《农桑辑要·禽鱼·鱼》
还有一个作鱼池的方法：三尺长的大鲤鱼，如非靠近大江大湖，是不易很快地找到的；如放养小的鱼苗，短时间内又不容易长大。
又作鱼池法：三尺大鲤，非近江湖，仓卒难求。若养小鱼，积年不大。
There is another way to make a fish pond: it is not easy to find a big carp that is 3 尺 long quickly, unless it is near a big river or lake; if you put small fry in, it will not be easy for them to grow up in a short time.
<s>[INST] Kindly elucidate the central themes in this passage in English: 又作鱼池法：三尺大鲤，非近江湖，仓卒难求。若养小鱼，积年不大。 [/INST] There is another way to make a fish pond: it is not easy to find a big carp that is 3 尺 long quickly, unless it is near a big river or lake; if you put small fry in, it will not be easy for them to grow up in a short time.</s>
Kindly elucidate the central themes in this passage in English: 又作鱼池法：三尺大鲤，非近江湖，仓卒难求。若养小鱼，积年不大。
user
There is another way to make a fish pond: it is not easy to find a big carp that is 3 尺 long quickly, unless it is near a big river or lake; if you put small fry in, it will not be easy for them to grow up in a short time.
assistant