Fisheries Management Based on Reproductive Potential: An Example for Chub Mackerel
T. Katsukawa and Y. Matsumiya
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One of the main purposes of stock assessment is to evaluate the spawning stock size. Spawning stock biomass (SSB) has been generally used as an indicator of spawning stock size. However, SSB is a short-term indicator of spawning stock size, which represents the magnitude of the spawning in the coming spawning season. Because SSB cannot account for the longterm reproductive ability of the stock, fisheries management based on SSB may result in overfishing in the future. Katsukawa (1997) suggested the use of total reproductive value of the standing stock as an indicator of spawning stock size. We call this the reproductive potential. The reproductive potential can be used to evaluate the long-term reproductive ability of the standing stock, considering the biological parameters and the age composition. In this study, we have examined the performance of a fisheries management strategy based on reproductive potential. We compared the performance of constant reproductive potential strategy and that of constant SSB strategy. By deterministic analysis, we showed that fisheries management based on reproductive potential is more robust to the errors in the stock size than that based on SSB. A stochastic computer simulation also supports this result.
- Item number: AK-SG-98-01bc
- Year: 1998
- DOI: https://doi.org/10.4027/fsam.1998.55