The method of cultivating dungling crab seedlings is not proper, and the phenomenon of early maturity and semi-prematurity of crabs often occurs, which seriously affects the economic benefits of farmers. Feeding early-maturing and semi-precocious crabs often results in small or dead crabs, resulting in serious losses. Through practice, I believe that there are two main reasons for causing precocious crabs. First, shallow water, high water temperature, and small aquaculture area. Second, improper feeding methods, too many protein feeds, and more water quality, prompting crab seedlings. Precocious and semi-precocious. In particular, the species of dungling crabs raised in inner ponds along the coast are more prevalent due to the higher salt content in the pool water. How to control the phenomenon of premature and semi-prematured deduction of crab seedlings? Put forward the following five measures for the relevant farmers to reference: First, crab ponds to simulate the natural ecological environment, plant some aquatic plants in the seedling pool, and put water peanuts Such as aquatic weeds, the area can be one-third of the body of the water. The aquatic weeds can not only feed, hide, attach, shell, and cool the crab seedlings, but also aquatic animals can breed many aquatic animals, which can increase the natural bait of crab seedlings. Water plants can also absorb fertilizer and water and play a role in purifying water quality. Second, breeding dunk crab must grasp the feeding method. When big-eyed larvae plunge into ponds, the water must be fat, and appropriate amount of plankton should be cultivated. That is to say, pre- and late-phase feeding should be refined, and medium-term should be young. Specifically, in the 4th to 5th phase of the juvenile crab, the main material should be concentrated, and some small fish and grain bait should be fed; in July, August and September, To feed less concentrate, feed more palatable water plants, such as calves. The weather is hot, and crabs like to eat cold baits. Therefore, it is necessary to use rough generations, which not only saves the cost of feeding, but also controls the early maturing of crabs. After October, the climate gradually declines and the crabs stop shelling again. During this period, the concentrate must be used. Seedlings are vigorous wintering. Third, do a good job of injection and drainage work, continuously improve water quality, increase water level, increase dissolved oxygen, and control fertilizer. Fourth, to adjust the pH value of the pool water, the optimal pH value for the growth of crab seedlings is between 7.5 and 8.5. To maintain this standard, we must use twice-a-day quick lime, usually 15 kg per mu, which can be adjusted. Water quality can also prevent seed diseases. Fifth, the pond culture crab dung should be moderate density, the area should not be too large or too small, generally about 2 acres is appropriate, the best type of culture crab pond mode is plate type, should not set up the crab island, pool slope should not be steep, slope Better than 1:4, water depth is about 1.5 meters.
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