How to do polyculture in fish ponds in 2020? Prospects and cost-benefit analysis

In recent years, under the pressure of environmental protection and restricted aquaculture, many cages on reservoirs, lakes and other water surfaces have been dismantled one after another. Under such a premise, only fish pond polyculture can ensure maximum economic benefits. So what are the prospects for the fish pond polyculture model in 2020? How should it be farmed? How much are the farming costs and benefits?

1. What are the prospects for the fish pond polyculture model in 2020

In central China, southwestern China and other places, the amount of grass carp (Ctenopharyngodon idella) farmed has increased year by year, the price of grass carp has fallen again and again, and the profit from farming grass carp has become lower and lower. Some fish farmers have found that bighead carp (Aristichthys nobilis) is also a main source of profit in fish pond polyculture. Under the farming model dominated by grass carp, this is an opportunity and a way out, and it is also a choice among conventional fish. The polyculture model of bighead carp + crucian carp (Carassius auratus) + grass carp + silver carp (Hypophthalmichthys molitrix) can effectively use the pond space and significantly increase farming benefits.

High-density intensive farming dominated by bighead carp makes full use of the pond space and fish-carrying capacity. The farming output will be relatively high, and relatively high economic benefits can be obtained, but at the same time the requirements for farming hardware equipment and software are also relatively high.

2. How to carry out the fish pond polyculture model

Farming target: bighead carp yield reaches 1000 jin per mu.

Farming area: based on 1 mu, with a water depth of about 1.5-2 m.

Stocking specifications: bighead carp 0.1-1.5 jin, crucian carp ≤1 liang, grass carp ≤1 jin, silver carp ≤0.5 jin.

Stocking model: bighead carp 1 (≤0.5 jin) 100 fish, bighead carp 2 (0.5-1 jin) 100 fish, bighead carp 3 (1-1.5 jin) 150 fish, crucian carp 100 fish, grass carp 50 fish, silver carp 50 fish, totaling 550 fish, among which the main farmed species bighead carp accounts for 63.6%, the polycultured crucian carp accounts for 18.2%, grass carp accounts for 9.1%, and silver carp accounts for 9.1%.

Stocking density: bighead carp 350 fish/mu, crucian carp 100 fish/mu, grass carp 50 fish/mu, silver carp 50 fish/mu.

3. Cost-benefit analysis

1. The first month after stocking

Calculated at a feeding rate of 1%, the estimated feed input in the first month is 3.75 jin × 30 days = 112.5 jin/mu; in the early spring stage, emphasis should be placed on fertilizing the water and cultivating algae, while using organic manure 600 jin/mu + Sufei Bao sprinkled over the whole pond. Bighead carp can grow to 0.6-1.8 jin at the fastest.

2. The second month after stocking

In the second month, the estimated feed input is 4.5 jin × 30 days = 135 jin/mu. This month still focuses mainly on fertilizing the water and cultivating algae, using organic manure 600 jin/mu + Yujun Bao 1 bottle for 2-4 mu sprinkled over the whole pond. Bighead carp can grow to 0.72-2.16 jin at the fastest.

3. The third month after stocking

In the third month, the estimated feed input is 5.4 jin × 30 days = 162 jin/mu. This month the temperature rises, various metabolisms in the water intensify, and pathogenic bacteria and parasites begin to reproduce in large numbers. Iodine Bao should be used for disinfection and pest killing once each, with an interval of 3 days. At the same time, attention should also be paid to regulating water quality, keeping the water body fertile but not old, while using organic manure 600 jin/mu + Yujun Bao sprinkled over the whole pond. Bighead carp can grow to 0.8-2.5 jin at the fastest.

4. The fourth month after stocking

In the fourth month, the estimated feed input is 6.46 jin × 30 days = 193.8 jin/mu. This month enters summer, high-temperature weather gradually arrives, and cyanobacteria in the pond begin to reproduce in large numbers. Using Aohua Hushui Bao can effectively alleviate water toxins caused by cyanobacteria outbreaks, while combining it with live bacteria Hugai Bao 1 jin/mu sprinkled over the whole pond. Bighead carp can grow to 1.0-3.1 jin at the fastest; by the end of this month, up to 466 jin/mu of bighead carp of 2.1-3.1 jin can be sold.

5. The fifth month after stocking

In the fifth month, the estimated feed input is 3.1 jin × 30 days = 93 jin/mu. This month the fish grow the fastest, the accumulated feed input is also relatively large, and the water body load increases. Emphasis should be placed on purifying water quality. Using Wujin Liangshui Bao sprinkled over the whole pond can effectively degrade excess organic matter in the pond. At the same time, combined with Hudi Bao, it can effectively reduce ammonia nitrogen and nitrite. The remaining bighead carp can grow to 1.2-2.4 jin at the fastest.

6. The sixth month after stocking

In the sixth month, the estimated feed input is 3.72 jin × 30 days = 111.6 jin/mu. At the same time, use Sufei Bao + Feishui Bao sprinkled over the whole pond. The remaining bighead carp can grow to 1.49-2.98 jin at the fastest.

7. The seventh month after stocking

In the seventh month, the estimated feed input is 4.47 jin × 30 days = 134.1 jin/mu. At the same time, use Aohua Yujun Bao + Hudi Bao sprinkled over the whole pond, sprinkled over the whole pond. The remaining bighead carp can grow to 1.79-3.58 jin at the fastest; by the end of this month, sell 358 jin/mu of bighead carp above 1.79 jin.

8. The eighth month after stocking

In the eighth month, the estimated feed input is 1.79 jin × 30 days = 53.7 jin/mu. At the same time, use Zaofeng Bao + Digai 1 jin/mu sprinkled over the whole pond. The remaining bighead carp can grow to 2.1 jin at the fastest. According to the feeding and management conditions, full pond clearing and selling may be considered (up to 214 jin/mu can be produced), to obtain the year-end benefit settlement.

It can thus be seen that within the farming cycle, as long as the survival rate of farming remains at a relatively high level, together with the diligent management of the farmer, it is completely feasible for the fish pond polyculture model mainly farming bighead carp to achieve a yield of 1000 jin per mu.