Estimation of Exploitation Rate in Different Shell Size Groups of the Spiny Top Shell, Batillus cornutus, in a Free Diving Fishery.

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A tagging experiment was performed to estimate the exploitation rate in three shell size groups. A total of 1881 tagged shells, ranging from 59 to 110 mm in shell height, were released in an experimental area of 200×200m. Exploitation rates for three groups, large, medium and small size, were estimated from the release-recapture data. The highest rate was attained in the large size group during the former half of the fishing season (14 days fished) and in both the large and medium size groups during the latter half of the season (17 days fished), indicating the size selection of capture. A trend that the shell size in 50% retention of capture decreased as the fishing effort increased, was observed. This fact suggested that the size selection was closely related to magnitude of the total effort in the fishing ground.
日本水産増殖学会の論文