Bering Sea, forming vast schools on the shelf and slope; its abundance underpins one of the world's largest fisheries and supports seabirds and marine mammals, making it emblematic of the region's productivity.
Red king crab A famed Bering Sea crustacean associated with cold, nutrient-rich shelf habitats; it is both an ecological predator/scavenger on the seafloor and a cultural-economic icon due to historic and ongoing crab fisheries.
Protection

Conservation

The Bering Sea remains one of the world's most productive high-latitude marine ecosystems, driven by strong shelf processes, seasonal sea ice, and nutrient upwelling that support globally significant fisheries and abundant seabird and marine mammal populations. However, rapid Arctic-influenced warming, sea-ice loss, and shifting ocean conditions are altering food webs and species distributions, while heavy fishing pressure, ship traffic, and localized pollution add cumulative stress. Management capacity is relatively strong in parts of the U.S. EEZ (science-based quotas, bycatch rules, protected habitat measures), but climate-driven ecosystem change and transboundary pressures increase uncertainty and risk across the wider region, including Russian waters and high-seas areas.

Status

Moderate but increasingly stressed; high productivity persists, yet climate-driven ecosystem shifts and cumulative human pressures elevate vulnerability.

Declining Current Trend

Threats

Climate Change critical

Rapid warming, reduced and shorter-duration sea ice, marine heatwaves, altered timing/strength of spring bloom and zooplankton production, northward shifts of fish distributions, and increasing ocean acidification-affecting prey availability for seabirds, pinnipeds, and cetaceans.

Overfishing high

Large industrial fisheries (e.g., pollock and other groundfish) can intensify food-web competition and bycatch risks; climate variability increases the chance of quota-setting mismatches with changing stock productivity and distribution, including cross-boundary management challenges.

Pollution moderate

Localized contamination from ports and coastal communities, legacy military/industrial sites in some areas, vessel-related discharges, and potential chronic inputs of plastics and microplastics; spill risk persists along shipping routes and near fuel storage/handling sites.

Human Disturbance moderate

Growing vessel traffic through the Bering Strait region and across the shelf increases underwater noise, disturbance to marine mammals, and risk of ship strikes, especially during migrations and near coastal haul-outs.

Resource Depletion high

Trophic reorganization and reduced availability of key forage species (e.g., changes in crab and small fish abundance in some periods) can deplete prey bases for predators, compounding climate effects.

Infrastructure low

Expansion/optimization of ports, shipping lanes, and coastal facilities increases disturbance, pollution risk, and habitat pressures in sensitive nearshore and island settings.

Habitat Loss high

Loss of seasonal sea-ice habitat reduces resting/foraging platforms for ice-associated seals and alters ice-edge productivity hotspots; coastal erosion and permafrost-driven change affect nearshore habitat and sediment loads.

Disease moderate

Warmer waters and changing species ranges can increase exposure to novel pathogens, harmful algal blooms, and parasite dynamics, with episodic mass mortality events possible in seabirds and marine mammals.

Natural System Modification high

Ecosystem-level regime shifts (e.g., changes in benthic-pelagic coupling, reduced cold pool extent) modify habitat suitability and community structure across the shelf.

Environmental Issues

Pollution

Marine debris and microplastics occur across the basin; localized contamination near settlements/ports and some legacy sites; ongoing risk from vessel discharges and accidental fuel/oil releases, especially along increasing shipping corridors and near island communities.

Overfishing

Many major U.S.-managed stocks have historically been managed with conservative harvest control rules and bycatch measures, but climate-driven shifts have increased uncertainty and led to heightened concern for some groups (notably periods of poor recruitment and reduced availability/abundance for certain crab and forage-dependent predators). Transboundary coordination and adaptive management are increasingly important.

ClimateImpacts

Warming is reducing sea-ice extent and duration, weakening the cold-pool barrier on the shelf, shifting plankton timing and composition, and moving species distributions northward. Ocean acidification is a growing risk for calcifying organisms and early life stages, with cascading food-web effects.

InvasiveSpecies

No single basin-wide invasive species dominates, but risk is increasing via ballast water, hull fouling, and poleward range expansions. Monitoring focuses on early detection in ports and nearshore zones and on tracking novel species appearing with warmer conditions.

