Abstract.In temperate regions of North America, the culture of rainbow trout,Oncorhynchus mykiss(Walbaum), in ponds is constrained to the period mid‐November to early April by water temperature. Feeding practice may influence production time. The effects of three feeding practices on growth and body composition of rainbow trout raised in ponds during a 142‐day winter growth period were investigated. Feeding practices were (1) hand‐feeding to satiation, (2) feeding according to a fish size/water temperature chart, and (3) feeding by demand feeder.Fish fed to satiation consumed 66 more diet than fish fed according to a feeding chart and 163 more than fish fed by demand feeders. Fish fed to satiation had significantly higher (P0·05) in percentage body fat or feed conversion ratio (FCR) compared to the other two treatments. Survival percentage did not differ significantly (P>0·05) between treatments. These data indicate that by using satiation feeding, marketable size rainbow trout can be produced in temperate region ponds without increases in percentage body fa
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机译:Abstract.In 北美洲的温带地区,池塘中虹鳟鱼(Oncorhynchus mykiss(Walbaum)的养殖受水温限制在11月中旬至4月上旬。喂食方式可能会影响生产时间。研究了3种投饵方式对142 d冬季生长期池塘中养殖的虹鳟鱼生长和身体成分的影响。饲喂方式是(1)人工喂食至饱腹感,(2)根据鱼的大小/水温表喂食,以及(3)按需喂食器喂食。根据饲喂图表,饱腹的鱼比喂食的鱼多消耗 66% 的日粮,比按需喂食者喂食的鱼多 163%。与其他2个处理相比,饲喂饱食鱼的增重、收获重量、比生长速率和蛋白质增重显著高于(P0·05)。不同治疗组的生存率差异无统计学意义(P>0·05)。这些数据表明,通过使用饱食饲喂,可以在温带池塘生产适销对路规格的虹鳟鱼,而不会增加体百分比 fa
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