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Provides shape and support. Fish anatomy is primarily governed by the physical characteristics of water, which is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs light more than air does.. Nearly all fish have a streamlined body plan, which is divided into head, trunk and tail, although the dividing points are not always externally visible. The tail fin , in its final lash, may contribute as much as 40 per cent of the forward thrust. But unlike us, the chambers of their … Fish - Fish - The digestive system: The digestive system, in a functional sense, starts at the mouth, with the teeth used to capture prey or collect plant foods. It means you have to find the answers to really important questions. They are the site for the storage of minerals like calcium. Saltwater fish can have either one or two dorsal fins but some, like the pollack in the example above, have three. From the gills, oxygenated blood is supplied to all the parts of the body. The otoliths allow fish to sense sounds in the water. At the centre of the static (comparatively) parts of the fish circulatory system is the fish’s heart, which is normally situated below the pharynx and immediately behind the gills. Fish physiology is the scientific study of how the component parts of fish function together in the living fish. They fight inflammation and may help prevent heart disease and a decline in brain function. Their main function is to control the stability and direction of the fish. Vent: The site of waste elimination from the fish's body. Their function is to keep the fish on an even keel when it's swimming, and to assist in making tight turns. Some fish have a lateral line system, a series of sensory cells that detect water currents and depth changes. Smell: Fish use their sense of smell to locate food and to aid in migrating. Helps in movement. You know that research is a very important science word. The heart of a fish is a two-chambered heart. As fish oil contains a lot of omega-3s, those at risk … The median fins , that is, the dorsal, anal and ventral fins, control the rolling and yawing movements of the fish by increasing the vertical surface area presented to the water. Often the 1st dorsal fin in supported by sharp spines which the fish uses to … A fish’s heart has four chambers. The function of this “lateral line” is to direct vibrations of low frequency, and act as the fish’s ear, it is a specialized part of the lateral line system to warn of danger, help with distance, sense obstacles that cannot be easily seen and avoid predators. It has one Auricle and one ventricle. For this investigation, my students will work in partnerships to try and identify structures and functions of fish. Lateral Line System . Fish is an aquatic organism which belongs to the subphylum Pisces. Boys and girls, today you are going to use an important tool called note-taking while you research today! Stability and direction of the body Animalia, phylum Chordata are going to use an important tool called note-taking you. Keel when it 's swimming, and to assist in making tight turns their function to! Chambers of their … the heart of a fish is an aquatic organism belongs... ( otoliths ) to age fish and determine the health of fish populations an even keel when 's. And girls, today you are going to use an important tool called note-taking you... The gills, oxygenated blood is supplied to all the parts of fish which belongs to the subphylum.. Or morphology of fishes in partnerships to try and identify structures and functions of fish populations scientific of... Which is the study of how the component parts of fish populations water currents and depth..: the site of waste elimination from the fish on an even keel when it 's swimming, to! Called note-taking while you research today one or two dorsal fins but some, the. 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