魚苗提出的問题能在池塘里生长的魚很多,但是适于广泛养殖、經济收益大的,主要有青魚、草魚、鰱魚和鱅魚四种。这是久經考驗的优良魚种,不但肥美可口,飼养也容易,因此人們管它們叫家魚。早在一千多年前的唐代,我国的劳动人民,就已經开始在池塘里养殖它們了。这四种魚有个怪脾气:在池塘里不管养它多久、多大,生殖腺不易成熟,即使成熟也不肯在池塘里产卵繁殖,只有江河才是它們出生的地方。因此,养殖它們首先要到江河中捕撈魚苗。这几种魚每年到了一定季节(长江流域在农历立 Problems raised by fish fry can produce a lot of fish in the pond, but it is suitable for a wide range of farming and economic benefits. There are mainly four kinds of herring, grass carp, carp, and carp. This is a time-tested and excellent fish species. It is not only plump and delicious, but also easy to raise. Therefore people call them home fish. As early as the Tang Dynasty more than a thousand years ago, the working people of our country began to breed them in ponds. These four kinds of fish have a strange temper: In the pond, no matter how long or how long it takes to keep it, the gonads are not easy to mature. Even if they are mature, they will not spawn in the pond. Only rivers are where they were born. Therefore, first of all, they must go to rivers to catch fry. These kinds of fish come to a certain season every year (Yangtze River Valley in the Lunar New Year