Studies on freshness of trawl catches. I. Freshness of fishes just after catching under various operating conditions of trawler in the tropical waters.

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  • TSUCHIMOTO Mutsuyosi
    Laboratory of Fishery Nutritional Sciences, Faculty of Fisheries, Nagasaki University
  • UTSUGI Teruhiro
    Laboratory of Fishery Nutritional Sciences, Faculty of Fisheries, Nagasaki University
  • MISIMA Tosio
    Laboratory of Fishery Nutritional Sciences, Faculty of Fisheries, Nagasaki University
  • KITAJIMA Shunichi
    Laboratory of Fishery Nutritional Sciences, Faculty of Fisheries, Nagasaki University
  • YADA Shigeaki
    Training Vessel Nagasaki-maru, Faculty of Fisheries, Nagasaki University
  • TAKAKI Yasuaki
    Training Vessel Nagasaki-maru, Faculty of Fisheries, Nagasaki University
  • KANEHARA Hisao
    Training Vessel Nagasaki-maru, Faculty of Fisheries, Nagasaki University
  • KUNO Toshiyuki
    Training Vessel Nagasaki-maru, Faculty of Fisheries, Nagasaki University
  • SENTA Tetsushi
    Nagasaki University Nomo Fisheries Station
  • YASUDA Masato
    Nagasaki University

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Other Title
  • 熱帯海域における種々のトロール操業条件下での漁獲直後の魚の鮮度
  • 熱帯海域における種々のトロール操業条件下での漁獲直後の魚の鮮度〔英文〕
  • ネッタイ カイイキ ニ オケル シュジュ ノ トロール ソウギョウ ジョウケン

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Abstract

Freshness of fish just after catching under various operating conditions by trawlers in the tropical waters was studied, taking opportunity of experimental trawlers by T/V Nagasaki-maru in the Andaman Sea in November 1981 and in the Gulf of Thailand in October 1982. The bottom water temperatures in the fishing grounds were about 28.5°C in both the seas.<br>The mean K values of fish just after hauling up of the net were rather low; 5.6% for fish by one-hour of towing, 9.6% for fish by two-hours of towing, and 7.2% for fish by three-hours of towing. The mean K value for fish by one-hour of towing was significantly lower than those by two- and three-hours of towing, and this was also true for the same fish species caught in the same fishing ground. The distribution of K values was found to be exponential, the fish with K value of less than 10% accounting for 79.8% in one-hour of towing, 65.0% in two-hours of towing, and 80.0% in three-hours of towing.<br>The mean K values of the fish caught in the Gulf of Thailand were significantly higher than those in the Andaman Sea. A higher occurrence of trash fish both in catch per hour and in percentage of total in the former area is considered to explain this partially.<br>A negative correlation was found between the K values just after catching and the body weights of fishes, while between the K values and the increasing rates of K values we found a positive correlation.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 51 (8), 1353-1361, 1985

    The Japanese Society of Fisheries Science

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