期刊
FISHERIES RESEARCH
卷 119, 期 -, 页码 89-93出版社
ELSEVIER
DOI: 10.1016/j.fishres.2011.12.008
关键词
Bigeye tuna; Fisheries management; Spawner-recruitment; Steepness; Stock assessment
类别
资金
- Shanghai Leading Academic Discipline Project [S30702]
- National Natural Science Foundation of China [41106118]
- Shanghai Municipal Education Commission [12YZ134]
- Shanghai Dongfang Scholar Program
- College of Marine Sciences, Shanghai Ocean University (China)
- School of Marine Sciences, University of Maine, Orono (USA)
The impacts of the steepness parameter of the Beverton-Holt spawner-recruitment curve on fisheries stock assessment and management performance were evaluated, using data for bigeye tuna (Thunnus obesus) in the eastern Pacific Ocean. The analysis was conducted using the Stock Synthesis model. The estimates of maximum sustainable yield (MSY) and related management reference points are sensitive to the value of steepness (ranging from 0.4 to 1.0) of the Beverton-Holt spawner-recruitment relationship assumed in the assessment model. Steepness also impacts the evaluation of stock status. A lesser value assumed for steepness leads to a more pessimistic evaluation of the stock status regarding whether the stock is overfished or overfishing is occurring. However, a lesser value does not reduce the estimates of MSY due to the interaction between steepness and the estimates of other model parameters. When managing the stock under effort limitation using MSY-based fishing mortality, a lower assumption of steepness yields less expected losses in catch than does a higher assumption. This is due to the flatness of the yield curve when the steepness is high. A lower assumption of steepness also maintains a higher level of spawning biomass and recruitment. (C) 2011 Elsevier B.V. All rights reserved.
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