Protected Areas

  • Alaska Maritime National Wildlife Refuge (includes extensive marine waters around Bering Sea and Aleutian Islands units)
  • Yukon Delta National Wildlife Refuge (coastal and nearshore habitats supporting migratory birds and marine species)
  • Togiak National Wildlife Refuge (Bristol Bay/Bering Sea coastal ecosystems)
  • Izembek National Wildlife Refuge (Izembek Lagoon and adjacent coastal/marine habitats)
  • Commander Islands State Nature Biosphere Reserve (Russia; marine and island ecosystems)

International Agreements

  • Convention on the Conservation and Management of Pollock Resources in the Central Bering Sea ("Donut Hole" Convention, 1994)
  • North Pacific Anadromous Fish Commission (NPAFC) Convention
  • International Convention for the Prevention of Pollution from Ships (MARPOL)
  • International Whaling Commission (IWC) framework
  • CITES (controls trade in listed marine species and products; relevant to parts of the region)
  • IMO Polar Code (safety and pollution-prevention requirements for polar shipping)

Conservation Priorities

  • Implement climate-adaptive fisheries management (dynamic reference points, spatial/temporal measures, and improved ecosystem indicators)
  • Protect and monitor critical habitats (ice-edge hotspots, benthic feeding areas, seabird colonies, and marine mammal migration/haul-out zones)
  • Reduce bycatch and food-web competition impacts (especially for vulnerable seabirds, pinnipeds, and depleted components such as some crab populations during low-productivity periods)
  • Strengthen spill prevention and response capacity, including community-based response in remote areas and tighter controls on ship discharges
  • Expand and coordinate transboundary monitoring (U.S.-Russia) for shifting stocks, biodiversity, and ecosystem health
  • Manage shipping impacts (routing, speed measures, seasonal advisories, and underwater noise reduction near sensitive areas)
  • Increase invasive species biosecurity (ballast/hull management, port surveillance, rapid response plans)
  • Support Indigenous and local co-management, food security, and long-term ecological observations to guide conservation actions
Notable Places

Famous Locations

Bering Strait

Strait

Narrow passage between Alaska (U.S.) and Chukotka (Russia) linking the Bering Sea to the Chukchi Sea (Arctic Ocean).

Key gateway for water, nutrient, and species exchange between the Pacific and Arctic; strategically important and a focal area for marine mammal migrations and sea-ice dynamics.

St. Lawrence Island

Island

Large island in the northern Bering Sea, roughly between Alaska and Russia, bordered by broad continental shelf waters.

Important habitat and subsistence area for seabirds and marine mammals; sits near productive fronts and polynyas that concentrate prey and wildlife.

Pribilof Islands (St. Paul & St. George)

Island

Volcanic island group on the southeastern Bering Sea shelf.

World-renowned breeding and haul-out area for northern fur seals and Steller sea lions; surrounded by highly productive fishing grounds.

Nunivak Island

Island

Large island off the Yukon-Kuskokwim Delta in the eastern Bering Sea.

Influences local currents and productivity on the shelf; supports rich birdlife and marine mammal use in nearby waters and polynyas.

Bristol Bay

Bay

Broad embayment on the eastern Bering Sea off southwest Alaska.

One of the world's most productive salmon regions and an ecosystem cornerstone for major commercial and subsistence fisheries; extensive shallow-shelf processes drive high biological productivity.

Kuskokwim Bay

Bay

Large bay along the southwestern Alaska coast opening into the eastern Bering Sea shelf.

Major migratory corridor and feeding area for marine birds and mammals; supports important regional fisheries and subsistence harvests.

Norton Sound

Bay

Shallow inlet of the eastern Bering Sea along western Alaska near the Yukon River delta.

Seasonal sea-ice formation and river inputs shape productivity; important for local fisheries and as habitat for marine mammals and seabirds.

Gulf of Anadyr

Bay

Large gulf on the Russian side (Chukotka), forming the northwestern reach of the Bering Sea.

Known for strong currents and high nutrient supply that support dense plankton and forage fish; an important feeding region for whales and seabirds.

Anadyr Strait

Strait

Passage between the Chukotka Peninsula and St. Lawrence Island, linking the Gulf of Anadyr with the northern Bering Sea.

One of the most productive corridors in the region due to mixing and upwelling; concentrates marine mammals, seabirds, and commercial fish species.

Commander Islands (Komandorsky Islands)

Island

Russian island arc at the western edge of the Bering Sea, including Bering Island and Medny Island.

Noted for rugged coasts and rich marine life; associated with unique populations of marine mammals and seabird colonies and forms a key biogeographic transition zone.

Aleutian Islands (Bering Sea side passes)

Island

Volcanic island chain forming the southern boundary of the Bering Sea, punctuated by numerous deep passes to the North Pacific.

