망지 특성에 따른 방추형 어류의 크기 선택성에 대한 실험적 연구
An experimental study on the size selectivity of fusiform fish by the netting characteristic s
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본 연구는 트롤 끝자루에 사용하는 3가지 망지 형상(T0; regular, T45, T90)과 T0 망지의 2가지 성형률(35%, 70%)에 대해 크기 선택성을 정량적으로 평가하였다. 크기 선택성 실험은 한 변의 길이 50 cm의 정육면체 모형 어구와 실험 개체 전갱이 389 마리를 사용하여 수조에서 수행하였다. 선택성 분석은 로지스틱 함수를 사용하여 선택비를 기준으로 선택성 곡선을 작성하였으며, 25%, 50%, 70% 선택체장과 선택범위를 구하였다. T0 망지는 성형률 35%인 경우, 선택성 평가 지표인 19.54 cm, 0.51 cm로 나타났다. 성형률 70%인 경우, 22.70 cm, 3.08 cm로 나타났다. T45 망지는 24.34 cm, 2.13 cm로 나타났다. T90 망지는 23.51 cm, 2.84 cm로 나타났다. T45 망지와 T90 망지의 50% 선택체장과 선택범위는 T0 망지에 비해 상대적으로 크게 나타났으며, T45 망지와 T90 망지의 결과는 유사하게 나타났다. 망지 형상별 망목 내접원의 둘레와 실험 개체의 체동주의 관계에서는 상관관계에 유의한 차이를 나타내었다. 70% 성형률의 T0 망지와 T45 망지, T90 망지에 따른 선택비의 상관관계는 유의한 차이를 보이지 않았다. 본 연구의 결과는 일반적인 마름모꼴 망지인 T0 망지의 면적이 최대가 되는 성형률을 70%로 유지하면 T45 망지, T90 망지와 같은 선택성이 나타나는 것을 알 수 있었다.
Abstract
This study quantitatively evaluated size selectivity for three netting shapes (T0; regular, T45, T90) and hanging ratio (35%, 70%) of T0 netting used for trawl codend. The size selectivity experiment was performed in a tank using a cube experimental model with a length of 50 cm on one side and 389 experimental individuals, jack mackerel (Trachurus japonicus). In the selectivity analysis, a selectivity curve was created based on the selection ratio using a logistic function, and the 25%, 50%, and 70% selection length and selection range were obtained. The T0 netting was 19.54 cm when the 50% selective length, which is a selectivity evaluation index, had a hanging ratio of 35%, a selection range of 0.51 cm, and 22.70 cm and 3.08 cm for the hanging ratio of 70%. The T45 netting was 24.34 cm and 2.13 cm, and the T90 netting was 23.51 cm and 2.84 cm. The results of the T45 netting and the T90 netting are similar, and the 50% selection length and selection range were relatively larger than the T0 netting. There was a significant difference in the correlation between the circumference of the inner circle of the mesh by the shape of the netting and the body girth of the experimental individual (Pearson test, ). There was no significant difference in the correlation between the selection ratio by the T0 netting, T45 netting, and T90 netting with a 70% hanging ratio (one-way ANOVA, ). The results of this study showed that selectivity such as T45 netting and T90 netting appeared when the hanging ratio, which maximizes the area of T0 netting, was maintained at 70%.
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