Gap analysis and review of survey effort disruption in North Sea and North-eastern Atlantic bottom trawl surveys DOI Creative Commons
Anna K. Stroh, David L. Stokes, H.D. Gerritsen

et al.

ICES Journal of Marine Science, Journal Year: 2025, Volume and Issue: 82(2)

Published: Feb. 1, 2025

Abstract Fisheries-independent surveys are essential to stock assessment, providing estimates on relative abundance, distribution, and biology of commercially fished species. Environmental, mechanical, logistical issues can disrupt survey operation reduce effort. We synthesized causes disruptions using 25 years publicly available records for North Sea North-eastern Atlantic bottom trawl operations. assigned each recorded disruption one three categories: Spatial—long-term (e.g. windfarms, marine protected areas), Spatial—short-term fisheries, legal issues), random spatial processes weather mechanical issues). Furthermore, we analysed spatiotemporal patterns effort targets identified in the protocols North-East Atlantic. Lastly, conducted a case study Irish (IGFS) explore effect weather, time, geographic position probability sampling an IGFS station binomial generalized additive model. On average, number stations sampled was lower than indicated protocol surveys. Weather had consistent effects all surveys, implying that their designs vulnerable influence environmental factors. However, neither storminess (using wave height as proxy) nor location reliable predictor survey. provide framework analysing robustness disruption. Our approach could be used future monitor changes relation protocols, facilitating critical evaluation design efficacy.

Language: Английский

Gap analysis and review of survey effort disruption in North Sea and North-eastern Atlantic bottom trawl surveys DOI Creative Commons
Anna K. Stroh, David L. Stokes, H.D. Gerritsen

et al.

ICES Journal of Marine Science, Journal Year: 2025, Volume and Issue: 82(2)

Published: Feb. 1, 2025

Abstract Fisheries-independent surveys are essential to stock assessment, providing estimates on relative abundance, distribution, and biology of commercially fished species. Environmental, mechanical, logistical issues can disrupt survey operation reduce effort. We synthesized causes disruptions using 25 years publicly available records for North Sea North-eastern Atlantic bottom trawl operations. assigned each recorded disruption one three categories: Spatial—long-term (e.g. windfarms, marine protected areas), Spatial—short-term fisheries, legal issues), random spatial processes weather mechanical issues). Furthermore, we analysed spatiotemporal patterns effort targets identified in the protocols North-East Atlantic. Lastly, conducted a case study Irish (IGFS) explore effect weather, time, geographic position probability sampling an IGFS station binomial generalized additive model. On average, number stations sampled was lower than indicated protocol surveys. Weather had consistent effects all surveys, implying that their designs vulnerable influence environmental factors. However, neither storminess (using wave height as proxy) nor location reliable predictor survey. provide framework analysing robustness disruption. Our approach could be used future monitor changes relation protocols, facilitating critical evaluation design efficacy.

Language: Английский

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