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养殖虹鳟鱼的最适宜水温在15～18℃.高于20℃时鱼的摄食强度下降.当水温高达25℃时鱼呼吸困难,几乎不能进食.如果这一水温持续时间长,鱼就会大量死亡.冬季水温为1～3℃时虹鳟鱼照常摄食.在昼夜平均水温不高于13℃的水域中,虹鳟鱼才能正常成熟并形成产卵亲鱼群.为确保鱼正常生长,水中溶氧量应为7～8毫克/升.当溶氧量降到5毫克/升时,鱼呼吸困难,饵料消耗能力和生长速度下降.
The optimum water temperature for raising rainbow trout is 15 ° C to 18 ° C. The fish’s feeding intensity is lowered above 20 ° C. The fish can hardly breathe when the water temperature is as high as 25 ° C. If this water temperature lasts long, Death.White rainbow trout was fed as usual when the water temperature was 1 ~ 3 ℃ in winter.The rainbow trout could mature normally and form the spawning parent fish in the water with the average day and night water temperature less than 13 ℃ .In order to ensure the normal growth of fish, Should be 7 ~ 8 mg / L. When the dissolved oxygen dropped to 5 mg / L, fish breathing difficulties, food consumption and growth rate decreased.