Fish is a kind of vertebrate living in water. Its gills will not change like amphibians. In its life, most of them are cold-blooded.
Although some fish (such as some species of tuna and shark) are warm-blooded, there are more than species of fish, which makes them the most diverse vertebrate in taxonomy. Fish is a parazoon group, and its exact relationship Controversial. A common classification is the javelin fishes (the class anodontida, which includes lampreys and lampreys) cartilaginous fishes (cartilaginous fishes, including sharks and rays), and the rest are classified as teleosts (teleosts vary in size from (feet) whale sharks to stout baby fish one millimetre (just over a quarter of an inch) long.
Many species of aquatic animals are called Because xxxfishxxx is not a real fish, and in the case of jellyfish, cuttlefish and other animals, not even vertebrates, other marine organisms in the past were considered to be fish, such as dolphins, in fact, mammals. Although most fish are aquatic and cold-blooded, there are exceptions to both situations. Many different species of fish have evolved the ability to live underwater for a long time Some of these amphibious fishes, such as Misgurnus anguillicaudatus, can also live and move on land for a few days.
Some species of heat absorbing teleost (teleostichthys) belong to the scombroidei suborder, including flounder, tuna and a xxxprimitivexxx mackerel (gasterochisma) All the sharks of melampus belong to the Lamnidae family - brachypterus bracteatus, Scomber Longfin, white shark, malachite, salmon shark - known for their ability to absorb heat, and there is evidence that this characteristic exists in the aloe family (threshing sharks). The degree of heat absorption is different from that of baleen whales. The latter only warms the eyes and brain.
For bluefin tuna and rat shark, their body temperature is kept above the ambient water temperature. It can also be seen that giant heat absorption has the advantages of enhancing muscle contraction and improving the processing speed of central nervous system. In many cultures, fish are An important source of food.
Other aquatic animals, such as molluscs, crustaceans and shellfish, are often referred to as xxxfishxxx when used as food. For details, see fish.
中文翻译：
鱼是一种生活在水里的脊椎动物，它的鳃不会像两栖动物那样发生变化，在它的一生中，大多数是冷血的，尽管有些鱼类（如金枪鱼和鲨鱼的一些物种）是温血的，但有超过种的鱼，使它们在分类学上是最多样化的脊椎动物，鱼类是一个副动物类群，其确切的关系备受争议。一个常见的分类是无颚鱼（无颚鱼纲，包括七鳃鳗和七鳃鳗的种类）软骨鱼（软骨鱼类纲，包括鲨鱼和鳐鱼在内的物种，其余的被归类为硬骨鱼（硬骨鱼类有不同的大小，从（英尺）鲸鲨到一毫米（略超过四分之一英寸）长的粗壮的婴儿鱼许多种类的水生动物被称为"鱼"不是真正的鱼，而且在水母和墨鱼等动物的例子中，甚至不是脊椎动物其他海洋生物在过去被认为是鱼，如海豚，实际上是哺乳动物，尽管大多数鱼类都是水生和冷血鱼类，但这两种情况都有例外，许多不同种类的鱼类已经进化出在水下长时间生活的能力，这些两栖鱼类中的一些，如泥鳅，也可以在陆地上生活和移动几天，某些种类的鱼在不同程度上保持体温升高吸热硬骨鱼（硬骨鱼）都属于Scombroidei亚目，包括比目鱼、金枪鱼和一种"原始"鲭鱼（Gasterochisma melampus所有的鲨鱼都属于Lamnidae科-短鳍卷尾鱼、长鳍鲭鲨、白鲨、孔雀鱼，鲑鱼鲨-众所周知有吸热的能力，有证据表明，这种特性存在于芦荟科（脱粒鲨）中。吸热程度不同于长须鲸，后者只会温暖眼睛和大脑，对于蓝鳍金枪鱼和鼠比格鲨来说，它们的体温保持在高于环境水温的摄氏度以上，也可以看到巨热吸热虽然代谢代价高昂，但被认为具有增强肌肉收缩力、提高中枢神经系统处理速度等优点，在许多文化中，鱼是重要的食物来源。
其他水栖动物，如软体动物、甲壳类动物和贝类，在用作食物时通常被称为"鱼"，详情请参见fish（食物。
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