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尼罗罗非鱼由1978年从非洲尼罗河水系和泰国引进,到80年繁殖鱼苗600多万尾,经126个单位大面积生产性试验,已普遍显示出它的优良性状。 (一)适应性强:①温度。尼罗罗非鱼喜高温,生存的水温为16～40℃,最适水温为24～35℃。对水温的最低临界温度为10℃,9℃致死;最高临界温度为40℃,40.3℃～41℃以上死亡。②氧气。引起尼罗罗非鱼窒息时的氧气为0.07～0.23毫克/升。在1.5毫克/升时能正常生长,到1.0～1.2毫克/升时才出现浮头现象,因此适应高密度放养、强化培育。③酸碱度.尼罗罗非鱼能在pH为5～10的水体中很好生长,对化肥和农药的忍受力也很强。如在水深1.5寸的稻田中饲养,每亩单独施用氯化铵30斤,硫
Nile tilapia (Tilapia niloticus), introduced from the African Nile River system and Thailand in 1978, has grown to more than 6 million fish fry in 80 years and has shown its excellent traits generally after extensive testing of 126 units. (A) Adaptability: ① temperature. Nile tilapia hi hi temperature living water temperature is 16 ~ 40 ℃, the optimum water temperature is 24 ~ 35 ℃. The lowest critical temperature of water temperature is 10 ℃, 9 ℃ lethal; the highest critical temperature is 40 ℃, 40.3 ℃ ~ 41 ℃ above death. ② oxygen. Oxygen caused by asphyxiation of Nile tilapia was 0.07-0.23 mg / L. In 1.5 mg / L when the normal growth, to 1.0 ~ 1.2 mg / L floating head appeared only when the phenomenon, so to adapt to high-density stocking, strengthen the cultivation. ③ pH value Nile tilapia can grow very well in water with pH of 5 ~ 10, and endure the fertilizers and pesticides very well. As in the water depth of 1.5 inches of paddy farming, ammonium chloride per acre alone 30 kg, sulfur