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There are over 30000 known species of fish. What Are Some Characteristics of Fish? Some common distinguishing characteristics of sharks, rays and their kin include the lack of the swim bladder found in many bony fishes; that males fertilize females internally; the possession of five to seven gill arches; and that their skin is composed of toothlike denticles that give the skin an abrasive texture. Flying fish are thought to have evolved this remarkable gliding ability to escape predators, of which they have many. There are a few things that all fish have in common, though. As in almost all animals with a central nervous system, the nature of a response of an individual fish to stimuli from its environment depends upon the inherited characteristics of its nervous system, on what it has learned from past experience, and on the nature of the stimuli. Many fish have scales and use their fins to swim. They are separated into four groups: cartilaginous fish (such as sharks and rays), bony fish, jawless fish, and hagfish. Fish are cold-blooded animals, so their internal body temperature is influenced by the environment. Living in water presents a number of problems such as maintaining salt concentrations and neutral buoyancy and this group of animals has evolved a number of ways to deal with these issues. Elizabeth Roberts/CC-BY 2.0. Fish are a group of aquatic animals with skulls, gills and digitless limbs. FISH. Oxygen from the water moves into these blood vessels. Vertebrate means they have a spinal cord surrounded by bone or cartilage. Fish have gills that extract oxygen from the water around them. Common characteristics of fish in the classes Chondrichthyes and Osteichthyes Efficient respiratory system, closed circulatory system, sexual reproduction, paired fins, developed sensory systems, presence of scales, presence of a jaw, presence of an endoskelaton. Fish are fascinating creatures. Their pursuers include mackerel, tuna, swordfish, marlin, and other larger fish. The classification system of fish is not stagnant and it will change when we have more knowledge, perhaps from DNA analyses. Bony fish not only have a hard, calcified skeleton, but a solid cranium protecting their brains as well. (think and search) How do the different body shapes listed below help fish live successfully in their habitats? Fish live in the water and breathe by absorbing oxygen through their gills. Some flatfish use camouflage to hide themselves on the ocean floor. From the amazingly small to the jaw-dropping mammoths, the types of fish in this world are vast. There are over 30,000 different kinds of fish, all of which have their own colors and sizes. Some of … Generic fish Graphic: characteristics of fish pectoral fin dorsal fins anal fin pelvic fin barbels snout caudal (tail) fin adipose fin mouth This graphic is a composite illustration that shows a variety of distinguishing characteristics. Characteristics of fish. The Classification of Fishes There are about 28,100 species of fishes known to science. Scientists use these and many other characteristics to correctly classify and identify fish. Gills - Water goes into the fish's mouth and then over their gills (which are made up of rows of gill filaments) before leaving the fish out of the gill slits. And then think about a small minnow. They are divided into 4 classes, 59 orders, 490 families and 4,300 or so genera. Both have fish characteristics and are of the same vertebrate group. For ordinary purpose, however, the […] Characteristics & Physiology of Bony Fish. Fish live in the water and are vertebrate animals, which means that they have a spine. 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