ocr: BONY FISH Mackerel A mackerel has a typical Dorsal fin Pectoral fin bonyfish shape and. structure. Tail fin Anal fin Pelvic fin Operculum Mostad FISH belong to a group called scales. body Although plan, all bony there are fish the bony fish. They have share a similar a bony, flexible skeleton, and a swim manyinteresting forms. Eels are long bladder filled with gas to help them and look more like snakes than fish. move up and down in the water. Seahorses and many deep-sea fish Their gills, which enable them to also look very unusual. Many fish breathe in water, are protected bya are camouflaged ...