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Approaches to assessing stocks of Loligo gahi around the Falkland Islands

机译：评估福克兰群岛周围的Loligo gahi种群的方法

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摘要

Management of the Falkland Islands Loligo gahi fishery is by a combination of effort control and in-season assessment of the state of the stock in relation to biological reference points. There are two fishing seasons, from February to May and from August to October inclusive. There appear to be at least two, and sometimes three cohorts that recruit to the fishery over a year, in January, April/May and October. The fishing seasons therefore do not directly coincide with the separate cohorts; the second cohort is caught in both the first and second seasons. Assessments of the cohorts were made using a Delury depletion model. In situations when a Delury could not be fitted satisfactorily, an extension was developed in which annual trends in catchability coefficients were used together with individual vessel CPUE data to estimate stock size. The Delury and its extension enabled both first and second cohorts to be assessed for all years from 1987 to 1996 Results indicated that the cohorts have different dynamics and should be considered as separate stocks. Both cohorts have been declining in size over the last several years. The significance of a transition between two distinct stocks in a single fishing season is discussed in the context of real-time management of this fishery.
机译：福克兰群岛Loligo gahi渔业的管理是结合努力控制和与生物参考点有关的种群状况的季节评估。从2月到5月以及从8月到10月（包括两个月）有两个捕鱼季节。在一年的1月，4月，5月和10月，似乎至少有两个，甚至三个队列招募到渔业中。因此，捕鱼季节与单独的队列并不直接吻合;第二个队列在第一个和第二个季节都被捕获。使用Delury耗竭模型对队列进行评估。在无法令人满意地安装Delury的情况下，开发了扩展功能，其中将可捕捞系数的年度趋势与单个船只的CPUE数据一起用于估计库存量。 Delury及其扩展使得能够对1987年至1996年的所有第一年和第二年的人群进行评估。结果表明，这些人群具有不同的动态，应将其视为独立的种群。在过去几年中，这两个队列的规模都在缩小。在该渔业的实时管理的背景下，讨论了在一个捕捞季节中两种不同种群之间过渡的重要性。

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