Various species of fishes deviate from the fusiform body shape in three ways: compression, depression, and elongation. A few types of fish can swim in both salt and fresh water. The general colouring of the fish depends on the colour of the water. Catch quotas have been introduced to save some of the most important species. This characteristic fusiform shape is quite energy efficient for swimming. Some of them stay and protect their eggs until they hatch. The sides of their body may have dark vertical bands. Get an answer for 'Describe the features of the following animals: fishes, amphibians, reptiles, birds and mammals.' From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world. Most fish eat meat, preferably other fish. What We Think. Table 4.7. It is currently believed that fish began to evolve about 480 million years ago. Their size can reach a length close to 20 cm, although in captivity hardly exceed 10. and find homework help for other Science questions at eNotes Salmon cover their eggs with sand and gravel. Physical Characteristics. When male betta's are threatened they have what is called a "beard" that puffs up (females do not have this). Longevity. Water is constantly pumped over the gills, which filter the oxygen out of the water and directly into the fish’s blood. Fish may or may not have teeth, depending on the species. In some species, for example sharks and salmon, it is highly developed. This fish is largely liked by the people of Bangladesh, and in Northern India. The general structure of the mammalian characteristic are: Fish spend a lot of precious periods in the water. The distinguishing feature of this fish is the large, fluid-filled sack which forms on each side of the face, directly underneath the eye of the fish. 4. Some fish also have big eyes, or whiskers. Many fish have excellent vision and can see colors. Over millions of years fish have changed their features and adapted to their surroundings in order to survive. Most species have a skeleton made of bone, only a few species have backbones made of cartilage. Some of them live in the clear water of rivers while others prefer muddy pond water. Many fish have scales and use their fins to swim. A similar arrangement of collagen fibres has been discovered in dolphins and squid. Bony fish also have unique ear plates called otoliths that help their sense of equilibrium and, when fossilized, provide scientists with lots of information about extinct bony fish species. Fish have lived on Earth for more than 450 million years. If the fish migrate to an area where the water is a different colour, they quickly adapt to the prevailing colour. Sample Sidebar Text. Fish are important to people. New ones are discovered every year. 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