Fresh meat is delicious and it is a rare aquatic product popular among the people. At present, the ponds raise shrimp, and the high-yield tangkou can produce more than 100 kilograms per mu. The value is about 5,000 yuan, and the production efficiency is considerable.
Self-breeding and self-cultivation seedlings are the fundamental ways to do a good job of raising shrimp production. Correctly controlling breeding techniques is the basis for self-cultivation and self-breeding.
(a) The water temperature required for spawning by selected broodstock during spawning is above 18°C. In the middle and lower reaches of the Yangtze River, from mid-April to mid-September, from June to July, it is the peak of spawning, with the peak period from mid-June to mid-July.
(b) Spawning and Hatching In spawning groups, broodstock are spawned from June to July. Individuals are relatively large. This is the oldest shrimp after wintering. The broodstock that spawn after July 7 are smaller. The shrimp that grew after the breeding year. The entire process of spawning and hatching takes place in cages. The cages are divided into incubators and incubators. The incubator is made of polyethylene net cloth with a mesh size of 196 meshes/cm2. The specification is 10 meters and 667 meters and 1.7 meters. The bottom of the box and the upper mouth of the box are each equipped with a polyethylene rope, and the cage is open and floating. When installing, make the cage 0.3 meters above the water surface to prevent shrimp escape. Place 1-2 wood-dyed small cages for hatching in the box, and make them with a mesh of 12 mesh/cm2 polyethylene mesh, with a specification of 1.7 meters and 1 meter. 5 meters, the cage is exposed when exposed to water 5 centimeters, and a small brick is attached to the four corners of the box.
The broodstock should be moved to the incubator for fattening before spawning. When the water temperature reached 18°C, broodstock mated and eggs were laid within 24 hours after mating. When the female is pregnant, the abdomen extends and flexes, and the back is raised. The eggs produced were oval in shape, with many yolks, and clumping in the abdomen of the female bristles l-4 pairs of appendages. After the winter, the aged shrimp can spawn two times in succession. The second spawning is after the egg hatched for the first time. The number of spawns in the shrimp is related to the age and body length of the broodstock, and the aged shrimp after wintering. Up to 5,000 eggs can be laid, and the shrimp that matured that year have a body length of 3 cm and a maximum of 700 eggs.
When the eggs appear compound eyes, the female eggs should be placed in hatching cages, 700-1000 per cage. After 6-7 days, the larvae can break the membrane and fall out of the broodstock and fall into the incubator. At this point, the incubator should be taken out of the cage together with the hatched broodstock.
The appearance is tan, and the cork is red-brown at the flaking; there are intermittent stripes on the branches, nodules are enlarged, and the shape is like a bead. Most of the hard and delicate roots and fibrous roots are born, and some surfaces are smooth and smooth, such as stalks. It is commonly known as "crossing the river branches" or "crossing bridges"; there are brown scales on the upper part, and there are residual stems or petioles that have not been cleaned at the top. The quality is firm and hard, the section is irregular, the skin is dark brown, the wood is golden, the rays are cracked, the central pith is red and yellow, and occasionally hollow. Odorless, very bitter taste, chewing saliva can be dyed red and yellow. It is better to use fat, beaded, solid, red-yellow, no residual stems and fibrous roots.
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