Fisheries management of diving fishing for disk abalone Haliotis discus discus stock in Yoro, Miyazu city, Kyoto Prefecture
2019
Shinohara, Y.
The initial stock abundance and catch rate of the disk abalone Haliotis discus discus of Yoro, Miyazu City, Kyoto Prefecture were estimated using the DeLury method for stock assessment during the 2018 open season of diving fishing. In addition, a fisheries management method based on value per recruit (VPR) and the percent spawning per recruit (% SPR) analysis was assessed. The initial population was estimated to be 2,660-3,100 individuals, and the catch rate was calculated to be 0.73-0.85. When the shell length restriction changed from 100 mm, which is the present restriction, to 135.3-142.8 mm, it was estimated that the VPR was maximized and 1.45-1.56 times higher than the present. Additionally, % SPR changed from 12.3-12.8% to 41.9-59.4%, increasing beyond the overfishing level.
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