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首页> 外文会议>Symposium on Science and the Challenge of Managing Small Pelagic Fisheries on Shared Stocks in Northwest Africa >Suggestions for improving the quality of estimates of the state and trends of small pelagic fish stocks off the Northwest African coast
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Suggestions for improving the quality of estimates of the state and trends of small pelagic fish stocks off the Northwest African coast

机译：提高基于西北海岸的小型鱼鳞鱼类估算质量的建议

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Simple random sampling may result in biased age-composition of annual catch off the Northwest Africa. Design-based approach based on the best practical approximation to a probability sampling scheme is felt to be best for collection of basic biostatistical data. Investigated seasonal catch has to be compartmentalized into geographic and temporal sampling parts. The use of CPUE as a measure of abundance becomes more and more questionable due to diversification of the gears, vessels and commercial decisions about fishing locations and times in the area. Other abundance indices, not affected by time-related changes in fishing gear parameters, vessels and fishery management would be more acceptable. Good consistency in the results of young fish surveyswould indicate that they are a suitable source for the virtual population analysis (VPA) tuning. Despite a long series of acoustic surveys, acoustic methods still appear to be at an experimental stage in the region. The observed range of changes in the estimated biomass from year to year seems to be improbable. Nevertheless, on condition that the fitting technique is modified, the numerous data produced by these surveys are acceptable for use in the cohort analysis.
机译：简单的随机抽样可能导致在西北非洲的年龄锁定年龄组成。基于基于设计的方法，基于对概率采样方案的最佳实际逼近是最适合集合基本稳态数据的最佳实际逼近。调查的季节性捕获必须分别为地理和时间采样部件。由于齿轮，船只和商业决策的多样化以及该地区的时间的多样化，CPUE作为丰度的量度变得越来越有问题。其他丰富指数，不受与渔具参数，船舶和渔业管理的时间相关变化影响的影响将更加接受。年轻鱼类调查结果的良好一致性表明它们是虚拟人口分析（VPA）调整的合适来源。尽管有一系列的声学调查，但声学方法仍然是该地区的实验阶段。从年度到年度估计生物质的观察到的变化范围似乎是不可能的。然而，在修改拟合技术的条件下，这些调查产生的许多数据对于群组分析可接受。

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