Fish are cold-blooded animals, so their internal body temperature is influenced by the environment. The General Structures and Characteristics of Fish Elementary Ó2003 7 Question Answer Relationship (continued) Identify a fish that is a bottom dweller, one that lives in the open sea and one that lives among coral reefs. Fish are fascinating creatures. There are a few things that all fish have in common, though. (think and search) How do the different body shapes listed below help fish live successfully in their habitats? There are over 30000 known species of fish. For ordinary purpose, however, the […] 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. There are over 30,000 different kinds of fish, all of which have their own colors and sizes. Fish have gills that extract oxygen from the water around them. And then think about a small minnow. What Are Some Characteristics of Fish? Oxygen from the water moves into these blood vessels. Some of … Fish live in the water and are vertebrate animals, which means that they have a spine. Some flatfish use camouflage to hide themselves on the ocean floor. 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. Characteristics & Physiology of Bony Fish. The classification system of fish is not stagnant and it will change when we have more knowledge, perhaps from DNA analyses. Elizabeth Roberts/CC-BY 2.0. From the amazingly small to the jaw-dropping mammoths, the types of fish in this world are vast. What are some characteristics of fish? By Staff Writer Last Updated Mar 27, 2020 1:17:25 AM ET. 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. Fish live in the water and breathe by absorbing oxygen through their gills. Characteristics of fish. Their pursuers include mackerel, tuna, swordfish, marlin, and other larger fish. Scientists use these and many other characteristics to correctly classify and identify fish. 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 vertebrate animals that live in the water. Flying fish are thought to have evolved this remarkable gliding ability to escape predators, of which they have many. They are divided into 4 classes, 59 orders, 490 families and 4,300 or so genera. The Classification of Fishes There are about 28,100 species of fishes known to science. There are many blood vessels in the gills. Fish are a group of aquatic animals with skulls, gills and digitless limbs. Think about a Great White Shark. They are separated into four groups: cartilaginous fish (such as sharks and rays), bony fish, jawless fish, and hagfish. Both have fish characteristics and are of the same vertebrate group. Many fish have scales and use their fins to swim. 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. 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