Digestive Function of Tiger Puffer Compensates for Dietary Soybean Trypsin Inhibitors and Extruded Soybean Meal.

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  • 大豆トリプシンインヒビターおよびエクストルーデッド大豆油粕に対するトラフグ消化機能の適応

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The digestive compensation of juvenile tiger puffer, Takifugu rubripes, 43 g and 7 g on an initial mean body weight, for dietary soybean typsin inhibitor (SBTI) and extruded soybean meal (EX-SBM) was estimated by a short-term (25-day) and a long-term (90-day) feeding trial, respectively. In the short-term feeding trial, apparent protein digestibility and final mean body weight decreased with an increase in dietary SBTI levels, 0, 0.6, 3.0, and 6.0 trypsin inhibitor units (TIU) /mg diet. Dietary SBTI conducted smaller enteral digesta but its higher basic proteinase (BP) and SBTI insensitive BP (TI-BP) activities at 6 h after feeding on the final day of the trial. Hepatopancreatic BP and TI-BP activities did not differ among the dietary SBTI treatments at 0, 3 and 6 h after feeding. In the long-term feeding trial, 20% Ex-SBM diet conduced a lower final mean body weight than brown fish meal (BFM) diet. Whereas, in both EX-SBM and BFM diet groups, large-weight gain individuals, weighing about 1.2 times of final mean body weights, indicated higher hepatopancreas-somatic indices and hepatopancreatic BP and TI-BP activities than small-weight gain individuals, weighing about 0.8 times of final mean body weights. Moreover, the higer trend of the indice and hepatopancreatic proteinase activities was obtained in small-weight gain individuals of EX-SBM diet group than those of BFM diet group. These results suggest that tiger puffer confront dietary SBTI to promote proteinase secretion from the hepatopancreas and excrete promptly a part of digesta exceeding their digestive capacity at a relatively early time after feeding. Otherwise, the fish with large hepatopancreas and its high proteinase activities might grow faster and utilize dietary EX-SBM more effectively, as preferential traits for aquaculture seedlings.

Journal

  • Aquaculture Science

    Aquaculture Science 49 (1), 67-76, 2001

    Japanese Society for Aquaculture Science

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