The breeding of super-real yellow catfish is more complicated than the cultivation of super-male tilapia and requires more attention. The cultivation of super-real yellow catfish must have the following links to ensure that the super-real yellow catfish fry produced reach Standard male rate.
The success of breeding super-male yellow catfish depends largely on the control of the environmental temperature limit of the breeding environment. The environmental temperature limit is a value at which an animal tends to be male or female at a specific temperature value. Therefore, the choice of cultivation environment is particularly important. The average temperatures from April to September in Ding'an, Chengmai and other counties in Hainan Province are more suitable. Therefore, the cultivation process during the seedling stage should minimize the influence of the outside world, so that some cultivation facilities can Works well. This requirement requires that the breeding site be in a place with a more suitable temperature. In addition, temperature adjustment equipment, including insulation greenhouses and large exhaust fan systems, are essential hardware facilities in the cultivation process. of.
The selection and cultivation stage of super-male yellow catfish is generally between 70,000-80,000 per 500 grams. It depends on the breeding site, the bait mixing medium and the cultivation equipment, and then adjusted, but the general requirement is to be more than 2 cm or more. 2500 per 500 grams or more, the bait time to reach this specification may be long or short. If the temperature increases by one degree between the temperature limits, the bait time will be shortened by about one-twentieth of a day, and vice versa. There is a certain limit to the duration of feeding bait in the seedling stage, and the longer is by no means the better, because feeding the bait in the seedling stage for too long will affect the resistance of adult fish to diseases in the breeding stage. Therefore, you should always observe the growth and health of the fry in the special breeding stage and adjust the time and ratio of the bait.
During the cultivation period, some fish bodies will appear a little like the transparent back muscles. This mainly occurs in the 5-15 days of the cultivation period. This is due to the androgen in the bait taking effect at this stage. It is the critical value of hormones received by fry. The male rate of super-real yellow catfish fry continuously controlled at this stage can reach more than 95, but it is not easy to control artificially for a long time in operation. It is best to be lower than the critical value, which is approximately found in the body of the fry. It is appropriate to change the color from yellow-black to yellow-gray, so that it is easy to control the stability of the fry state during cultivation.
The cultivation of super-real yellow catfish fry must have a physical temperature control system and certain processing technology. Therefore, it cannot be done without temperature control equipment or a specific region and certain technology. In view of the fact that super-real yellow catfish is really In a false situation, seven CCTV news programs interviewed Foshan Shunde District Agricultural and Fishery Station and identified the male rate of super-male seedlings as ≥75. Before planting seedlings, you must personally inspect and select the breeding ground to identify super-male seedlings. In addition to super-male seedlings, The seedlings can also be released using all-male seedlings bred from the super-male YY broodstock of the Institute of Hydrobiology, Chinese Academy of Sciences, Hubei.