What are the fish's requirements for water temperature?
Mud carp require higher water temperature in the living environment. The optimum temperature for reproduction is 2630 ℃, and the optimum temperature for feeding is 14.6-29.4 ℃. At this time, mud carp have a strong appetite. If the water temperature is too high or too low, the feeding intensity will be reduced. The cold resistance of mud carp is poor, and a large number of mud carps die when the water temperature drops to 6 ~ 7 ℃. Therefore, the overwintering heat preservation measures should be taken for mud carp culture, and the area of mud carp culture is limited by temperature.
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Scientists find toxins that increase the toxicity of Metarhizium anisopliae
Researchers from the Institute of Plant Physiology and Ecology of the Chinese Academy of Sciences (InstituteofPlantPhysiologyandEcology) and the Department of Entomology of the University of Maryland in the United States have discovered a neurotoxin that can promote the virulence of insecticides, which provides important data for the application of this insecticide and the study of the mechanism of fungal insecticides and the molecular mechanism of fungal-insect interaction. The results of the study are published in NatureBiotechnol
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Three methods of fishing natural eel seedlings
There are mainly the following three fishing methods: 1. The net is in the shape of a trumpet tube, with a general length of 9 meters and a perimeter of 6-7 meters, which can be woven with polyethylene thread. The net port gradually shrinks from the net port to the back end, and the end of the net port is connected with a floating seedling collecting box. Set seedling box mesh 50-60 mesh. Zhang Wang should be set on the beach far away from the sluice to collect eel seedlings with the trend. It can be caught at high tide and low tide. Two people worked, one rowed the boat, and the other regularly lifted the seedling box with a small white porcelain basin and scooped out the eel.
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