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Foreign fish farming new trick
Music fish farming Many Japanese fish farms let fish listen to music to promote the growth of fish. Each time a juvenile fish feed is fed, a music is played so that the juveniles develop the habit of eating at the eating place when they hear the music. After the seedlings were placed in a large area of ​​fish ponds for feeding, they were each fed and continued to play the music. Changing the water temperature The method of changing the water temperature of fish farming in the experimental farm of Moscow Agricultural University of Russia can greatly accelerate the growth of the fry without changing the feed. In this method, a regulating heater is installed in the nursery pond, and by heating, the temperature of the pond water is changed within a range slightly higher than the normal water temperature of 1.0 to 1.5° C., so that the growth speed of the fry is accelerated, and the adaptability to the air temperature after the fish fry is increased. The mortality rate can be reduced by 2% to 3%. Hormone Fish The Canadian Hormone Fish Method involves adding growth hormone extracted from chickens and calves into the feed of carp fry. This allows the fish to grow faster, and the daily gain index can reach 2.38%. Salt Water Fish Farming Singapore researchers use stony salt water with a salinity of 3 to raise salmon, which can significantly increase the survival rate, fertility and growth rate of fish. Choosing fish farming The United States-Africa Fisheries Corporation uses selective breeding techniques and uses eight years to choose to breed and produce a thornless meat fish. This stingless meat fish has only one spine, and the fishbone has been completely degraded. Feeding fat feeds The Western British Fisheries Experimental Station adopts the fat feed method of fish farming. It uses semi-refined feed to add 4% to 8% of fat (either animal or vegetable oils) to feed fry, which greatly reduces the mortality rate.