Mesh selectivity of encircling gill net for gizzard shad Konosirus punctatus in the coastal sea of Korea

:  Fishing experiments were carried out in Yeongil Bay, Korea using an encircling gill net with four different mesh sizes and two different hanging ratios to measure the mesh selectivity for gizzard shad Konosirus punctatus. Twenty-six trials were conducted giving a total catch of 485 gizzard shad. The ‘share each length's catch total’ (SELECT) analysis with maximum likelihood method was used to fit the different functional models, the normal, lognormal, and bi-normal model, for a selectivity curve to the catch data. In addition, two cases in which the relative fishing intensity was either estimated or fixed were compared. The bi-normal model with the fixed relative fishing intensity 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 3.70. From this, the focal fish lengths in the commercial encircling gill net, with mesh size ranging from 5.0 to 6.0 cm, were inferred to be 18.5–22.2 cm.

[1]  W. V. Densen,et al.  Effect of snood length and hanging ratio on efficiency and selectivity of bottom-set gillnets for pikeperch, Stizostedion lucioperca L., and bream, Abramis brama , 1994 .

[2]  P. McCullagh,et al.  Generalized Linear Models , 1984 .

[3]  S. Nishiuchi.  Mesh selectivity of hair crab pots for male hair crabs (Erimacrus isenbeckii) , 1999 .

[4]  H. Regier,et al.  Direct Estimates of Gillnet Selectivity to Walleye (Stizostedion vitreum vitreum) , 1973 .

[5]  Tadashi Tokai,et al.  Estimation of gillnet selectivity curve by maximum likelihood method , 2001 .

[6]  H. J. Buchanan-Wollaston.  On the selective Action of a Trawl Net, with some Remarks on selective Action of Drift Nets , 1927 .

[7]  D. Robson,et al.  Selectivity of Gill Nets, Especially to Lake Whitefish , 1966 .

[8]  P. McCullagh,et al.  Generalized Linear Models , 1992 .

[9]  R. Millar,et al.  Estimating the size-selection curves of towed gears, traps, nets and hooks , 1999, Reviews in Fish Biology and Fisheries.

[10]  T. Arimoto,et al.  Survival of Japanese whiting Sillago japonica and by-catch species captured by a sweeping trammel net , 2001 .

[11]  D. Wileman,et al.  The effect of twine thickness on the size selectivity and fishing power of Baltic cod gill nets , 2002 .

[12]  H. Akaike.  A new look at the statistical model identification , 1974 .

[13]  D. Shiode,et al.  Effect of thin twine on gill net size‐selectivity analyzed with the direct estimation method , 2001 .

[14]  T. Arimoto,et al.  Mesh selectivity of a sweeping trammel net for Japanese whiting Sillago japonica , 2000 .

[15]  H. Hovgård.  A two-step approach to estimating selectivity and fishing power of research gill nets used in Greenland waters , 1996 .

[16]  J. M. Hamley.  Review of Gillnet Selectivity , 1975 .

[17]  T. Kitahara.  On sweeping trammel net (Kogisasiami) fishery along coast of the San'in district-III. Mesh selectivity curve of sweeping trammel net for branquillos , 1968 .

[18]  A. Koike,et al.  Catching efficiency of trammel net with different slacknesses and mesh sizes of inner net. , 1988 .