Freshwater shark breeding
Freshwater shark, also known as Bazhen fish, is mainly distributed in Southeast Asia. It is currently the main fish for freshwater aquaculture in Southeast Asian countries, and is also introduced into many countries and regions in Asia. At present, many domestic freshwater sharks mainly rely on foreign purchases, which limits the promotion and development of the species. In order to explore the artificial reproduction of freshwater sharks, recently, freshwater shark artificial propagation and seedling breeding experiments were conducted at the famous spa fish breeding base in Jiayu County, Hubei Province, and good results were obtained. From the results of the experiment, the survival rate of the seedlings was low, mainly because the seedling habits of the fish were not well understood. The reason should be noted as follows. Sufficient preparation of opening material: fry after the disappearance of the yolk sac, the body is particularly small, its feed requirements are very strict, it can not feed the larger size of zooplankton Cladocera and copepods, can only eat fresh hatching abundance Seedlings and Paramecium. In addition, we also conducted a number of tests, feeding fishmeal, soy milk, flour, egg yolk and other feeds failed. The final conclusion is that the diet of the fry which just hatched must be a fine zooplankton. If there are no palatable baits, they will cause serious mutual food and their losses will be heavy. Do a good job in water temperature regulation: Since freshwater sharks are tropical fish, the normal temperature for normal life is 20°C~30°C. When the water temperature drops below 18°C, the food intake and activity are significantly reduced. The water temperature continuously falls below 12°C and begins to die. In the breeding process, a cold current invaded, resulting in the death of all the blue shark seedlings in a pool and the loss of about 500,000 fry. The blue shark seedlings in the other pool are heated by the heater and the loss is small. This shows that in the seedling cultivation phase, the water temperature must be adjusted according to the requirements of the freshwater sharks on the water temperature. Prevention of water quality deterioration: due to the death of part of the insects and the deposition of feces after feeding, the fish could not be cleared in time, affecting the water quality, but water exchange could not be carried out for the purpose of heat preservation, resulting in abnormal water quality in the later period, resulting in the death of some fish fry. Fourth, the impact of power outages. During the fry cultivation, the second blackout, the power outage time twice as high as 8 hours, because of the oxygen can not be transported to the water, the water quality of oxygen, fish fry a large number of surface due to lack of oxygen, so that the fragility of the fry die. Electric Eyebrow Remover,Electric Eyebrow Trimmer,Automatic Eyebrow Trimmer,Best Electric Eyebrow Trimmer Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizon.com