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Research article2024Peer reviewedOpen access

Estimating recreational trap-fishing effort for crayfish from zig-zag line transects, drone surveys and enforcement surveys

Sundblad, Goeran; de Groote, Annica; Lundquist, Peter; Larsson, Mattias; Linderfalk, Rasmus; Larson, Fredrik

Abstract

Estimates of recreational fishing effort and catch are needed to inform fisheries management, but such estimates can be challenging to obtain. We combined a zig-zag line transect survey of buoys, a fisheries enforcement survey and a drone survey to estimate recreational effort in the open-access trap fishery for signal crayfish (Pacifastacus leniusculus) in the sixth largest lake in Europe, Lake V & auml;ttern, Sweden. Using supporting variables such as size of nearby ports and bathymetry, our model-assisted estimate of total effort was 6400 (+/- 4300 CI) buoys during the three-weekend season. Using the frequency of buoys to traps as a constant, the total number of crayfish traps was estimated to be 25,500 (+/- 17,000 CI). The sampling design and methods presented are useful for ecologists and resource managers to design future multi-source surveys of recreational trap fishing effort.

Keywords

design-based estimation; inland fisheries; model-based estimation; recreational fisheries; Pacifastacus leniusculus; signal crayfish; survey sampling

Published in

Fisheries Management and Ecology
2024, Volume: 31, number: 2, article number: e12675Publisher: WILEY