Effect of Diversity of Fish Landings on Sorting Time in Stick-held Dip Net Fishery

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  • イワシ棒受網漁業の水揚げ物の多様度が選別作業時間に与える影響

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<p>This study aimed to clarify the effect of the amount and composition of the fish landings on the sorting time of a stick-held dip net fishery through field surveys conducted at the Akune fishing port. The names of the fishing boats, the start and end time of the sorting process, and the number of people involved in the sorting were recorded by visual observation. Landing slips issued by the Kitasatsuma Fisheries Cooperative located at the Akune fishing port were obtained to analyze the amount and composition of the fish landings. The slips showed the names of the fishing boats and the number of boxes for each species and size as well as those for aquaculture bait. The Simpson index (λ) was used to indicate the complexity of the composition in the fish landings. The regression formulas obtained in this study showed that the sorting time per catch weight was greater when λ was larger, suggesting that sorting process can be improved more effectively when λ decreases.</p>

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