Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Recreational and semi-subsistence fisheries are challenging to monitor but can act as precursors of developments in commercial fisheries, contributing information in data-limited situations. We compared trends in commercial landings of Norway lobster (Nephrops norvegicus) with data collected through a citizen science project by recreational fishers in Norway during a period that coincided with the onset of a commercial trap fishery. The results show that trap fishing for Nephrops emerged recently in Norway, with significant regional differences in size composition and catch rates. Comparable patterns in catch rates between regions were found in commercial landings during the same period, suggesting that landings per boat trip may provide a suitable abundance index in a severely data-limited fishery. Our study indicates that recreational fishing acted as trailblazer for a surge in fishing with lower-impact gear along the Norwegian coast, underscoring the fact that non-commercial fisheries may act as early indicators of emerging commercial fisheries. Collecting information through citizen science projects targeting non-commercial fishers can therefore provide baseline data, especially from the earliest, unmonitored stages of fisheries, and contribute to stock assessment.

中文翻译：

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将休闲捕鱼纳入数据有限的种群：挪威龙虾 (Nephrops norvegicus) 的案例研究

加拿大渔业和水生科学杂志，印刷前。
休闲和半自给渔业难以监测，但可以作为商业渔业发展的先驱，在数据有限的情况下提供信息。我们将挪威龙虾 (Nephrops norvegicus) 的商业上岸趋势与挪威休闲渔民通过公民科学项目收集的数据进行了比较，该数据恰逢商业陷阱渔业的开始。结果表明，挪威最近出现了针对 Nephrops 的陷阱捕捞，其大小组成和捕获率存在显着区域差异。在同一时期的商业上岸量中发现了区域间捕捞率的可比模式，这表明每次游船的上岸量可能在数据严重受限的渔业中提供合适的丰度指数。我们的研究表明，休闲捕鱼是挪威海岸使用低影响渔具捕鱼激增的先驱，强调了非商业渔业可能成为新兴商业渔业的早期指标。因此，通过针对非商业渔民的公民科学项目收集信息可以提供基线数据，尤其是来自渔业早期、未监测阶段的数据，并有助于种群评估。