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