在全世界现有的鱼中，绝大多数鱼是冷血的。究其原因，是因鱼在水中保持体温相当困难，且它们用鳃在水中吸氧时，也需要消耗许多热量。然而，还有数十种鱼是热血的。 多年来，研究人员对此有两种观点，一种认为热血鱼可以游到更冷的区域，因而扩张了其捕猎的范围，即扩大了它的 The vast majority of fish present in the world are cold-blooded. The reason for this is that it is quite difficult for fish to maintain body temperature in water, and they also consume a lot of heat when they use oxygen in the gills. However, dozens of other species of fish are also warm-blooded. Over the years, researchers have two views on this, one that hot blood fish can swim to the colder area, thus expanding the scope of its hunting, which expanded its