島原湾コウイカかご漁場の流動環境と漁獲の関係について

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タイトル別名
  • Relationship between Current Conditions and Catch of Golden Cuttlefish Sepia esculenta in Shimabara Sound.
  • シマバラワン コウイカ カゴ ギョジョウ ノ リュウドウ カンキョウ ト ギョカク ノ カンケイ ニ ツイテ

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The catch of Sepia esculenta in Shimabara Sound may be affected by the tidal current conditions in the fishing ground. In order to collect basic data on catch variations of S. esculenta, the effect of tidal current conditions on catches of the pot fishery was investigated. The daily catch data analyzed were obtained with cuttlefish basket traps during the 1997 fishing season (20 February-28 May 1997). The tidal current was recorded over a 25-day period (22 April-22 May 1997) continuously using a current meter set at the depth 20cm above the bottom at 10minute intervals. The tidal current conditions changed periodically with the lunar fortnightly. Current velocity increased at spring tide and decreased at neap tide. Daily catch variations were closely related to the age of the moon, with the catch increasing at neap tide, and decreasing at spring tide. Tidal current is, therefore, one of important physical environmental factors that affects the entry behavior of S. esculenta toward a basket trap in a fishing ground.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 67 (3), 438-443, 2001

    公益社団法人 日本水産学会

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