After the crabs have been shelled for the last time, they can be picked up after a further 15-30 days of cultivation. During this period, a stock called the crab fattening period, crab production and management of the fattening period will directly affect the crab quality and market specifications, a great impact on aquaculture efficiency. How can we make the market's river crab reach the best? The author has learned from his own breeding experience and understanding and analysis of a large number of farmers, and concluded that the following three directions must be reasonably done.
First, a reasonable change of water to maintain good water quality
To maintain good crabs, we must first ensure that the water quality of the pond is good. In the spring and summer season, the ponds are used to prevent and cure diseases and medications. It is inevitable that there will be some residual substances, and it is necessary to constantly change new water in the autumn to prevent the pool water from deteriorating and to keep the pool water properly. The transparency of the crab pool is generally 35 cm or more. Changing the water is best done before the last shelling of the crabs. It will not only improve the water quality, but also make the crabs shell out neatly and smoothly. Change the water every 10 days or so, and change the amount of water each time is less than 30% of the total amount.
Second, reasonable feeding, ensure adequate nutrition
During the fattening period of the crab, the feed must be well fed and sufficient in quantity. It is best to feed the crab-specific material with a protein content of 32% or more, or it can be a fresh animal bait. The amount of daily feeding is 10% of the total amount of crabs. About the actual production in the basic food after feeding 2 to 3 hours shall prevail, with the gradual decline in temperature, water temperature, the amount of daily feeding to be gradually reduced. Feeding time is generally dominated by early evening, supplemented by early morning, and the amount of feeding in the evening should account for 80% to 90% of the daily feeding amount.
Third, rational application of pesticides to ensure physical health
During the fattening period of crabs, the prevention of pests and diseases is persevered and prevented. In particular, for the prevention of ciliate diseases, a combination of “eliminating consumption†and “internal administration†should be adopted to prevent the occurrence of diseases and insect pests. Can be used for 10 days after the last shelling crab with chlorine dioxide and other materials Quanchiposa 1, while in the feed can be added to prevent diseased crabs with drugs bait feeding, and even fed 5 to 7 days. If the river crabs in the mouth of the pond are normal from spring to summer, they can use the whole microbial sprinkling of whole microbial preparations to prevent disease and enhance the body of crabs.
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