Passes funnel nutrient-rich waters and drive mixing that supports major fisheries (pollock, cod, crab) and abundant seabirds and marine mammals.

Zhemchug Canyon

Trench

A major submarine canyon incised into the Bering Sea continental shelf and slope; it is recognized as one of the largest submarine canyons by volume.

Promotes upwelling and concentrates nutrients and prey, supporting high productivity and serving as an important feeding area for fish, seabirds, and marine mammals.

Navarin Canyon

Trench

Large submarine canyon cutting into the western Bering Sea shelf break near the Navarin Basin region.

A major conduit for shelf-slope exchange and nutrient delivery; supports high productivity and attracts commercially important fish and upper-trophic predators.

Bering Canyon

Trench

Submarine canyon system along the eastern Bering Sea slope, often discussed as part of the Bering Sea shelf-break canyon complex.

The canyon system can enhance localized productivity and create feeding "hotspots" that aggregate fish, seabirds, and marine mammals along the shelf break.

People & the Sea

Human Interaction

Historical Significance

The Bering Sea has long been a corridor linking Northeast Asia and North America, with Indigenous peoples using seasonal sea-ice and open-water routes for hunting, trade, and cultural exchange across what is now the Bering Strait region. It sits within the broader context of Beringia, the glacial-era land bridge and subsequent maritime crossroads that shaped human dispersal and long-distance contacts in the Arctic/subarctic. From the 18th century onward it became a focus of Russian imperial expansion and European scientific exploration-most notably Vitus Bering's expeditions (1730s-1740s), which helped map the strait and adjacent coasts and catalyzed the Russian fur trade. In the 19th-20th centuries the sea's commercial importance grew through industrial whaling and sealing (often destructive and contested), then large-scale fisheries development under evolving U.S.-Russia maritime boundaries and post-Cold War management regimes.

Shipping

Shipping in the Bering Sea is strongly seasonal and weather/ice constrained, but it is strategically important as the Pacific gateway to the Arctic via the Bering Strait. Major routes include: (1) North Pacific approaches into the Bering Sea that funnel toward the Bering Strait for Arctic transits (including traffic linking the North Pacific to Russia's Northern Sea Route during navigable seasons); (2) regional supply and freight routes serving western Alaska communities; and (3) fishing fleet logistics routes between fishing grounds and processing hubs. Key ports and maritime nodes include Dutch Harbor/Unalaska (one of the largest U.S. fishing ports and a major logistics hub), Nome (important for regional resupply and increasingly discussed as an Arctic-facing port), and smaller Alaskan ports/harbors such as St. Paul and St. George (Pribilofs) for local support. On the Russian side, maritime support is tied to the Chukotka and Kamchatka coasts (with larger Kamchatka ports often serving as gateways for fleets operating farther afield). Shipping risks and constraints include sea ice, fog, storms, limited aids to navigation, and sparse search-and-rescue coverage compared to lower latitudes.

Fishing

Commercial Fishing

The Bering Sea supports some of the world's most valuable high-latitude fisheries, dominated by industrial-scale trawl and longline fleets and extensive shoreside and at-sea processing. Management is highly structured (notably on the U.S. side) with quotas, observer coverage, bycatch controls, and seasonal/area closures, including measures related to protected species interactions. Commercial activity concentrates on the broad continental shelf and slope where productivity is high due to mixing, nutrient supply, and shelf-break processes; seasonal sea-ice dynamics strongly influence timing and distribution.

Artisanal Fishing

Coastal Indigenous and local communities in Alaska and Chukotka rely on small-boat and nearshore harvests for subsistence and local markets, with strong cultural ties and seasonal patterns. Artisanal/small-scale activities commonly include nearshore salmon fishing, set nets and small gillnet operations where permitted, small longline/handline fisheries, and harvesting of marine mammals and invertebrates under applicable regulations and customary practices. Community-based processing, sharing networks, and mixed cash-subsistence economies are central features.

Major Species
Walleye pollock Pacific cod Pacific halibut Alaska (snow) crab King crab (e.g., Bristol Bay red king crab) Pacific salmon (various species depending on river systems and coastal areas) Sablefish (black cod) on the slope Scallops (localized) Pacific herring (localized/seasonal)

Diving

Diving is challenging and best suited to experienced cold-water divers: near-freezing temperatures much of the year, strong currents and tidal exchanges in passes, frequent low visibility from plankton blooms and sediment resuspension, and rapid weather changes (fog, swell, storms). Seasonal sea ice and limited emergency infrastructure increase risk and planning requirements; drysuits, redundant gas, and conservative profiles are typical.

