トラフグ幼稚魚の成長，生残，および飼料効率に及ぼす飼育水塩分の影響

DOI 日本農学文献記事索引 Web Site 被引用文献8件 参考文献8件

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  • Effect of Ambient Salinity on Growth, Survival Rate, and Feed Efficiency in the Early Stages of Puffer Fish Takifugu rubripes.
  • トラフグ ヨウ チギョ ノ セイチョウ セイザン オヨビ シリョウ コウリツ

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In three separate experiments, the effects of salinity on growth, survival rate, and feed efficiency of the puffer fish Takifugu rubripes were studied under laboratory conditions.<br> Juveniles of 10.5±1.0mm (Exp. I), young of 37±3.5mm (Exp. II), and immature fish of 97±3.8mm (Exp. III) were reared at salinity levels of 12.8-32.0‰, 10.0-35.0‰, and 5.0-30.0‰, respectively.<br> In Exp. I, the maximal growth performance, survival rate, and feed efficiency were observed among the groups of fish reared at higher levels of salinity (25.6-32.0‰).<br> A significant high (p<0.05) in young fish (Exp. II) was obtained at the lower salinity level of 10.0‰. Poor growth was seen among the groups of fish reared at higher levels indicating a converse relation between growth and salinity.<br> In Exp. III, the optimum salinity for growth was estimated to be 15.0‰. A gradual decrease of growth were observed at lower salinities below this level.<br> These results indicate that the optimum salinity changes drastically through the early stages, and clearly reflects the habitat transits of this species under a natural environment.

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