Prevention and treatment of protozoan disease of large yellow croaker Pseudosciaena Crocea
(1) pathogen stimulates cryptosporidium (Crypjocaryonirrions).
(2) there are small white spots on the body surface and gills of symptomatic diseased fish. These white spots are white vesicles formed by parasitic parasitism, host stimulation, secretion of large amounts of mucus from surrounding tissues and proliferation of epidermal cells. If the disease is serious, the body surface tissue is destroyed. If bacteria invade, it can cause skin inflammation, scale exfoliation, fin membrane decay, split, corneal damage and blindness. He died of being weak, swimming slowly and having difficulty breathing.
(3) the control method ① was sprinkled with 0.3 × 0.000001 sodium dichloroisocyanurate in the whole pool, which had a certain effect. ② 25 × 0.000001 formalin was sprinkled in the whole pool. After half the water was replaced the next day, the medicine was applied again. ③ washed the diseased fish with 17 × 0.000001 × 20 × 0.000001 copper sulfate for 60 minutes, once a day for 3 days.
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There are five ways to kill the beetle.
The larvae of beetles, commonly known as chicken dung insects, gnaw on the roots of seedlings, in addition to biting lateral roots and main roots, but also can peel off the root skin, resulting in lack of seedlings and broken strips, and in serious cases, it will also cause devastating disasters. Adult beetles like to eat both leaves and flowers, and the reproduction speed is very fast, which is easy to cause harm to seedlings, and is a common major pest in forestry. The time of rampant adult damage is about June to October, which is the best period of control, that is, to control the adult damage and the population density of the next generation, we will get twice the result with half the effort.
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Fishing methods and transportation techniques of adult crabs
Now the river crab fishing methods and transport techniques are introduced as follows: 1. Water fishing: it is the river crab reproductive return season, the vast majority of river crabs leave the cave to the pond activities. A net or trap is arranged at the outlet of the crab pond, and then the pool water is discharged slowly, and a large number of river crabs can be caught in the net or trap. 2. Light trapping method: draw out a certain amount of water to retain the water depth of about 30 centimeters. When the river crabs come ashore at night, put a lamp on the four corners of the pond, bury a tank under the lamp, and the light induces it.
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