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Acceptable period for spotted mackerel <i>Scomber australasicus</i> to be rested in fish cages without feeding while still maintaining high quality

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  • TAMOTSU SEIKO
    Kagoshima Prefecture Fisheries Technology and Development Center The United Graduate School of Agricultural Sciences, Kagoshima University
  • ORITA KAZUMI
    Kagoshima Prefecture Fisheries Technology and Development Center
  • KIMURA IKUO
    The United Graduate School of Agricultural Sciences, Kagoshima University

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  • ゴマサバの蓄養可能期間の検討
  • ゴマサバ ノ チクヨウカノウ キカン ノ ケントウ

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Abstract

<p>　Spotted mackerel Scomber australasicus caught in purse seines in Kagoshima are commonly rested for a few days in fish cages without being fed so as to reduce the stress of capture. They are then killed instantaneously and distributed in Kagoshima Prefecture as high-quality sashimi (raw fish meat). We determined the acceptable period of time for which the fish could be rested unfed in fish cages while still maintaining their high quality as sashimi. To do this, we analyzed the condition factor, various body components such as plasma, and muscle properties. The content of fat in the muscle did not decrease. The content of protein in the muscle decreased. The elastic strength of the muscle was maintained until day 21. The condition factor did not decrease until day 15; it was significantly lower after day 15 than on the day when resting began. These data indicate that spotted mackerel can be rested unfed in fish cages for up to 15 days before their quality as sashimi declines.</p>

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