Crayfish rearing in ponds, once mixed with wild squid, black fish, squid and other miscellaneous fish, will lead to food and lobster competition phenomenon, to a large extent interfere with the normal feeding and growth of lobster, and even make crawfish in a certain period of time up Less than the specifications of the listed shrimp, thereby affecting the aquaculture benefits. Through practice, the following three measures are adopted, which will not only affect the normal growth of lobsters, but also improve the efficiency of pond culture. 1. The biological removal method is to use the characteristics of squid only to feed on the active feed, and convert the small scads in the lobster pond into squid with higher economic value to improve the efficiency of pond culture. In the case of not adding feed fish, 3 to 5 tails of stocking carp can be used per acre of water; if fish feed is properly added at a later stage, 10 to 15 tails of carp can be raised per acre of water. In general, 150 kg of carp, 160 kg of crayfish, and 4,000 yuan of pure benefit can be produced per mu of water. 2. Bioagglutinin removal If lobster ponds do not contain mullet, some hemoglobin lectins can be used directly to kill small trash fish. Such as "kill fish and shrimp security", dilute 2000 times diluted Quanchiposa, 1 meter deep water per acre of the use of 60 to 80 ml. It can remove all kinds of wild fish, snails, and inner species in the pond, but it is harmless to shrimps and crabs. 3. Tea seed cake removal method Tea seed cake contains 12% to 18% of tea saponin, which can make the red blood cells of aquatic animals melt, so it can kill wild fish, snails, river otters, frog eggs, quail and part of the aquatic Insects, but almost no effect on shrimps and crabs. In the intensive culture of freshwater crayfish ponds, if more wild fish are found, 8 to 10 kg of tea seed cake can be used per acre of water. After soaking in water, the whole pool is splashed. On the one hand, the wild fish in the pond is removed. On the one hand can promote crayfish shelling.
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