Control techniques of small melon disease in cultured rainbow trout
1. Symptomatic watermelon disease is also called white spot disease. The insect parasites on the body surface, mouth, eyeball and Gill of rainbow trout, and many white spots are visible to the naked eye. When the white spots are scraped off and placed on the water droplets on the glass slides, the white spots can be seen moving along the edge of the water droplets. If parasitic on the eyeball, it can cause eyeball turbidity and whitening. When parasitic on Gill, it can make Gill mucus increase, Gill filament rot, and it is difficult for diseased fish to breathe.
2. The pathogen is multi-seed melon worm. 3, the epidemic situation this disease mainly harms the rainbow trout juvenile stage, the epidemic range is wide, is the rainbow trout culture common disease and frequently-occurring disease, the disease water temperature is above 10 ℃, the infection rate can reach more than 90%. It often causes acute death. 4. Prevention and control methods (1) soak the diseased fish in 5% salt solution for 1 minute or 1% concentration for 1 hour, and the effect is good. (2) soak in 4000formalin for 1 hour.
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How to carry out artificial lactation in cultured bamboo rats
When is it necessary to artificially breast-feed the cubs of bamboo mice? For example, if the mother rat does not bring her cub, the mother rat dies accidentally without breast milk, and so on, we need to carry out an artificial lactation. Sichuan Yinghao bamboo rats usually fill cattle with artificial lactation of bamboo rats.
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Cage cultivation technique of black fish fingerling
1. Stocking density: generally put 3 cm summer flower fish fry 600 million 700 pieces per square meter, out-of-box specification is about 6 cm 8 cm. The summer flower fish species must be strictly separated and screened, so that the specifications are the same, and the stocking density should be properly adjusted according to the size of the specifications. 2. Feed and input
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