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Even among the fish there are great differences in colour, size and shape. The smallest fish, the goby, is only one and a half centimetres long while the largest fish, the whale shark, is over 15 metres long. The weight of fish can range from a few grams to about 900 kilograms. Most fish only live for a few months to a year. Although fish are so different, they have certain common features. All of them have special organs that help them to live in water. These special organs are fins and gills. The fins help the fish to swim in water. They also help the fish to steady and steer itself as it moves through the water. The gills are com-like structures on either side of its head. The fish breathes by swallowing water and passing the water over the gills. The gills absorb the oxygen from the water. The water then comes out of the openings on the sides of its head. These openings have covers, called gill covers, over them. Most fish also have air-bladders. These help the fish to float. All fish have a line on either side of their bodies.
即使是魚類，顏色，大小和形狀都存在很大的不同之處。最小的魚，蝦虎魚，只有1.5厘米長，而最大的魚，鯊魚，超過15米長。魚的重量可以從幾克到900千克。很多魚只能在幾個月到一年里生存。 雖然魚有很多不同之處，但他們也有共同的特征。所有的魚都有特別的器官來幫助它們在水里生活。這些特別的器官是鰭和鰓。 這些魚鰭能幫助魚在水里游泳。它們能幫助魚在水中更加穩(wěn)定和操縱自己。魚鰓在魚頭兩邊的其中一邊。魚通過魚鰓吞水和吸水來呼吸。魚鰓從水里吸入氧氣。然后水從頭部另外一邊出來。這些開口有遮蓋物，叫做鰓蓋。 很多魚都有空氣的囊狀物。這可以幫助魚漂浮在水面。所有的魚在它們的身體上都有一條線。 ——By lsy34