Shrimp and crab breeding have developed rapidly in our country’s fisheries, especially in Jiangsu and Zhejiang provinces. The general shrimp farming acre has a profit of 1,200 yuan, while the shrimp and crab mixed pond has a mu gain of 1,500 to 2,000 yuan. It should be said that throughout the large agriculture, its The aquaculture efficiency is relatively high. However, in recent years, due to the aging of fish ponds, industrialization, urbanization, and other industries, how to maximize yield per unit, improve the quality of aquatic products, and ultimately raise the breeding efficiency in a limited aquaculture area is worthy of discussion. We have surveyed some of the local households that have been highly efficient in breeding and introduced their successful experiences to everyone, hoping to bring some inspiration to everyone.
My brother Tang Yuedong of the town of Shanlian Village in my town has a farming area of ​​25 mu and has been breeding river crab for more than 5 years. His annual mu efficiency is always above 6,000 yuan. In 2005, one of the pools was 10 acres. In March, 6,300 crabs were released, and the specifications were 160/kg. By the end of October, the catch rate was 85%, and the stock size was more than 250 grams per month. Even with an average of 360 kg per mu, the average mu yield reached 130 kg, and the average mu yield reached 7,000 yuan. Summing up his successful breeding experience, there are mainly the following aspects.
First, pond preparation
1. The pond's environmental conditions. Pond selection 5-10 acres, the pool depth must reach 1.5 meters.
2. Clear pond. Thoroughly clear the pond before planting, and use 80 kg of quick lime.
3. Prepare enough animal and plant feed. Animal feed snails must be enough to put 800-900 kilograms of acre; plant feeds Elodea must be kept before the crabs are stocked well, starting from May-June, when the plants grow to exceed the water surface, to cut regularly The height of the aquatic plants does not exceed the water surface, and the area occupied by the aquatic plants is about 60% of the total area of ​​the pond.
Second, seedlings
1. Seed selection. The purchase of crab species must be rigorously selected to require appendages to be sound, neat in appearance, robust in physique, and soaked with potassium permanganate prior to release.
2. Stocking density. Break through the conventional stocking density, and properly increase from the original 500/mu to 700-800/mu and the specification is controlled at 100-160/kg.
Third, daily management
1. Oxygen management. Each pond must be equipped with aeration equipment. Do not go to the crab pond for a lack of oxygen. Due to the increased stocking density, the amount of oxygen consumed in crab ponds has also increased. Therefore, it is necessary to add an aerobic pump every 3 mu of water. During the high season of crab growth, aeration equipment should be kept on a regular basis to give the crabs a comfortable habitat and allow them to grow rapidly.
2. Water quality management. In the aquaculture production process, especially during the growing season, the new water should be added and replaced constantly. The amount of water exchanged is 1/3 of the pool water at the same time. At the same time, it is commonly used for the disinfection of dibrominated and iodine preparations. The pH of the controlled pool water is around 8.5. When it is too high, the calcium-reducing spirit is used to lower it.
3. Feed management. In addition to preparing adequate animal and plant feeds, we must also master the principle of two-headed and intermediate-coarse. In the earlier period, we mainly used brand-granule crab feed. In the medium-term, we mainly used soybean meal, corn, and pumpkin, etc., and later shot some fresh ice-fish or Small fish.
IV. Sales of crabs
Aside from listing seasons for crabs, we also focus on product packaging. Focus on marketing, local conditions, according to many local companies in the season of crabs like to use the packaging of exquisite merchandise crab gifts to customers and friends and relatives of the habit of a part of the river crab packaging into the market: the other part will stay until New Year's Day and the Spring Festival. Because the crab quality and specifications are relatively good, the fierce listing of crabs is often in short supply, and the selling price is also higher than the market price, and has achieved higher economic benefits.
To sum up Tang Yuedong's crab-rearing experience, there are mainly the following points: During the aquaculture process, adequate animal and plant feed should be prepared, and the stocking density should be appropriately increased; traditional intensive fish culture techniques should also be incorporated into the cultivation ideas, and additional oxygen-added equipment should be added. Increase the proportion of animal and plant feeds and increase the amount of live food snails. Only high input can produce high yields.
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