  • Aleutian Island passes and nearshore reefs (kelp forests, pinnacles, current-swept habitats)
  • Unalaska/Dutch Harbor area cold-water wreck and harbor dives (site specifics vary and are weather/permission dependent)
  • Pribilof Islands vicinity (noted more for wildlife viewing; limited, demanding dive opportunities)

Tourism

Tourism is niche but notable, shaped by remoteness, wildlife abundance, and cultural interest. Key activities include wildlife viewing (seabird colonies, whales, seals/sea lions), eco-cruises and expedition cruising (often linking the Aleutians, Pribilofs, and sometimes onward toward the Arctic), sport fishing in accessible coastal areas and river-connected systems, and cultural tourism centered on Yupik, Inupiat, Aleut, and Chukchi heritage (museums, festivals, community visits where appropriate). Common destination nodes include Dutch Harbor/Unalaska as a logistics gateway, the Pribilof Islands for seabirds and marine mammals, and coastal western Alaska communities as access points for guided nature and cultural experiences (season and weather dependent).

Oil & Gas

Hydrocarbon potential has been explored historically, but the Bering Sea's oil and gas development is constrained by harsh operating conditions, ecological sensitivity, and regulatory and social scrutiny. Some areas have seen past leasing interest and exploratory activity, while other zones have faced moratoria or heightened restrictions at various times. Offshore development-where proposed-must contend with sea ice, extreme storms, limited spill response capacity, and the high ecological and subsistence importance of marine resources; as a result, large-scale production has been more limited compared with other basins.

Military Presence

The Bering Sea is strategically significant as a frontier between the United States and Russia and as the maritime gateway between the Pacific and Arctic Oceans. During the Cold War it was a key region for surveillance, air and maritime patrols, and early warning considerations; strategic relevance continues due to Arctic access, submarine and air routes, and increasing seasonal shipping. Presence includes coast guard and naval operations focused on sovereignty, domain awareness, search and rescue, and enforcement (particularly fisheries enforcement and maritime safety). The proximity of Alaska and Russia's Far East makes the region sensitive to geopolitical shifts and heightened monitoring.

Bordering Cultures

Bordering cultures are predominantly Indigenous and coastal communities with deep maritime lifeways. On the Alaska side, this includes Yupik (especially along the Yukon-Kuskokwim Delta and Bristol Bay region), Inupiat communities closer to the Bering Strait, and Aleut communities across the Aleutian and Pribilof regions. On the Russian side, Chukchi and Yupik (Siberian Yupik) communities are prominent in Chukotka, alongside other Far Eastern coastal populations. Shared cultural elements include sea-ice knowledge, marine mammal and fish-based subsistence, boatbuilding and navigation traditions, seasonal camps, and cross-strait kinship ties historically present in the Bering Strait region (subject to modern border controls).

Did You Know?

Fun Facts

Superlatives

  • One of the world's most productive high-latitude seas: the broad, shallow eastern Bering shelf fuels enormous seasonal phytoplankton blooms that underpin major global fisheries.
  • Home to some of the planet's largest wild pollock harvests: the eastern Bering Sea walleye pollock fishery has often ranked among the biggest single-species fisheries by volume.
  • A "giant shelf sea": the eastern Bering Sea continental shelf is one of the widest on Earth, creating vast shallow-water habitat compared with many other marginal seas.
  • A key global seabird hotspot: in peak seasons, the Bering Sea and Aleutian region support extremely large seabird colonies and dense foraging aggregations (murres, auklets, kittiwakes).

Surprising Facts

  • Sea ice can boost productivity: melting ice helps create a stable, fresh surface layer and delivers ice-associated algae, sometimes jump-starting food webs earlier than open water alone.
  • The coldest water isn't always where you expect: the "cold pool" (near-bottom water left behind after winter ice) can persist into summer on the shelf, shaping where fish and crabs can live even when the surface warms.
  • A lot of the action is on the seafloor: in parts of the Bering shelf, energy flow can be strongly benthic (to clams, worms, crabs) rather than staying mostly in open-water food chains.
  • Not all "warming" means less ice immediately: year-to-year ice extent depends heavily on winds and winter weather patterns, so cold, icy years can still occur amid long-term warming trends.

