Stock assessment and risk analysis for the South Atlantic population of albacore Thunnus alalunga using an age-structured production model
- 作者：Punt ; A.E. ; Butterworth ; D.S. ; Penney ; A.J.
- 刊名：Oceanographic Literature Review
- 出版年：1997
- 期刊代码：64_09670653
- 类别：ear
- 出版时间：March, 1997
- 卷：44
- 期：3
- 页码：266
- 文件大小：110 K
摘要
The South Atlantic population of albacore is assessed by means of an (observation-error) age-structured production model. Relative abundance (cpue) series up to 1993 from the Republic of China, Japan and South Africa are used in the model-fitting process. The resource was estimated to be markedly depleted and to have an annual maximum sustainable yield of slightly less than 25 000 tons. Qualitatively, the results are insensitive to the changes examined. Risk analyses are carried out for a variety of future harvesting strategies. These suggest that recent average annual catches of almost 29 000 tons need to be reduced to below 25 000 tons to prevent continued depletion of the resource. It appears that there would be almost no benefit from the introduction of a minimum size in the fishery.