The rock bass (Ambloplites rupestris) are small game fish that got their name from their preferred habitat of lakes and streams with rocky bottoms. Also called goggle-eye or red-eye because of their big, reddish eyes, rock perch, red eye and black perch, this species is known for its aggressive nature, especially during the reproduction season when they become more territorial.
As a carnivorous animal, the fish eats any smaller prey, including insects, crustaceans, fish and crayfish. If you are interested in fishing, here is more interesting information about the rock bass.
What is rock bass?
The fish is a freshwater fish native to east-central North America. This fish can be found in clear, vegetated and rocky lake margins and stream pools. Its favourite habitat is clear, cool to warm waters, with gravel or rocky bottoms and some vegetation.
The rock bass is also delicious and has been known to make great pets since it can be lively in an aquarium. They are also easy to catch due to their abundance and aggressiveness.
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Rock bass fish
The fish is not a bass but a member of the sunfish family. The biggest fish reportedly caught weighed about three pounds and was a little over one foot long. They often stay camouflaged in their environment to avoid predators and other threats. When faced with a threat, the rock bass fish make themselves look bigger by spreading their opercles (the plates protecting the gills) and opening their mouth wide.
Below is a piece of more detailed information about the rock bass fish.
Location
The fish can be mostly found in North America, particularly the St Lawrence River and Great Lakes system, the upper and middle Mississippi River basin, Québec and Saskatchewan in Canada. They can also be found in Missouri and Arkansas, south to the Savannah River and throughout the eastern U.S. from New York through Kentucky and Tennessee to the northern portions of Alabama, Georgia and Florida in the south.
According to Animal Diversity Web, the rock bass fish can also be found in Europe. They prefer similar habitats but avoid areas of fast-moving water.
Speed, size and lifespan
The rock bass fish are slow swimmers, despite being able to travel very far. However, they swim faster in spurts to escape predators.
Also, the rock bass fish are small, typically about six to eight inches and weighing less than a pound. They are known to live an average of about five to eight years in the wild. However, this depends on the level of predation, as well as the food supply in their environment. Captured rock bass fish can live as long as 18 years.
Habitat
As previously stated, the rock bass fish’s preferred habitat is clear, vegetated and rocky lake margins and stream pools. They can also be found near stone-armored shorelines and breakwaters. These are also known for travelling as far as 150 miles away from their place of birth in search of habitat and food.
Diet
Speaking of food, the rock bass fish is a heavy eater. An adult rock bass eats heavily, especially in the evening and early in the morning. These species are also carnivorous, eating smaller animals like insects, crustaceans and smaller fish and crayfish. The rock bass is also known to occasionally take food from the surface. As pets, they can be taught to eat pellets.
Reproduction
The rock bass is sexually matured at two or three years. During mating, the male holds the female while she enters the nest and joins him in his circular behaviour. Both then simultaneously release their sperm and eggs into the nest.
The female is known to produce plenty of eggs (as much as 5,000 to 11,000) during the spawning season, which occurs from April to early June in warm waters ranging from 12–15 °C (54–59 °F).
On the other hand, the male fish is highly protective of the eggs. They build nests and guard the eggs aggressively, raising them for a short time. Rock bass fish are also known to grow quickly.
How to identify a rock bass
A rock bass has distinguished characteristics. You can identify it by its red to orange eyes, large, terminal mouth, body colouring from golden brown to olive, with white to silver belly, and five to seven spines in the anal fin and 12 in the dorsal. It also has irregular small spots on each scale below the lateral line that form narrow bands.
Its colouring helps it camouflage to avoid predators.
