She serves as the executive director of the Fish batter without beer Ocean Society for Marine Conservation. Fish swim by flexing their bodies, forming waves of contractions along their muscles. These waves push water backward and move the fish forward. They may have one, two or even three dorsal fins.

Most fish have scales covered with a slimy mucus that helps protect them. Fish have gills for breathing – the fish inhales water through its mouth, which passes over the gills, where hemoglobin in the fish’s blood absorbs oxygen. Fish may also have a lateral line system, which detects movement in the water, and a swim bladder, which the fish uses for buoyancy. The fishes are divided into two superclasses: Gnathostomata, or vertebrates with jaws, and the Agnatha, or jawless fishes. Class Sarcopterygii, the lobe-finned fish, the coelacanth and lungfishes. With thousands of species, reproduction in fish can be remarkably different. There’s the seahorse – the only species in which the male gives birth.

And then there are species like cod, in which females release 3-9 million eggs into the water column. Some shark species are oviparous, meaning they lay eggs. Fish are distributed in a wide variety of habitats, both marine, and freshwater, throughout the world. Fish have even been found as deep as 4. 8 miles beneath the ocean surface. Sur cette version linguistique de Wikipédia, les liens interlangues sont placés en haut à droite du titre de l’article. Un article de Wikipédia, l’encyclopédie libre.