Crawfish feeding is not easy to die
On June 25th, a reader in Suyu District of Suqian City reported to this newspaper that he had first cultivated crayfish for the first time this year. There were a total of 3 ponds, about 3 mu. In early May of this year, a small body about 4 cm in length was released per acre. Lobster seedlings 60 kilograms, farming pond shrimp ditch depth of about 50 cm, other places about 10 cm depth. Feed mainly used fish feed 7.5 kg plus a small amount of earthworm, soybean meal, miscellaneous fish and so on. Since the beginning of June, crayfish have been dying, and they have mostly died before and after death. At present, approximately 10 kilograms have been lost in each pond. He asked: Why did crayfish die? What should I do?
From the reader's point of view, the layout of the first culture pond is irrational. Generally, when the crayfish are cultivated in paddy fields or other aquatic vegetables, the lobster farming ditch is 4-6 meters wide, 0.8-1 m deep, and the slope ratio is 1 to 2.5. Larger plots of land are also required to excavate field ditch in the field. The ditch is 1 meter wide and 0.5-0.6 meters deep. Aquiculture ditch and field ditch area accounts for about 20% of aquaculture area. The depth of the reader's crayfish culture pool is not enough. Perhaps the current impact on crayfish is not great, but when the temperature rises in July and August and the weather is hot, this water level is not enough to raise crawfish and crayfish poles. Can easily cause stress or death due to excessive water temperature. The depth of shrimp ponds should be deepened.
When the seedlings are released, the new pond mouth can be stocked with larvae or broodstock, and the larval rearing ponds can be preserved from the pond. If the larvae are directly placed, they are usually stocked with 150-180 tails/kg of crayfish fry 7800 in April-July. At the end, ensure that there are more than 10,000 juvenile shrimp per acre.
From the perspective of the death and mortality of crawfish expressed by the reader, it may be due to insufficient feed nutrition. After the common crayfish come into the pool, in the initial stage of stocking, the main fish paste and chopped small trash fish are fed in an amount of 0.5%-1% of the total shrimp weight; as the water temperature gradually increases, the main cast pellet feed, and the early crude protein remains About 3.5%, the amount of feeding increased from 1% to 3%; during the summer and high seasons, the feed was mainly fed with pellets, supplemented with wheat, corn, and fresh waterweeds, of which the amount of concentrate feed accounted for 3 of the shrimps. %-5%, particle feed protein content of 28% -30%, the main vote after the mid-autumn pellet feed, feeding gradually reduced to about 1% of the amount of shrimp. The farmer uses fish feed. The energy and protein in the feed may not meet the nutrition standards for crayfish growth. The crayfish feed should be replaced immediately, and the feed amount should be appropriately increased, and Quanchiposa should be used. Lime disinfection, at the same time choose to continuously sunny gas, appropriate follow-up compound fertilizer such as calcium magnesium phosphate 2-3 times, not only can supplement the trace elements of shrimp, but also promote the growth of plants in the pool. In addition, we must also pay attention to the management of water body oxygenation and changes in water quality.
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