Abstract
Comparative fishing trials were undertaken with two commercial collapsible pots for the crab Charybdis japonica. One pot was box-shaped with two slit entrances at the ends, while the other was dome-shaped with two open funnel entrances. Pots were placed at the bottom of a pond that is connected to Kagoshima Bay. Fishing trials were carried out using a 1-day soaking time; the bait used was mackerel. The box-shaped pot had higher catches of crabs and non-target organisms, ***DIRECT SUPPORT *** A02OT006 00004 but the number of large crabs (carapace width \s>8 cm) was almost half as many as that caught with the dome-shaped pot. The catch of non-target species was also greatly reduced in the dome-shaped pot, and fish caught were mostly enmeshed in the netting. The reduction in catches of small crabs and non-target organisms was due to the nature of the dome-shaped pot’s larger mesh size and open entrances, which allowed for escape. The dome-shaped pot seemed more efficient for harvesting commercial size crabs, while the box-shaped pot seemed better for removing all crab sizes.
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Vazquez Archdale, M., Kuwahara, O. Comparative fishing trials for Charybdis japonica using collapsible box-shaped and dome-shaped pots. Fish Sci 71, 1229–1235 (2005). https://doi.org/10.1111/j.1444-2906.2005.01087.x
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DOI: https://doi.org/10.1111/j.1444-2906.2005.01087.x