Perch Fish

Quick Take

• Hundreds of fish species carry the name 'perch,' but only three qualify as the real thing, and the distinction matters more than you'd think. See the true species →
• Perch start life as carnivores, but something shifts as they grow. That shift changes how you should think about catching them. How their diet evolves →
• There's a surprisingly strange way perch end up in lakes and rivers where they were never introduced, and the explanation involves birds. How perch spread naturally →
• As perch mature, their social behavior flips completely. Knowing when that happens is the key to finding the biggest fish. From schooling to solitary →

Perch are considered by many anglers to be some of the best freshwater game fish in the world. Worldwide, several hundred species go by the name, but only 3 belong within the perch genus. They belong to the order Perciformes, or ray-finned fish, to which they also lend their name. They are powerful swimmers, and several species are known to put up a fight.  

5 Perch Fish Facts

• They are closely related to well-known species, including walleye, ruffe, sauger, and darters. 
• The largest yellow perch ever caught weighed 4 pounds, 3 ounces, while the largest officially recognized European perch weighed 6 pounds, 6 ounces.
• This fish has a sweet, delicate taste that makes it prized by anglers in several regions. 
• Females can lay anywhere from 2,000 to 200,000 eggs in a single year. 
• The European species is the national fish of Finland. 

Classification and Scientific Name

All perch belong to the ray-finned fish order Perciformes, which contains 41% of all bony-fish species worldwide. The order takes its name from the Greek word perke, meaning “perch,” and the Latin word forma, meaning “shape.” Hence, all fish in the order Perciformes are “perch-like.” However, only the 200 species and 11 genera within the family Percidae belong to the category of “true perch.” Additionally, within this family, researchers distinguish the 3 species in the genus Perca as the model of this fish. These 3 species include the European perch or common perch (Perca fluviatilis), the yellow perch or American perch (Perca flavescens), and the Balkhash perch (Perca schrenkii). The European perch’s scientific name derives from the Latin word fluvius, meaning “river,” while the yellow perch’s scientific name comes from the Latin word flavescens for “yellow-colored” or “becoming gold.”  

Appearance 

Generally speaking, these fish all tend to look fairly similar, although a few variations in size and color exist. True perch are ray-finned fish with long, round bodies and rough scales. They have paired pectoral and pelvic fins as well as two dorsal fins. The dorsal fins can either grow separately or be joined, depending on the species. The first fin is spiny, while the second one is quite soft. 

European species appear greenish aside from their red pelvic, caudal, and anal fins. These red fins are why some people refer to the European perch as the redfin perch. It also sports eight dark vertical lines on its sides and a large hump between its head and dorsal fin. Meanwhile, the yellow perch appears primarily gold or yellow in color, as its name suggests. Like its European relative, it also sports dark vertical stripes on its sides. Finally, the Balkhash perch closely resembles the European and yellow versions, except that it appears longer and thinner with the dark vertical bars of its relatives. 

The European perch measures the largest among the 3 species, with an average weight between 1.5 and 3 pounds and a length of around 10 inches. That said, the longest specimen ever caught measured 24 inches long, while the heaviest officially recognized weighed 6 pounds, 6 ounces. Next up is the yellow perch, which averages between 4 and 11 inches and around 1 pound. However, some monstrous yellow perch can reach 20 inches long and weigh over 4 pounds. As for the Balkhash perch, the largest specimens reach up to 20 inches and just over 3 pounds.  

Behavior

As juveniles, they usually swim together in schools that can contain anywhere from a few dozen to a few hundred fish. However, as they mature, they tend to grow more independent. As a result, the most sought-after specimens typically live alone except when mating. Depending on the species, perch can put up a considerable fight when caught on a line, particularly the larger specimens. They prefer cooler, deeper water, but move to warmer, shallower water to feed or spawn. 

Distribution, Population, and Habitat

They are found all over the world, wherever freshwater exists. As its name implies, the European perch is native to Europe as well as parts of northern Asia. However, anglers have also introduced it to parts of Australia, South Africa, and New Zealand. Meanwhile, yellow perch are distributed throughout much of the United States and Canada and are particularly abundant in the Great Lakes. The Balkhash perch lives in a much more confined range compared to its relatives. It is endemic only to the Lake Balkhash and Lake Alakol watersheds, which reside predominantly in Kazakhstan. 

They inhabit various freshwater habitats, including rivers, lakes, streams, and ponds. While most species prefer slower-moving rivers, some will spend time in fast-moving waters. In addition, they tend to avoid especially cold or deep water where the light cannot penetrate. These fish are predominantly found in bodies of water that contain plenty of vegetation and debris, where they can find food and hide from predators. 

Predators and Prey

Several species prey on them, including other fish such as pike, trout, and bass. Some common predators of perch include birds of prey like ospreys, cormorants, kingfishers, eagles, herons, and pelicans. Other predators include marine mammals such as otters. 

Although primarily carnivorous when young, their dietary habits change as they mature, making it more accurate to classify them as omnivores. Young ones tend to feed mostly on zooplankton and small insects such as mosquitoes and midges. By the time they reach adulthood, their diet expands to include small crustaceans such as shrimp and crayfish, as well as other fish. Fish they commonly prey on include roaches, minnows, and sticklebacks. Occasionally, perch will also cannibalize their own young. Although juveniles are predominantly carnivorous, adults often eat algae and other freshwater vegetation.

While not nocturnal, most perch tend to feed around dawn or dusk. They prefer to actively hunt their prey, which is why many anglers use live bait. They rely on their keen eyesight to help them spot their prey.    

Reproduction and Life Cycle

Males sexually mature between 1 and 2 years old, while females sexually mature at around 3 to 4 years old. Perch spawn in the spring and deposit their eggs on aquatic plants. Some evidence also suggests that their eggs can stick to the legs of birds, which may contribute to their transfer to new regions. During a single year, a female can lay anywhere from 2,000 to 200,000 eggs, with larger females laying more eggs than smaller ones. In the wild, most tend to live between 5 and 8 years, while some can live up to 10 or 11 years. 

Fishing and Cooking

Each year, commercial fisheries and sport anglers catch millions of perch. While some species can put up quite a fight, they are still classified as relatively easy to catch with both live and artificial bait. They tend to swim in schools, so where there’s one, you’re likely to find more. Many anglers choose to use live bait and fish at dawn or dusk when perch are most active. In addition to using slip floats, swim baits, lures, and jigs, some fishers also catch them via spearfishing.

This fish has delicate, almost translucent flesh. While it possesses a crumbly texture, it holds up well when cooked. It doesn’t smell particularly fishy and, when cooked, tastes mildly sweet. You can prepare it in several ways, including steamed, roasted, braised, or fried. While you can eat it raw, you’ll want to prepare it properly before doing so.

Population

Perch are some of the most plentiful freshwater game fish in the world. They enjoy a relatively long lifespan, reach sexual maturity at a young age, and reproduce prolifically. In addition, their popularity as game fish ensures that perch are relatively protected from overfishing. Even though fishers harvest thousands of tons of them every year, many populations remain stable, though some — such as yellow perch in parts of Lake Erie — have experienced declines. Given this fact, the total perch population likely measures in the hundreds of millions or billions. That said, the Balkhash perch has suffered population declines in recent years, likely due to the introduction of rival predatory fish such as the bream and Volga pikeperch. Still, the IUCN lists all three species of true perch as species of Least Concern.