강원 연안 겨울 도루묵(Arctoscopus japonicus) 수컷의 자망에 대한 어획선택성
Size Selectivity of Gill Net for Male Japanese Sandfish (Arctoscopus japonicus) off Gangwon in winter
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Abstract
We describe a catch experiment and the size selectivity of gill nets for male Japanese sandfish (Arctoscopus japonicus) caught near Gosung, Korea. The experiment, which was conducted between October and December 2007, examined six different mesh sizes: 36.4, 39.4, 45.5, 51.5, 53.0, and 57.6mm. The catch was mostly Japanese sandfish (91.3%) and some others (8.7%). More male Japanese sandfish were caught with smaller mesh sizes and more females with larger mesh sizes. Relationships between the weight and fork length of the male and female Japanese sandfish were obtained. The relationship between the catch (Y) and mesh size of the gill net (X) was Y=0.1773X3-5.3753X2+40.042X+26.846 (R2=0.99). The selection curve for male Japanese sandfish caught in the experiment was fit, via Kitahara's method, to a polynomial equation, which was s(R)=exp{(-2.1391 R3+24.294 R2-88.289 R+105.5)-5.180}, where R=l/m, and l and m are the fork length and mesh size, respectively.
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