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Grounded fish1/13/2024 ![]() The flatfish then changes its habits, and camouflages itself by lying on the bottom of the ocean floor with both eyes facing upwards. But as the fish grows from the larval stage, one eye migrates to the other side of the body as a process of metamorphosis. When the fish hatches, one eye is located on each side of its head. The adult fish of many species have both eyes on one side of the head. Examples are flounder, sole, turbot, plaice, and halibut. Benthic fish which can bury themselves include dragonets, flatfish and stingrays.įlatfish are an order of ray-finned benthic fishes which lie flat on the ocean floor. They either lie-and-wait as ambush predators, at times covering themselves with sand or otherwise camouflaging themselves, or move actively over the bottom in search for food. Those bottom feeders with upward-pointing mouths, such as stargazers, tend to seize swimming prey.īenthic fish are denser than water, so they can rest on the sea floor. Also, many exhibit what is termed an "inferior" mouth, which means that the mouth is pointed downwards this is beneficial as their food is often below them in the substrate. The exception may be the flatfish, which are laterally depressed but lie on their sides. Most demersal fish exhibit a flat ventral region so as to more easily rest their body on the substrate. With demersal fish the sand is usually pumped out of the mouth through the gill slit. Īs with other bottom feeders, a mechanism to deal with substrate is often necessary. Benthic flatfish and benthopelagic cod on a shore – Jan van Kessel senior, 1626–1679ĭemersal fish can be divided into two main types: strictly benthic fish which can rest on the sea floor, and benthopelagic fish which can float in the water column just above the sea floor.īenthopelagic fish have neutral buoyancy, so they can float at depth without much effort, while strictly benthic fish are denser, with negative buoyancy so they can lie on the bottom without any effort. ![]()
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