クロマグロおよびマサバ稚魚における消化率とエネルギー分配

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  • Apparent Digestibility Coefficient and Energy Partition of Juvenile Pacific Bluefin Tuna, Thunnus orientalis and Chub Mackerel, Scomber japonicus

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Apparent digestibility coefficients (ADCs) and energy partition of juvenile Pacific bluefin tuna (PBT) and chub mackerel were preliminarily estimated using a moist pellet, mixing with minced sand lance and a fish meal diet. ADCs for dietary nutrients and energy in PBT at 26-28°C were ca. 5-10% lower than those of mackerel at 23-25°C. Energy partitions of PBT and mackerel were assayed under various feeding protocols at 24-25°C and 26°C, respectively, and expressed as per kg body weight/day. In PBC, energy intake (EI) was 1452 and 5173 kJ under 3-day fasting followed by 2-day feeding to satiety (3dF: 2dS) and 5-day feeding to satiety (5dS), respectively. Energy for metabolism (ME) was 481 kJ under fasting for 5-day rearing period (5dF) . Energy retention (ER) was -481, -247 and 381 kJ under 5dF, 3dF: 2dS and 5dS, respectively. In mackerel, EI was 448, 917 and 1197 kJ under 6dF: 3dS, 3dF: 6dS and 9dS, respectively, and ME was 208 kJ under 9dF. The ER was -230, 3.35, 197 and 439 kJ under 9dF, 6dF: 3dS, 3dF: 6dS and 9dS, respectively. These results indicated that lower ADCs and ER of PBT than those of mackerel were due to their insufficient digestive potency for heat damaged fish meal.

収録刊行物

  • 水産増殖

    水産増殖 55 (4), 571-577, 2007

    日本水産増殖学会

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