CATDOLL : CATDOLL: What is the proportion of grass carp and silver carp cultured in a 4-acre, 2-meter-deep fish pond?

It is determined based on the quality of the pond water, the abundance of bait, the depth of the pond water and other conditions.

1. The ponds in front of and behind the houses in the village have a large amount of domestic sewage and organic matter flowing into the ponds. The water quality is relatively fertile and the natural bait is abundant. Silver carp and bighead carp are the main fish species, and 400-600 fish species over 12 cm long can be raised per mu. The specific proportions are: 250-300 silver carp account for 50%, 50-60 bighead carp account for 10%, 100-150 grass carp account for 25%, 50-60 carp account for 10%, crucian carp, bream, catfish, etc. account for 5%. If the pond water is very fertile, about 300 tilapia can also be raised.

2. For field ponds, 350-400 fish species longer than 12 cm should be stocked per mu. The proportion is as follows: 175-200 grass carps account for 50%, 100-120 silver carps account for 30%, 35-40 bighead carps account for 10%, and 35-40 carps, crucian carps, breams, etc. account for 10%.

3. Xingzu mountain ponds generally have lower water temperature and clear water quality, and stock about 300 fish per mu. The proportion of fish stocking is: 180 grass carps accounting for 60%, 75 silver carps accounting for 25%, 15 bighead carps accounting for 5%, and 30 carps, crucian carps, breams, etc. accounting for 10%.

4. For ponds with abundant aquatic plants, grass carp and bream are mainly raised, with about 200 fish released per mu, of which about 100 are grass carp and bream, accounting for 50%, about 60 are carp, crucian carp, silver carp and other fish, accounting for 30%, and about 40 are silver carp and bighead carp, accounting for 20%.

The timing of the trip is determined based on the quality of the pond water, the abundance of bait, the depth of the pond water and other conditions.

1. The ponds in front of and behind the houses in the village have a large amount of domestic sewage and organic matter flowing into the ponds. The water quality is relatively rich and the natural bait is abundant. Fish are mainly raised with silver carp and bighead carp. 400-600 fish species over 12 cm long can be raised per mu. The specific proportion is: 250-300 silver carp account for 50%, 50-60 bighead carp account for 10%, 100-150 grass carp account for 25%, 50-60 carp account for 10%, crucian carp, bream, catfish, etc. account for 5%. If the pond water is very rich, about 300 tilapia can also be raised.

There are two methods for fish farming in ponds: "sparse and extensive farming" and "intensive and dense farming".

(1) Sparse and extensive breeding

It is a farming method that fully utilizes natural bait in the pond for stocking. The stocking density and matching ratio are mainly determined by the nutrient type of the pond.

Located in the plains, with large catchment areas and abundant natural bait, eutrophic ponds can stock 15 to 22.5 fish of 12 to 13 cm in diameter per 100 square meters of water surface each year, with a mix of 50% bighead carp, 45% silver carp, and 5% grass carp, bream, carp, etc. If such ponds are carefully managed, the annual commercial fish production can reach 7.5 kg per 100 square meters of water surface.

In a general nutrient pond located in a hilly land fissure belt with a medium catchment area and abundant natural bait, 10 to 15 fish of 12 to 13 cm in diameter can be stocked per 100 square meters of water surface each year, with a mix of 50% to 60% bighead carp, 30% to 45% silver carp, and 5% to 10% grass carp, bream, carp, etc. The commercial fish output of this type of pond can reach 4 to 5.5 kg per 100 square meters of water surface.

Oligotrophic ponds located in valleys with small catchment areas and lack of natural bait can stock 7.5 fish of 12-13 cm per 100 square meters of water surface each year, with a mix of 60% bighead carp, 30% silver carp, and 10% grass carp, bream, and carp. The commercial fish yield of such ponds can reach 2.2-3.0 kg per 100 square meters of water surface.

(2) Intensive breeding and intensive stocking

This type of stocking is suitable for ponds with an area of ​​less than 6.67×10,000 square meters and an easily controlled breeding environment. The stocking density and matching ratio can be determined according to the nutrient type, fertilization, feeding and management level of the pond. In a nutrient-rich pond with sufficient feed, 30 fish of 12 to 13 cm in diameter can be stocked per 100 square meters of water surface each year, with a matching ratio of 50% silver carp and 50% bighead carp.

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

For ponds with general trophic and oligotrophic properties and sufficient green bait, 22.5 to 30 fish of 12 to 13 cm in size can be stocked per 100 square meters of water surface each year, with the ratio of grass carp 65% to 70%, bighead carp 15%, silver carp 10%, and carp, bream, crucian carp, etc. 5%.