CATDOLL : CATDOLL: Rainbow trout has a long growth cycle. When is the best time to farm rainbow trout?

Rainbow trout with three sets of chromosomes in the cell are called triploid by preventing the second meiotic division of the zygote and then inhibiting the discharge of the second polar body through physical and chemical means. Compared with normal rainbow trout, triploid rainbow trout cannot produce sperm and eggs and has no development phenomenon because it has three sets of chromosomes to undergo meiosis. This reproduction method can avoid a series of factors such as the gonad development stage and the spawning season, and the decline in fish quality caused by energy transfer and marriage. Therefore, it has the characteristics of fast growth and good meat quality. It is the first choice for making salmon sashimi and has a high economic value. It has become a popular high-quality commodity fish in the current market.

Basic conditions for the cultivation of triploid rainbow trout

Rainbow trout is a typical bottom water cold water fish. Triploid rainbow trout has high requirements for water temperature during breeding. The maximum growth limit temperature range of adult fish is 0~30℃, of which the suitable growth temperature range is 12~20℃, especially the fastest growth in the range of 16~18℃. When the water temperature is lower than 8℃, the metabolic level of the fish is low, the food intake becomes less or no food, and the growth rate slows down. Below 4℃, the fish will not eat or grow. When the water temperature is higher than 20℃, the appetite is poor; when the temperature exceeds 22℃, feeding stops and the activity slows down. At 24℃, death begins; above 27℃, death occurs in a short time. Therefore, in the daily management process, when the water temperature is lower than 12℃ or higher than 18℃, the flow rate should be increased as much as possible to assist oxygenation and reduce or stop feeding.

Due to the large size of triploid rainbow trout, more water is needed during the breeding process, so hydroponics must be used, which is different from other freshwater fish. The optimal flow rate for breeding triploid rainbow trout is greater than 2 cm/s and less than 30 cm/s. The larger the flow, the better. The more stimulating the water flow, the more normal movement of the fish, which is good for health. It can also promote appetite, increase food intake, and accelerate growth. Appropriate flow and large flow can not only continuously supply fresh, high-dissolved oxygen aquaculture water to meet the oxygen needs of triploid rainbow trout, but also discharge fish excrement and other solid waste with the water flow of the breeding pond.

It is probably best to raise them in spring and autumn, which is also the best time to make good dates. After this time, summer and winter may be too cold and too hot respectively, so they are not suitable for breeding.

Spring and autumn are the most suitable seasons for breeding, because the temperature in spring and autumn is not particularly high, but the temperature in the cave is moderate and very suitable for the growth of rainbow trout. These two seasons are the best for breeding.

Rainbow trout should be farmed in the spring when the temperature is suitable and the survival rate is higher, so it is most suitable to farm rainbow trout in the spring.