How to remove sundries from lobster ponds

Raising crayfish in the pond, once mixed with wild silver carp, black fish, crucian carp and other miscellaneous fish, will lead to the phenomenon of competition between mixed fish and lobster, interfere with the normal feeding and growth of lobster to a large extent, and even make crayfish can not meet the specifications of listed shrimp within a certain period of time, thus affecting the efficiency of culture. Through practice, the following three measures can not only not affect the normal growth of lobster, but also improve the benefit of pond culture.

Biological cleaning method

It is to make use of the characteristic that mandarin fish only eat active feed to transform small and medium-sized miscellaneous fish in lobster pond into mandarin fish with higher economic value, so as to improve the efficiency of pond culture. In the case of not adding fodder fish, 3 fish fry per mu of water can be stocked; if fodder fish are added properly in the later stage, 10 fry of mandarin fish can be raised per mu of water. Generally, per mu of water can produce 150kg mandarin fish and 160kg crayfish, with a net benefit of 4000 yuan.

Biological agglutinin removal method

If there is no mandarin fish in the lobster pond, some hemoglobin lectins can be directly used to kill small miscellaneous fish. If use "kill fish to protect shrimp an", dilute 2000 times with water, sprinkle in the whole pond, use 60-80 milliliters per mu of water depth of 1 meter. It can remove all kinds of wild fish, clam and inner class in the pond, but it is harmless to shrimp and crab.

Tea seed cake removal method

Tea seed cake contains 12%-18% tea saponin, which can dissolve the red blood cells of aquatic animals, so it can kill wild fish, snails, mussels, frog eggs, tadpoles and some aquatic insects, but has almost no effect on shrimp and crabs. In the intensive culture of freshwater crayfish in the pond, if more wild miscellaneous fish are found, 810 kg tea seed cake can be used per mu of water and sprinkled in the whole pond after soaking in water. On the one hand, it can remove the wild miscellaneous fish in the pond, on the other hand, it can promote the crayfish to shell.