In the case of no waste, we mainly raise grass carp and eat mixed fish feed on the market. The feed coefficient of big brands is about 4000 yuan, which is about 1.5. Other species are relatively higher, that is to say, to grow a catty of fish, you need to eat 1.5 jins of feed, which is 6 jins of feed. If you buy your fish, you need to eat 12 yuan per catty.

The simple thing is that an extra catty of fish needs 3 yuan for feed.

If you want to calculate the cost, you must calculate fertilizer, pond rent, labor, electricity, and so on.

Grass carp grows very fast. As far as the whole growth process is concerned, the fastest growth period of body length is 1 ~ 2 years old, and the fastest growth period of body weight is 2 ~ 3 years old. When the 4th instar fish reached sexual maturity, the growth rate slowed down obviously. 1 winter fish is about 340mm long and weighs about 750g g. Winter fish is about 600 mm long and weighs 3.5 kg. The 3-year-old fish is about 680 mm long and weighs about 5 kg. The winter fish is about 740 mm long and weighs about 7 kg. 5 Winter fish can reach about 780 mm and weigh about 7.5kg；; The largest individual can reach about 40 kilograms.

So it can reach 3 kg in a little over a year.