Comparisons

  • Think of it as an oceanic "factory floor": its wide shallow shelf is like an enormous workbench where nutrients are repeatedly mixed and recycled, unlike steep-walled seas where nutrients quickly sink out of reach.
  • The Bering Strait is a narrow gateway compared with the seas it connects: it's a relatively small "valve" between the Pacific and Arctic, yet it controls a major flow of water, heat, nutrients, and organisms northward.
  • Sea-ice season acts like a giant seasonal switch: winter ice cover and spring melt function like turning on/off different production modes-ice-edge blooms vs. open-water blooms-similar to changing gears in an engine.
  • The shelf break is a biological 'edge effect': like a coastline for the deep sea, the shelf break concentrates currents and prey, drawing whales, seabirds, and fish to predictable feeding corridors.

Unusual Phenomena

  • The "cold pool": a broad lens of near-bottom, very cold water that lingers over the shelf after sea-ice retreat, forming a temperature barrier that can separate ecosystems and shift species distributions.
  • Ice-edge blooms: intense phytoplankton blooms often form along the retreating ice margin, creating a moving band of high productivity that predators can track.
  • Polynyas and coastal leads: recurring areas of open water within sea ice (driven by winds/currents) can become winter oases for marine mammals and birds-and strong sources of new sea ice.
  • Mass wildlife aggregations: seasonal pulses of plankton and forage fish can create spectacular, localized gatherings of feeding whales, seabirds, and pinnipeds along fronts and canyons.

Historical Facts

  • It's named after Vitus Bering, the Danish-born navigator in Russian service whose 18th-century expeditions helped map the region and confirmed the separation of Asia and North America.
  • The Bering Sea was a critical region in Cold War geography: its proximity made it strategically important for aviation, naval operations, and surveillance between the U.S. and Soviet Union.
  • Indigenous peoples have long depended on its marine resources: coastal communities in Alaska and Russia developed sophisticated knowledge and technology for hunting and fishing in ice-influenced seas.
  • Major fisheries development surged in the 20th century: industrial-scale harvesting and subsequent management reforms made the Bering Sea a central case study in modern fisheries science and regulation.

Cultural References

  • 'Deadliest Catch' made the Bering Sea famous worldwide by spotlighting dangerous crab fishing conditions and the region's stormy reputation.
  • Frequently referenced in documentaries about Arctic change: the Bering Sea is a recurring setting for films/series on sea ice, marine mammals, and climate-driven ecosystem shifts.
  • A touchstone in Alaska coastal identity: Bering Sea storms, ice, and fishing culture show up in Alaskan storytelling, local media, and community festivals tied to the marine harvest season.
  • Often invoked in popular science writing as a gateway sea: it's commonly described as the Pacific's 'doorway' to the Arctic, emphasizing its outsized role in high-latitude ocean circulation and ecology.

Animals Found in the Bering Sea

134 species documented in our encyclopedia

Alaskan Pollock Albatross Goose Anglerfish Arctic Char Bald Eagle Baleen Whale Barnacle Barreleye Fish (Barrel Eye) Bass Bear Belted Kingfisher Bird Blue Whale Bluefin Tuna Sixgill shark Bowhead Whale Chimaera Chinook Salmon King Salmon Chiton Keta Salmon Cockle Codfish Comb Jellyfish Common Goldeneye Common Loon Minke Whale Coral Cormorant Crab Decorator Crab Desmostylus Diving Duck Dolphin Duck Dungeness Crab Eagle Fur Seal Eelpout Eel Eider Elephant Seal Emperor Goose Feather Star Fin Whale Flounder Goby Fish Great Blue Heron Seagull Hagfish Halibut Harbor Porpoise Harbor Seal Hawk Hermit Crab Heron Herring Horned Grebe Humpback Whale Jellyfish Kelp Greenling Killer Whale King Crab King Eider Krill Lamprey Leatherback Sea Turtle Leech Limpet Lion's Mane Jellyfish Merganser Mollusk No See Ums Northern Fur Seal Nudibranch Oarfish Octopus Osprey Ostracod Otter Oyster Ocean Perch Pacific Sleeper Shark Pelagornithidae Pelican Pink Salmon Plesiosaur Polar Bear Pollock Sandworm Prawn Puffin Fish Rockfish Ruddy Turnstone Salmon Salmon Shark Sandpiper Sardines Scallops Sculpin Sea Anemone Sea Eagle Sea Lion Sea Otter Sea Slug Sea Spider Sea Squirt Sea Urchin Sei Whale Shark Shrimp Skate Fish Skua Sleeper Shark Snail Snailfish Snow Crab Sockeye Salmon Sperm Whale Sponge Squid Starfish Steelhead Salmon Steller's Sea Cow Sturgeon Swan Trout Seal Walrus Whimbrel Wolf Eel Wolffish

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