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Temperature-regulated fish farming Moscow agricultural experts have successfully developed a new method for regulating fish temperature and fish culture, which has greatly accelerated the growth rate of fish fry without changing the fish feed. The method is to install a regulating heater in the nursery pond to heat the pool water. When the water temperature drops to normal, the water is continuously circulated and heated so that the temperature difference of the water temperature of the pool water often varies within a range of 1°C to 1.5°C, so that the growth rate of the fry is increased. Accelerating 40% or so also makes the adaptability of the water temperature to the fish fry better, and the mortality rate is greatly reduced.
Choosing fish farming Aquaculture experts in Florida, USA, use selective breeding techniques. A fish called Della Pichia grows into a stingless meat fish. This fish has only one spine, and all the fishbone are degraded. When meat is eaten, it is not. Then, with a thorn, a female can breed about 6,000 fry a year, and the adult fish weighs about two pounds. The meat tastes delicious. This stingless meat fish has been promoted in the country.
Salt water fish farming Singapore scientists use a brackish water with a salinity of 3% to raise young juvenile fish. In addition, 0.01PPM of urea is added to the feed of juvenile squid to make microcapsules. Feeding can increase the fish's appetite and significantly increase the survival rate, fertility and growth rate of the juvenile carp.
Hormone Fish Canadian biologists use hormones to fish. Extraction of growth hormone hormones from chicks and calves into feeds fed with salmon fry resulted in a doubling of fish growth and a daily gain index of 2.38%. U.S. scientists also extracted growth hormone from fish and transplanted it so that the growth hormone could be produced twice as much in the body of the hormone-implanted fish, increasing the fish's daily weight gain by more than 50% and promoting the growth rate of the fish.
Five cases of exotic fish farming abroad
Musical fish farming Japan has adopted a method that allows fish to listen to music and promotes the growth of fish, while at the same time developing a new method that facilitates the capture of adult fish. After artificial hatching of fish eggs, each time feeding juvenile fish bait is accompanied by a kind of music, so that juvenile fish formed to hear this music, they go to the eating habit of eating. The juveniles are stocked in a large area of ​​fish ponds, and the music is still accompanied by the fish when it is eaten, so that the fish can be concentrated in the feeding place. When catching fish, as long as the music is accompanied, the fish will come to the feeding place as usual, and it is convenient to catch.