Disease control of soft-shelled turtle-trichoderma
Etiology: caused by parasitism of the genus trichoderma.
Disease: on the body surface of the soft-shelled turtle, there are clusters of floc on the limbs, back, neck and even the head, with yellow or khaki, which is not as soft and elegant as the water mold, with a little hard wings. When the illness is serious, the limbs are brown or copper-green. A small amount of parasitism has no effect on the soft-shelled turtle, but a large number of parasites will affect the movement, feeding and even breathing of the soft-shelled turtle, causing the soft-shelled turtle to shrink and die.
Prevention and treatment:
1) before and after disinfection with 0.5ppm and 5~10ppm potassium permanganate, respectively.
2) sprinkle it all over the pond with 3ppm "Poison No.2"
3) at ordinary times, we should pay attention to the water holding not to be too fat, and keep the water quality fresh.
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Analysis on the adjustment technology of truss trawl fishing gear and fishing method
At present, the production of truss trawling shrimp has become one of the important modes of marine fishing in coastal fishing areas, and the proportion of its output value in the whole marine fishery output value is increasing year by year. As this mode of operation is a single ship bottom truss trawl operation, its gear design, assembly, operation adjustment and fishing ground selection and other links are relatively technical, so a little negligence will affect the shrimp production. In particular, the adjustment technology in truss trawl operation is the key to fishing production technology, such as this phenomenon is often encountered in production practice: the same
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How to breed shell fish
1. Selection of parent fish: the selected parent fish must be strong, the gonads are fully mature, and the female and male parent fish must be in estrus at the same time. Parent fish must have the characteristics of this species, and usually there should be intimacy between male and female parent fish. Avoid selecting tropical fish in the same nest or related by blood as parent fish, so as to prevent the quality degradation of offspring caused by inbreeding. Broken fin, crippled, deformed tropical fish are not used as parent fish. 2. The preparation of the breeding tank: due to different parent fish species, the breeding tank is also different. General tropical fish that lay floating eggs
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