The squid, commonly known as flower scorpion, seven-star oyster, scorpion plate, is a ferocious fish. Due to its rapid growth, tender meat and delicious taste, it has been favored as a cage and pond culture, and has developed rapidly in the coastal areas of China. In recent years, due to the drop in the price of fish, farmers have to find ways to reduce the cost of farming, in order to seek a certain profit, and the survival rate is one of the important factors affecting the cost of farming. Carp fry and juveniles have a higher mortality rate, so that the survival rate of the entire aquaculture process is generally not high, the good up to 40% -50%, the low is only about 10%. Here to talk about how to improve the survival rate:
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First, buy fry to buy fish to choose healthy, strong water resistance, neat specifications, individuals larger. In the group, because of different specifications, the “residual food†after transportation and entering the box is serious, which greatly reduces the survival rate of the entire culture process. When stocking, the size of the fingerlings should be 4 cm to 5 cm, and when the fish seedlings are grown, they must be more than 10 cm. If they are not reached, they can be raised for a period of time and then put into cages.
Second, the fry transport try to avoid the high temperature weather to transport the fish. If it can not be avoided, it can be covered with shade and ice cubes in the insulated car or car. Should pay attention to the fish density is moderate, such as the use of canvas drums about 4 cm of fish, per cubic meter of water should not exceed 3,000; oxygen bags transported with oxygen, each bag of 4 cm -5 cm fry 200 -300. If the density is too large, it will not only cause fish tailings, but also increase the “residual food†between the groups. The longer the transport time, the greater the loss.
Third, the fry release fry to the destination to carry out temperature and salinity transition domestication. Each domestication temperature difference must not exceed 2°C, and the difference in salinity must not exceed 5‰. After acclimation into the box, so that it will not be due to temperature and salinity factors resulting in reduced survival rate of fry cultivation. Before entering the box, it is best to use potassium permanganate 20ppm bath 15 minutes -20 minutes. Stocking densities, 4 cm to 5 cm in size, about 200 fish per cubic meter of water, if the stocking density is too high, they still devour one another when the group feeds while feeding, and the daily “residual food†is constantly increasing. When the water temperature is high in summer, part of the fish body will appear rotten, skin ulceration, death caused by bacterial infection, resulting in low survival rate.