Method of temporarily keeping river crab for sale

A technology for river crabs and temporary ponds, applied in fish farming, application, climate change adaptation, etc., can solve problems such as poor ecological conditions, excessive physical strength, and mutual killing.

Inactive Publication Date: 2007-12-19
朱训猛
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  • Abstract
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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 ox

Method used

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Examples

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Embodiment Construction

[0009] 1. It is a scientific choice of holding pool. Choose a pond mouth that is close to the water source and convenient for drainage, with an area of ​​3-5 mu and a water depth of 1.5-1.8 meters. Before use, use 100kg of quicklime per mu to thoroughly clean the pond. After 5 days of water intake, aquatic plants are evenly distributed in the pool, and the coverage rate is above 40%.

[0010] 2. Quality requirements for river crabs. Temporary breeding of crabs requires a healthy body, uniform specifications, complete carapace and appendages, no disease, no injury, and enough to be released at one time. The selected river crabs are soaked with 4% salt water for 10-15 minutes, and then disinfected and sterilized. In case of soft-shell crabs and top-shell crabs during the stocking process, they should be picked out and temporarily raised after the shell hardens, and then put into the temporary raising pond.

[0011] 3. Temporary breeding density. Generally, 2000-2500 river c...

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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 ...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 朱训猛
Owner 朱训猛
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