Nippon Suisan Gakkaishi 72 (2), 174-181 (2006)

Mesh selectivity of gillnet for pointhead flounder Cleisthenes pinetorum

KEN-ICHI WAKAYAMA,1 YASUZUMI FUJIMORI,1 KAZUHIKO ITAYA,2
OSAMU MURAKAMI2 AND TEISUKE MIURA1

1Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611, 2Hokkaido Central Fisheries Experimental Station, Yoichi, Hokkaido 046-8555, Japan

Fishing experiments were carried out in Ishikari Bay, Hokkaido using a bottom gillnet with eight different mesh sizes to estimate the mesh selectivity for pointhead flounder Cleisthenes pinetorum. A total of 957 pointhead flounder were caught. The SELECT analysis with maximum likelihood method was used to fit the different functional models, the normal, lognormal, and bi-normal model. The catch data except for entangling catch was used for calculation. The bi-normal model was found to fit the data best. For the selectivity curve on the bi-normal model, the relative length (the ratio of fish length to mesh size) with the maximum efficiency was obtained as 1.87.


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