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The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]
It is often confused with the West African ladyfish, Elops lacerta, and can be distinguished only by the number of gill rakers on the lower part of the first gill arch, and the number of scales on the lateral line. [1] The Senegalese ladyfish grows to a maximum total length of 90 cm and a maximum weight of 5.9 kg. [1]
The West African ladyfish (Elops lacerate) is a species of ray-finned fish in the family Elopidae. It is native to the coastal waters of the eastern Atlantic Ocean, from Senegal to Angola. It is also known as the Guinean ladyfish. Some have been known to grow to 20 lb (9.1 kg). [3]
He landed a 21.75-inch sheepshead, 22.75-inch black drum, 21.25-inch ladyfish, 21-inch spotted seatrout and a 14.88-inch sand seatrout. ... The fish was 38 inches and earned a Big Fish Award and a ...
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All but one species bury in the mud when the body of water they live in dries up, surviving up to two years until water returns. Bichir (Polypteridae): These 12 species are the only ray-finned fish to retain lungs. They are facultative air breathers, requiring access to surface air to breathe in poorly oxygenated water. [1]
Postero-ventrally, it is the tripus, the os suspensorium and the third rib that interact directly with the anterior chamber of the swim bladder. [ 1 ] The Weberian apparatus functions by transmitting auditory signals straight from the gas bladder , through the Weberian ossicles and then straight into the labyrinth structures of the inner ear .
Another important adaptation that aids breathing while out of water is their enlarged gill chambers, where they retain a bubble of air. These chambers close tightly when the fish is above water, due to a ventromedial valve of the gill slit, keeping the gills moist, and allowing them to function while exposed to air.