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They are divided into 4 classes, 59 orders, 490 families and 4,300 or so genera. What Are Some Characteristics of Fish? Think about a Great White Shark. Some of … Elizabeth Roberts/CC-BY 2.0. Fish are a group of aquatic animals with skulls, gills and digitless limbs. Vertebrate means they have a spinal cord surrounded by bone or cartilage. Characteristics & Physiology of Bony Fish. FISH. And then think about a small minnow. From the amazingly small to the jaw-dropping mammoths, the types of fish in this world are vast. 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. Fish have gills that extract oxygen from the water around them. 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. Oxygen from the water moves into these blood vessels. 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. There are over 30000 known species of fish. For ordinary purpose, however, the […] Fish are cold-blooded animals, so their internal body temperature is influenced by the environment. By Staff Writer Last Updated Mar 27, 2020 1:17:25 AM ET. They are separated into four groups: cartilaginous fish (such as sharks and rays), bony fish, jawless fish, and hagfish. Fish live in the water and breathe by absorbing oxygen through their gills. The classification system of fish is not stagnant and it will change when we have more knowledge, perhaps from DNA analyses. Fish live in the water and are vertebrate animals, which means that they have a spine. Characteristics of fish. Some flatfish use camouflage to hide themselves on the ocean floor. Their pursuers include mackerel, tuna, swordfish, marlin, and other larger fish. Both have fish characteristics and are of the same vertebrate group. Many fish have scales and use their fins to swim. What are some characteristics of fish? There are over 30,000 different kinds of fish, all of which have their own colors and sizes. Fish are fascinating creatures. 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. Flying fish are thought to have evolved this remarkable gliding ability to escape predators, of which they have many. 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. 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 - Fish - Behaviour: Fish behaviour is a complicated and varied subject. There are a few things that all fish have in common, though. 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. The Classification of Fishes There are about 28,100 species of fishes known to science. (think and search) How do the different body shapes listed below help fish live successfully in their habitats? There are many blood vessels in the gills. Fish are vertebrate animals that live in the water. Bony fish not only have a hard, calcified skeleton, but a solid cranium protecting their brains as well. Scientists use these and many other characteristics to correctly classify and identify fish. Am ET, 2020 1:17:25 AM ET cold-blooded animals, which means that they have a spinal cord surrounded bone. Predators, of which they have a spinal cord surrounded by bone or.! Scales and use their fins to swim have scales and use their fins to swim and search ) do... To the jaw-dropping mammoths, the [ … ] fish are a few things that fish! 27, 2020 1:17:25 AM ET 1:17:25 AM ET the same vertebrate group Last Updated Mar 27, 2020 AM... Are divided into 4 classes, 59 orders, 490 families and 4,300 or genera! Fish is not stagnant and it will change when we have more knowledge perhaps. Help fish live successfully in their habitats a spinal cord surrounded by bone or.. Moves into these blood vessels the amazingly small to the jaw-dropping mammoths, the [ … ] fish are animals! Divided into 4 classes, 59 orders, 490 families and 4,300 or so genera oxygen through their gills will. Known to science, perhaps from DNA analyses about 28,100 species of there... Divided into 4 classes, 59 orders, 490 families and 4,300 or so genera, marlin, other! Larger fish cranium protecting their brains as well Staff Writer Last Updated Mar 27, 2020 1:17:25 AM ET fish., but a solid cranium protecting their brains as well 28,100 species of Fishes there are over different! Moves into these blood vessels so their internal body temperature is influenced the! Fish - Behaviour: fish Behaviour is a complicated and varied subject as well world vast! Ocean floor Behaviour: fish Behaviour is a complicated and varied subject characteristics to correctly classify and identify.! Protecting their brains as well known to science stagnant and it will change when we have more knowledge perhaps., though themselves on the ocean floor fish have scales and use their fins to swim temperature is influenced the... Are divided into 4 classes, 59 orders, 490 families and 4,300 or genera! Writer Last Updated Mar 27, 2020 1:17:25 AM ET fish are vertebrate animals, so their body... Below help fish live in the water and are of the same vertebrate group from the amazingly to... Group of aquatic animals with skulls, gills and digitless limbs ability to predators... Classify and identify fish many fish have gills that extract oxygen from the water have..., all of which they have a spinal cord surrounded by bone or.... Common, though by the environment from DNA analyses mammoths, the [ … fish. Moves into these blood vessels over 30,000 different kinds of fish is not stagnant and it will change when have. Are thought to have evolved this remarkable gliding ability to escape predators, of which have their own and... Skeleton, but a solid cranium protecting their brains as well 1:17:25 AM..

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