アロツナスAllothunnus fallaiに対する流し網の網目選択性〔英文〕

概要

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Selectivity curves for Allothunnus fallai were estimated from 44 fishing operations in the South Pacific from November 1985 to February 1986, using 104, 125, 150, 180 and 216mm mesh nylon multifilament gill nets. The ratio of optimum fish length to the particular mesh size was 4.20 for a site in December, 4.53 for sites in November and 4.47 for all sites combined. Although selectivity curves differed by fishing area and/or date in their optimum fish length and in the slope of their descending arms which were gentler than previously reported ones for various fishes. The infra- and inter specific differences in present selectivity curves were discussed in relation to con-dition factor (fatness) of fish and position of mark by mesh on fish.
日本水産學會の論文