長崎県大村湾におけるマナマコ資源の解析

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書誌事項

タイトル別名
  • ナガサキケン オオムラワン ニ オケル マナマコ シゲン ノ カイセキ
  • Analysis of the Sea Cucumber Population in Omura Bay, Nagasaki Prefecture

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In order to analyse the dynamics of the sea cucumber, Stichopus japonicus, population in Omura Bay, Nagasaki Prefecture, Japan, the fishery data and the body weight composition data were examined. Data used were the statistics of the catch and effort by the sea cucumber dredge fishery for five fiscal years from 1978 to 1982. Collection of these data and biological measurement of the catch were conducted at Omura City Fisheries Co-operative Association located in the eastern coast of Omura Bay. The method and results obtained are enumerated as follows: 1. The outline of the sea cucumber fishery in Omura Bay was explained on the fishing season and manner etc.. The yearly variation of the total catch of the sea cucumber in Omura Bay shows a decreasing tendency after 1970. In general, the sea cucumber was commercially classified into two forms of the blue and red one. The blue sea cucumber occupied the major portion of the catch in this bay, so it was chosen as the object of this research. 2. Using the DeLury's method based on the daily catch and effort data, the initial population size, the catchability coefficient and the exploitation rate were estimated at 11.0～40.6t, 0.0015～0.0066 boat⁻¹. day⁻¹ and 63～90%, respectively. The fluctuation of these parameters by fiscal years was presented and examined. 3. The estimate of the catch efficiency by the dredge net for the sea cucumber was given 0.344 by calculating the areas of each haul and fishing ground. 4. The mean body weight of the sea cucumber was about 140g, and did not increase straightly as the fishing season progressed. The sea cucumber population was composed of many I+ and little above II+ age groups. 5. The linear regression lines of the body wall weight on the body weight, and the allometry equations of the body wall weight to the length of alimentary canal were calculated by fiscal years.

漁業協同組合の漁獲水揚伝票の整理と漁獲物の測定などから,長崎県大村湾におけるマナマコ資源について若干の知見を得た. (1)大村湾のマナマコ漁業の概要を述べた.湾内の漁獲量は1970年をピークとして,減少傾向をたどっている.マナマコはアカナマコとアオナマコに区別されるが,本報告では9割を占めるアオナマコを対象とした. (2)湾東岸に位置し,12.5km²の漁場をもつ大村市漁業協同組合新城支部より得られた,ナマコ桁網によるアオナマコの漁獲統計資料を用いた. (3)日毎の漁獲重量と出漁隻数を用いたDeLury法による解析の結果,1978～1982年度の解禁日前の初期資源重量は11.0～40.6t,漁獲能率は0.0015～0.0066,また漁獲率は63～90%と推定された. (4)操業時の曳網面積と対象漁場の面積などから,アオナマコに対するナマコ桁網の漁獲効率を0.344と算定した. (5)アオナマコの平均体重は漁期とともに増加せず,おおよそ140gであった.アオナマコ資源は1+歳が主体で,2+歳以上が若干加わっていた. (6)体重に対する殻重の一次回帰式と,消化管長に対する殻重のアロメトリー式を年度ごとに求めた.

長崎大学水産学部研究報告, v.55, pp.1-8; 1984

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