Reservoir supporting net ecological breeding river crab
2021-05-23
The cultivation of river crab has always been based on pond specialization, polyculture, or enclosure, and the use of natural eco-environment of reservoirs to support ecological aquaculture is a new breeding technology model that is worthwhile to be economically viable. Because of the advantages of reservoir water quality and natural ecology, compared with supporting nets, raising crabs and ponds, and replenishing crabs, it has the characteristics of reduced aquaculture costs, high crab quality, and significant benefits. According to experiments, ecological breeding of reservoirs with supporting nets can increase 5.9 kilograms of high-quality river crabs, and increase profits of 40-80 yuan per mu. The main technical methods are summarized as follows:
1, fence area, shape, structure. An area of 30 to 150 acres is appropriate, the shape of a circle as well; nets for the inside and outside the two layers of polyethylene mesh cloth, the internal mesh size 2cm, external mesh 3~5cm; under the net foot into the mud more than 30cm, wall A 40 cm high anti-escape plastic plate is sewn on top and a fixed pile is set every 2 to 5 meters.
2, crab species stocking. Before March, one foot will be enough to put 150 to 350 sticks of crabs with a specification of 120 to 260 sticks/kg, or 500 to 800 sticks if supplemented by artificial feeding. Before the plants are sprouted and the growth is relatively plentiful (April to May), a small net enclosure is built in the net enclosure, and the crab species are raised and fed with small trash fish, screws, stewed meat, vegetable pods, soybean meal, wheat, etc. . Crab species stocking must be disinfected.
3, planting aquatic plants. Aquatic grass is both a feed and habitat for crabs, a place to avoid enemies and shelling, and it can increase dissolved oxygen and purify wood. The plants suitable for planting in the net and the crabs prefer to eat are mainly Hymenocallis, Vallisneria and Elodea.
4. Transplant snails. In February and April, 100 kg of fresh snails were released for natural breeding on the water surface per mu. Summer conditions should also be supplemented from time to time. To provide live bait for crabs and to purify the bottom water.
5, nesting fish, shrimp. A total of 30 catfish were released per acre in the enclosure, and 2 kg of green prawns were robbed. Salmon filter food can adjust the water quality, and shrimp breeding can supplement crab live food.
6. Keep water flowing. Wash nets and sundries often. When the grass is thick, every 20-30 meters will open a grass-free channel of about 2 meters. Maintain the circulation of water around the net, exchange inside and outside, and keep the water fresh.
7, feed feeding. Seine ecological farming, as long as the natural bait such as water grass, spirochetes, shrimp, etc., is ideal for planting and cultivation, it is generally not necessary to feed artificial feed. In the case of increased crab stocking rates and natural baits can not meet the circumstances, can be fed an appropriate amount of fresh small fish and aquatic plants, Cai Bai, cypress and other artificial animal and plant feed. In the early stage of breeding, animal feed is mainly used. In July and September, vegetable feed is used. In the middle and late September, animal feed is preferred. Every evening in the evening, the amount is even.
8, fishing time. According to the temperature and market flexibility, generally in late September and early October can be listed on the market. The catch and catch rate of land use cages can reach more than 60%. Harvested crabs have the best economic benefits when they have good market specifications, mature plumpness, temporary raising and fattening, and market availability.
Plant Support Net also named plant support netting,Pe vegetable netting is a solid versatile plastic mesh, designed to provide both vertical and horizontal support to climbing plants or vegetables and horizontal support to long-stemmed flowers.Used vertically, it can support crops like beans and peas till the crops are at their heaviest and ready for harvesting.
Laid horizontally, Plant Support Net in layers becomes a fairly effective guide to space-keeping in planting. Successive layers can be fixed at brackets with the continuing growth of plants. This method has been widely adopted by flower growers especially for long-stemmed ones like chrysanthemum, freesia and carnation.
Plant Support Net is clean, economical, harmless to delicate stems or leaves, and quite easy to fix. At the end of planting season, it can be quickly dismantled and rolled up for subsequent use.
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