What is the main proportion of grass carp and silver carp cultured in 4 mu 2 m deep fish ponds?

Pond culture is also divided into two ways: "sparse cultivation and wide cultivation" and "intensive cultivation and close cultivation".

(1) dilution and extensive culture

It is a breeding method that completely uses the natural bait in the pond for stocking. The stocking density and collocation ratio are mainly determined by the nutrient type of the pond.

Located in the plain area, the eutrophic pond with large rainwater collection area and rich natural bait can raise 12 ~ 13 cm of fish every year, with the proportion of bighead carp 50%, silver carp 45%, grass carp and mackerel. If this pond is carefully managed, the output of commercial fish in that year can reach 7.5 kilograms per 100 square meter of water.

Located in hilly areas, the general nutrient pond with moderate rainwater harvesting area and sufficient natural bait can feed 12 ~ 13 cm of fish every year, and the proportion of bighead carp and silver carp is 50% ~ 60%. The output of commercial fish in this pond can reach 4 ~ 5.5 kilograms per 100 square meter of water.

Located in the valley area, the eutrophic pond with small rainwater collection area and lack of natural bait can raise 7.5 fish per12 ~13cm per square meter of water, and the proportion is 60% bighead carp, 30% silver carp, grass carp, bighead carp and carp. The output of commercial fish in this pond can reach 2.2 ~ 3.0 kg per 100 square meter of water.

(2) Intensive cultivation and closed release

This stocking method is suitable for ponds with an area of 6.67× 10000 square meters and easily controlled culture environment. The stocking density and collocation ratio can be determined according to the nutrient type, fertilization, feeding and management level of the pond. In the pond with rich nutrition and sufficient feed, 30 fish 12 ~ 13cm can be kept every year, and the proportion of silver carp and bighead carp is 50%.

30%, grass carp 15%, carp, crucian carp and bream 5%.

In ponds with average nutrition and poor nutrition, 22.5 ~ 30 fish of 12 ~ 13cm can be stocked per 100m2 water surface every year, and the proportion is 65% ~ 70% for grass carp and 0/5% for bighead carp.