牛脂添加の低タンパク・高カロリ-飼料によるニジマスの長期飼育

概要

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A long-term feeding trial was conducted on a relatively large scale to determine whether the low protein diet (35%) with a high energy value (18% lipid containing beef tallow as a main energy source and ω3HUFA at 10% of dietary lipid which satisfies the EFA requirement of rainbow trout) is effective for normal growth of rainbow trout at each stage of their development, i.e. fingerlings, adult fish and spawning parent fish. Another experiment was also conducted to examine the effect of total deletion of trace metals from the mineral mixture in fish meal diets on growth of the fish. The results showed that the low protein diet of high energy density was available for all stages of development in rainbow trout and EFA requirement did not change through these stages. On the other hand, the fish fed on the diet without supplement of trace elements showed a high mortality rate and suffered from heavy cataracts and short body dwarfism, indicating that the availability to rainbow trout of trace elements contained in white fish meal is low.
日本水産學會の論文