Taxonomy
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Pleuronectidae
- Genus
- Kareius
- Species
- bicoloratus
Habitat
Stone flounders primarily inhabit sandy or muddy bottoms in coastal waters of the Northwest Pacific, ranging from shallow estuaries to depths of about 100 meters. They prefer temperate regions around Japan, the Korean Peninsula, and northern China, where they can bury themselves in sediment for protection. This species tolerates varying salinities, often found in both marine and brackish environments.
Diet
Stone flounders are carnivorous, feeding mainly on small fish, crustaceans, and polychaete worms that they ambush from the sea floor. They use their flattened bodies to lie in wait and strike quickly at prey, with feeding activity peaking at night or during low-light conditions. Their diet varies seasonally based on availability in their habitat.
Behavior
Stone flounders are solitary and territorial, spending most of their time buried in sediment or lying flat on the bottom to avoid detection. They exhibit excellent camouflage by changing color to match their surroundings and are primarily nocturnal hunters. During spawning seasons, they may migrate to shallower waters, but otherwise remain sedentary.
Fishing
Target stone flounders with bottom fishing techniques using a medium-light rod and reel setup spooled with 10-20 lb test line, equipped with a weighted rig like a Carolina or fish finder setup to keep bait near the seafloor; effective baits and lures include live shrimp, worms, or small fish imitations such as soft plastics or jigs that mimic their natural prey like crustaceans and polychaetes. The best season is spring during spawning migrations to shallower waters, with optimal fishing times at dawn, dusk, or night when they are most active and feeding; focus on sandy or muddy bottoms in coastal temperate regions of the Northwest Pacific, including Japan, the Korean Peninsula, northern China, and areas around the Kuril Islands, at depths from shallow estuaries to about 100 meters. Stone flounders can reach record sizes, with the IGFA all-tackle world record at 7 pounds 10 ounces, showcasing their potential as a rewarding catch. Conservation efforts, supported by angler license fees and excise taxes, promote sustainable practices like slot limits and catch-and-release in certain areas to maintain stable populations, as this species is not evaluated by the IUCN but benefits from regulated fishing that funds habitat protection and stocking programs in these productive waterways.
Conservation Status
Listed as Not Evaluated by IUCN.