At present, the problem of premature crabbing has been plaguing the crab breeding industry, resulting in a small commodity size and low economic efficiency. For this reason, I have made several observations for reference.
First, premature reasons:
1. Temperature: Temperature has a great influence on the gonadal development of crab. Within the suitable temperature range for crab growth, the higher the temperature, the faster its metabolism and the faster the gonadal development. In recent years, the summer temperature is high and the duration is long, which accelerates the development of gonadal gonads and promotes their early maturing.
2. Nutrition: The biggest differences in the growth process between the cultured crabs and the wild crabs is the different feeding amount. The breeding crabs are pampered in the superior environment created by humans, have sufficient food intake, and are fully nutritional, resulting in excessive accumulation of nutrients in the crab body. It is good for promoting the growth of crabs, but it also accelerates the rapid development of the gonads and forms early maturation.
3. Hormone: When breeding crabs, some farmers add some hormones during feeding to speed up the growth of crab shells, but at the same time these hormones also stimulate the development of gonadal. Therefore, adding hormone is one of the earliest crabs. the reason.
Second, countermeasures and measures:
1. Temperature regulation: The most effective way to adjust the water temperature is to change the water frequently, especially in the summer, by changing the water to reduce the temperature, prevent the crabs from becoming premature due to the high water temperature; secondly, increase the surface coverage of the water and require coverage. The rate reached 30 to 35%. Water grass is a habitat for river crabs. In summer, direct sunlight can be avoided to cool down.
2. Control of nutrition and hormones: To change the condition of some farmers who think that the more the feeding is, the better, in general, the daily feeding amount can make the crab reach 80% full, and excessive feeding will also produce feed. Increased costs, water quality and other unfavorable factors, the appropriate amount of feed can effectively control the crab's gonadal development.
In the use of hormones, full consideration should be given to their negative effects. When using them, farmers should be extremely careful.
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