Effects of the time schedule on a stock management process
2016
Yoda, M. (Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Nagasaki (Japan)) | Watanabe, C. | Yukami, R. | Fukuwaka
This study examined the effect of the information update and assessment schedule on the management performance for a small pelagic fish by simulation using an age structured population dynamic model for the Tsushima Warm Current stock of jack mackerel Trachurus japonicus. Currently, stock assessments are conducted annually and annual allowable biological catch (ABC) is estimated based on the data obtained up to two years before by the Japanese Government. Due to the short lifespan of jack mackerel and characteristics of its targeting fishery, the proportions of fish at 0 year old and at 1 year old in the catch of jack mackerel are relatively higher than those of other species managed by catch amount regulations in Japan. The predicted annual recruitment constitutes a large part of jack mackerel stock biomass, which is the basis of the ABC calculation. Our results show that short-term forecasts of recruitment are effective for reducing the risk of management failure, and suggest the management performance could be improved by reassessing and revising the ABC.
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