鱼类虽然都有其固定的食物范围,但并不是一成不变的。从它们的生态习性和自然环境变化两方面看,诸如鱼类自身的生长期的变化,水域饵料的丰歉,人工长期投喂饵料品种的变更等因素,它们会改变天然食性。有时鱼类为了谋求生存,在对口食物不丰富的条件下,不得不适应某种饵料。鱼类的食性改变,有 Although the fish have a fixed range of food, but it is not static. From their ecological habits and changes in the natural environment, such as changes in the growth of fish itself, water apology and apology, artificial long-term feeding changes in food species and other factors, they will change the natural diet. Sometimes fish in order to survive, in the non-food-rich conditions, had to adapt to a certain kind of food. Fish diet changes, there