The work of collecting crabs in crab breeding production is good or bad, affects the level of seedling production, determines the success or failure of nursery, and must be highly valued. According to the experience of high-yielding crab breeding for many years, the author believes that the following aspects should be noted in the collection of crabs:
First, the collection site has good water quality, abundant aquatic plants, rich benthic animals, and lake areas with river crab resources. It is also possible to farm artificial crabs in ponds first, and then select pro crabs from crabs.
Second, the collection time should be selected in the late stage of crab season. Because the temperature and water temperature are lower at this time, the crab's activity ability is weakened and the food intake is reduced. At this time, collecting the pro-crabs will not only improve the survival rate of the transport, but also save the feed after the return and facilitate the management.
Third, the collection criteria should be selected more than 100 grams of body weight, individual large, physical and fat, full-shell hard, disease-free, mature, mature gopher crab. Do not buy yellow shell crab, because the yellow shell crab needs to be shelled once more to enter the mature stage and become shell crab.
Fourth, the collection method The pro-crab put into the pouch, so that the abdomen down, weighing about 12.5 kilograms per pouch. Keep it moist, and be careful to breathe so as not to lose oxygen and die.
V. Collection quantity According to the production situation, it is flexible. It should be noted that the proportion of males to females during mating is generally 2 to 3:1. Therefore, the collection of crabs must also take into account the proportion of males and females. The number of female crabs should be greater than that of male crabs.
First, the collection site has good water quality, abundant aquatic plants, rich benthic animals, and lake areas with river crab resources. It is also possible to farm artificial crabs in ponds first, and then select pro crabs from crabs.
Second, the collection time should be selected in the late stage of crab season. Because the temperature and water temperature are lower at this time, the crab's activity ability is weakened and the food intake is reduced. At this time, collecting the pro-crabs will not only improve the survival rate of the transport, but also save the feed after the return and facilitate the management.
Third, the collection criteria should be selected more than 100 grams of body weight, individual large, physical and fat, full-shell hard, disease-free, mature, mature gopher crab. Do not buy yellow shell crab, because the yellow shell crab needs to be shelled once more to enter the mature stage and become shell crab.
Fourth, the collection method The pro-crab put into the pouch, so that the abdomen down, weighing about 12.5 kilograms per pouch. Keep it moist, and be careful to breathe so as not to lose oxygen and die.
V. Collection quantity According to the production situation, it is flexible. It should be noted that the proportion of males to females during mating is generally 2 to 3:1. Therefore, the collection of crabs must also take into account the proportion of males and females. The number of female crabs should be greater than that of male crabs.
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