The salmon that are stocked in paddy fields, due to their small size, are vulnerable to predators and result in reduced yields. Therefore, it is very important to prevent predators. 1 Mink Mushi 60 kg of tea bran can kill leeches within one month before the fish species are released. If water fleas are found during stocking, the squid and mink can be fished into a cage and sprinkled with the appropriate amount of kerosene so that the leeches can suffocate after reaching the kerosene. 2 In the first half of the month before the tiger frog was released, Mushi lime 20kg can kill all the tiger frogs. After 3 to 5 days, use 2 kg of flour per 5 kg of fresh pig's blood to make pellets. Sprinkle rice fields and kill tiger frogs 2 times. The effect is excellent. 3 Water snakes can be trapped with snake traps and bamboo cages, or during the hot nights, the water snakes can be killed manually when they catch cold in the shallow water. 4 The grasshopper placed the loofah with coagulated pig's blood in the pores in the field ditch in the evening and put 8 to 10 mu. The next morning, the loofah was collected and the grasshopper drilled into the network was killed. 5 This lake algae has glial membranes that cannot be digested after eating. And after the death of this kind of algae, the sediment decomposes in the bottom of the trench to produce toxic substances, causing the fish to die. Can be splashed with 0.5g of copper sulphate solution per cubic meter of paddy field water to kill lake trout.
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