Reviews in Fish Biology and Fisheries 7, 285–289 (1997) Points of view Introduction of spawning potential: improvement in the threshold management theory TO SHIO KATSUKAWA Division of Population Dynamics of Marine Organisms, Ocean Research Institute, University of Tokyo, Minamidai 1-15-1, Nakano-ku, Tokyo 164, Japan. E-mail: email@example.com Contents Introduction page 285 Does biomass really indicate the future productivity? 285 Fisher’s reproductive value 286 Spawning potential 286 Comparison between biomass threshold and SP threshold 287 Conclusion 288 Current and future usage 288 Acknowledgements 289 Reference 289 Introduction To avoid overfishing, we must maintain sufficient productivity of the fish population. Threshold or limit reference point management is widely used for this purpose. In many cases, a minimum biomass level is used in conjunction with other management measures that control exploitation above the threshold (Myers et al., 1994). In this study, I explore a possible threshold other than biomass, which to the best of my knowledge has never been examined. Does biomass really indicate the future productivity? Threshold is the minimum biologically acceptable level that ensures sustainability of the stock. Therefore threshold must serve as the criterion of the future productivity of the resource. However, it is doubtful whether biomass or spawning biomass
Reviews in Fish Biology and Fisheries – Springer Journals
Published: Oct 22, 2004
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