Method of temporarily keeping river crab for sale

Abstract

The method of temporarily keeping river crab for sale includes four parts, including selecting temporarily keeping pond, selecting river crab to be kept, determining temporarily keeping density and managing. It features the selection of temporarily keeping pond near water source with convenient water pouring and draining ports, area of 3-5 unit of area and water depth of 1.5-1.8 m; selecting robust river crab and sterilizing with 4 wt% concentration salt solution for 10-15 min; the temporarily keeping density of 2000-2500 / mou or 200-250 kg / unit of area and temporarily keeping period of 1-3 months; and managing including laying bait of 3-5 wt% of crab weight once a day, changing water of 15-25 cm once every 5-7 days, spraying lime once every 20-30 days, spraying 0.5 ppm concentration trichloroiso cyanuric acid concentration to sterilize water regularly, and feeding terramycin and furazolidone mixed into feed for continuous 5 days every half one month.

Description

technical field [0001] The invention relates to a method for temporarily raising river crabs for sale. Background technique [0002] Temporary cultivation of river crabs means that sexually mature river crabs are harvested and fattened for a short period of time for sale. However, if the management is not proper during the temporary raising process, it is easy to cause a large number of temporarily raised crabs to die. There are several reasons for this: [0003] 1. It is physical death. After the gonads of river crabs are mature, they carry out reproductive migration for the reproduction of offspring. If they continue to be kept in fresh water for a while, they will cause physiological disorders, and the osmotic pressure in the body will be too high and they will die (swelling). Therefore, during the temporary raising of river crabs, over-mature yellow crabs should be removed. [0004] 2. The quality of river crabs is poor. The specifications of the temporarily raised ...

AI Technical Summary

Problems solved by technology

[0004] 2. Poor quality of river crab

This will easily lead to killing each other during the temporary breeding process, and the mortality rate of small-sized crabs is high, and it is also easy to cause the infection of river crab disease.

[0005] 3. Poor ecological conditions

The area of ​​the holding pond is small, the coverage rate of aquatic plants is low, the water level is too shallow, the water quality changes rapidly, and the dissolved oxygen is low, etc., often make river crabs come ashore frequently and breathe oxygen in the air, resulting in a lot of physical exertion. Over time, the mortality rate will be greatly increased.

In addition, the water quality is fertile, and the temporary breeding density is high, which can easily cause temporary breeding crabs to suffocate and die

[0006] 4. Insufficient feeding amount

First, it will cause river crabs to kill each other in order to compete for limited bait, which will affect the survival rate of temporary cultivation; second, it will cause river crabs to escape due to hunting for bait