必须区别发育和生长两个概念,在这里“发育”是指卵割、胚体形成、各种器官的分化、发达、行动的产生和发达等。相对而言,所谓生长仅仅是指体长、体重等身体大小的增大。鱼类的发生初期发育和生长是同时、迅速进行。 Must distinguish between the two concepts of development and growth, where “development” refers to the oval cut, the formation of embryos, the differentiation of various organs, developed, action and developed. Relatively speaking, the so-called growth refers only to body length, weight and other body size increases. The early development and growth of fish occurs simultaneously and rapidly.