In recent years, the general fish and crab polyculture pool uses avermectin, ivermectin and other drugs
Some parasites such as Chinese sturgeon, anchor head locust, nematode, and helminth are sprinkled and exterminated, but after long-term use, parasites have a strong resistance to them, and in order to kill them, they must constantly increase the dose. The increase in the amount of medication has caused certain damage to the animals such as fish and crabs. In particular, some farmers use trichlorfon to kill the head lice, which often causes the fish to lose appetite for several days, directly affecting its normal growth.
The head of an oystercatcher generally lives for about 14 days. From spawning to hatching, it lasts for 2 days to 3 days. General insecticides can only kill its larvae and cannot kill its eggs and adults. In view of the above situation, it is recommended that farmers should not be impatient in killing the anchor head lice. By checking the period of the anchor head locust that is parasitized on the fish, timely medication should be used, and do not increase the dose. If it is an old worm, there is no medicine and it is decided whether to re-administer the medicine according to the recurrence at intervals of 5 days to 7 days.
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