Effects of dry pellets containing astaxanthin and squid meal on the spawning performance of striped jack Pseudocaranx dentex.

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  • VASSALLO-AGIUS ROBERT
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • WATANABE TAKESHI
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • IMAIZUMI HITOSHI
    Komame Station of Japan Sea Farming Association
  • YAMAZAKI TETSUO
    Komame Station of Japan Sea Farming Association
  • SATOH SHUICHI
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • KIRON VISWANATH
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries

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Abstract

This study was conducted to investigate the effect of squid meal and astaxanthin in dry pellets on the spawning performance of striped jack. Two groups of 8-year-old fish with an average bodyweight of 3.5±0.4 kg were used. The control group was fed a raw fish mix (RF) and the experimental group was fed steam dry pellets (as-DP) containing 10 p.p.m. astaxanthin and squid meal, the latter replacing half the fish meal. Each group was fed once a day, three times a week in floating net cages for a period of 5 months. Seven females and seven males were selected from each group and transferred to 65 m3 indoor concrete tanks for spawning, where they were kept at optimum spawning conditions (22°C) for 1 month. The average bodyweights of selected fish were 3.8±0.5 kg and 3.8±0.6 kg for the RF and as-DP groups, respectively. Both groups spawned a total of 18 times and the mean total egg production and egg quality, measured in terms of buoyancy, fertilization and hatching rates, showed no significant differences (P>0.05) between groups. Total larval production was 679.9×103 and 678.1×103 larvae/kg-female for the RF and as-DP groups, respectively. These results show that the combination of astaxanthin and squid meal in dry pellets for striped jack broodstock improved the overall spawning performance to a level similar to that of fish fed on RF.

Journal

  • Fisheries science

    Fisheries science 67 (4), 667-674, 2001

    The Japanese Society of Fisheries Science

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