Ozark Bass

Quick Take

• The Ozark bass was long mistaken for a completely different species, and the reason scientists finally told them apart is stranger than you'd expect. How scientists told them apart →
• When it comes to nesting, Ozark bass flip the script on what most people assume about fish parenting. See the nesting details →
• One fishing method consistently outperforms boats and kayaks for catching Ozark bass, yet most anglers overlook it. Discover the best method →
• Scientists still can't answer some of the most basic questions about this fish, and that knowledge gap has real consequences for its survival. Explore the knowledge gaps →

Native to White River tributaries in Arkansas and Missouri, Ozark bass populations do not extend far beyond this region. This species is unique in that it cannot be found anywhere else in the United States. Their concentrated population has not deterred fishing, though. In fact, fishing for Ozark bass is popular and enjoyable in the White River region. This species comes in all shapes, sizes, and variations, ranging from 3.5 ounces to one pound in weight. Therefore, catching this fish will always lead to a surprise. Furthermore, this bass, also known as “goggle-eye,” has large red eyes, giving it a unique appearance.

8 Ozark Bass Facts

• The largest Ozark bass ever caught weighed one pound, which is over 12 ounces greater than their average weight!
• They were originally thought to be the same species as the redeye bass.
• Very little is known about this fish, including population numbers, mating patterns, and natural predators.
• Their favorite food is crayfish.
• Threats to Ozark bass include habitat loss, water contamination, gravel mining, illness, lack of food, and varying water levels and temperatures due to climate change.
• They can live up to nine years.
• Males build and guard the nests, rather than females.
• Ozark bass prefer plentiful amounts of shade and cool water temperatures.

Classification and Scientific Name

The scientific name of the Ozark bass is Ambloplites constellatus. However, people who live near their habitat refer to this species as “goggle-eye.” This bass belongs to the Centrarchidae, or sunfish, family and the Centrarchiformes order. It was classified as its own species when researchers distinguished it from the redeye bass, whose scientific name is Micropterus coosae. Previously, many researchers assumed that these two species were the same. The term Ambloplites comes from the Greek words ambloo, meaning blunt, and oplites, meaning shield.

Appearance

Ozark bass have a maximum length of 10.98 inches and an average length of 5.24 inches. It takes approximately five years for this fish to achieve 8 inches in length. The maximum reported weight of an Ozark bass is one pound. The average female length measured 6.50 inches when recorded by researchers in the Buffalo River region, and the average male length in the same area measured 6.65 inches. Weights recorded at the Buffalo River averaged 3.69 ounces for female bass and 3.88 ounces for males. These figures follow the same trends as those recorded at Crooked Creek on the White River.

The Ozark bass is a slimmer kind of rock bass. Its eyes are large and red, which is likely why it was previously confused with the redeye bass. Its body coloration is a mix of brown and green shades and includes numerous small black specks, which are randomly distributed across the body.

Distribution, Population, and Habitat

Populations are extremely concentrated. In fact, they can only be found in the upper portion of the White River drainage in Missouri and Arkansas in the United States. While efforts have been made to create populations of them in other areas, these efforts have not proved successful.

These bass can be encountered in creeks, streams, and small to medium-sized rivers. They prefer waters with increased dissolved oxygen levels, little to no turbidity, and an abundance of plant species. They enjoy being near rocks, wood, or brush and alongside the banks of a river or stream.

Unfortunately, there are very few estimates of Ozark bass present in the White River region. Therefore, a general population count has not been recorded. However, some studies have recorded an average catch per unit effort (CPUE) in portions of the White River, such as Buffalo River or Crooked Creek. A CPUE does not estimate population, but it does estimate changes in abundance. The average CPUE at Buffalo River and Crooked Creek was 32.9 and 101.5 fish per hour, respectively. While these figures do not help to account for population, they can aid in understanding conservation. A decreasing CPUE in a given area can indicate that a species is threatened, as it signals declining fish abundance. On the contrary, a CPUE that does not change means that fish numbers are not threatened.

Predators and Prey

The Ozark bass diet consists of crayfish, insects, and minnows. While specific predators are largely unidentified, predators that target related fish are snakes, herons, turtles, and other larger fish species. Other threats to them include a lack of food, illness, and habitat loss.

Conservation Status

They are deemed to be of least concern. Nevertheless, some factors still threaten the Ozark bass. For example, karst geology in the White River drainage area can cause the water to become contaminated more easily than water in areas that do not have karst geology. Therefore, this contamination could threaten the already highly condensed population of the Ozark bass.

Furthermore, anthropogenic activities such as gravel mining and increased recreational use of White River tributaries can disrupt habitats and contribute to water contamination. According to climate change predictions and consequences, this fish may become threatened by invasive species and varying water levels due to excess or deficient precipitation.

Reproduction and Lifespan

Males, rather than females, will build a nest for young in gravel or between small rocks. Nests measure between 7.87 inches and 9.84 inches, and they sit at a depth ranging from 11.81 inches to 59.06 inches. When water temperatures measure approximately 62ºF to 63ºF, females will lay eggs in the nest. Males will watch over the eggs until they hatch and grow old enough to depart. Ozark bass may live up to nine years.

Fishing

The best time to look for bass in the Ozarks area is between March and June. One can encounter them in streams that are characterized by clear water, low turbidity, abundant vegetation, and cool temperatures. They will likely be swimming along the bottom of the stream near boulders or brush. When fishing for Ozark bass, be sure to ask permission if doing so on private property. Otherwise, public areas, which are owned by the state or federal government, are available for fishing.

A person can fish in a variety of ways. Boats, kayaks, and canoes can be used on the river for transportation and fishing. Wade fishing in streams, in many instances, results in larger catches. Many different types of bait can be used, but darker-colored bait will likely produce the best results. Fishing methods are relatively varied for those looking to catch an Ozark bass. Below are some successful bass fishing methods: 

• Pole and line
• Fly casting
• Spin casting
• Bait casting