Description
The blackbanded sunfish is fairly small, maximum length of 10 cm, with an average life span of 3–4 years. The average length of this sunfish is around 6 centimeters. The blackbanded sunfish has a very compressed, deep body with a small mouth but big lower jaw extending upwards. Its gill cover has a black spot, and the dorsal (top), anal (back/bottom), and caudal (tail) fins are black-mottled. Its dorsal fin stands upright with 10 spines and the tail fin is somewhat rounded. The body coloration is mostly a shiny silver with yellow spots. The blackbanded sunfish gets its name from the six black vertical lines on each side, starting with the first line running through its eye and five more vertical lines back to the tail fin.
Sexual dimorphism
Generally the males are heavier and more colorful than the females. The males also are larger with longer fins, while the females become plumper when ripe with eggs.
Habitat
Blackbanded sunfish are found in the United States from New Jersey to central Florida. There are also reports that these fish are in the Delaware Valley, but there have not been any success in collecting fish from this area. Blackbanded sunfish are restricted to shallow, low-velocity, non-turbid waters of lakes, ponds, rivers and streams. They are strongly associated with aquatic plants, because it provides them with a habitat for foraging and cover. The fish population has been hurt over the past few years due to poor water conditions and pollution.
Diet
Blackbanded sunfish are carnivores. In most locations, midge larvae are the predominant food source for Black-banded sunfish. However they also consume a wide variety of zooplankton, aquatic insects, and crustaceans.
Behavior
The blackbanded sunfish is a peaceful, friendly fish that likes to group with others of the same species. They can, however, become aggressive and territorial when spawning.
Reproduction
Like other sunfish, male blackbanded sunfish stake out a nest site, normally among plants. Females lay their eggs in the nest, and then the males will drive them off. The males will guard their eggs until hatching and sometimes perhaps for a week after until the fry are free swimming.
Threats and protection needs
The blackbanded sunfish is critically imperiled and vulnerable in much of its range along the Atlantic. Some of its reasons of decline are because of drying of ponds and swamps as well as contamination of water by pesticides. Also, taking of blackbanded sunfish for aquariums poses a threat for their populations in Virginia.
Article text: Wikipedia contributors, Blackbanded sunfish (source revision). Licensed under CC BY-SA 4.0. Retrieved 2026-10-11.
