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