Acoustic telemetry suggests the lesser spotted dogfish Scyliorhinus canicula stays and uses habitats within a French offshore wind farm

Offshore wind farms (OWF) are a rapidly expanding renewable energy source, but their effects on marine wildlife need further investigation. These infrastructures form new artificial habitats that may modify the behaviour and spatial distribution of fish species. Among the species likely to be affected, benthic sharks occupying coastal habitats are particularly exposed to the development of OWF, especially as electrosensitive species. This study used passive acoustic telemetry to investigate the behaviour of a benthic shark, the lesser-spotted dogfish Scyliorhinus canicula, within France's first operational OWF. Most tagged sharks remained in the vicinity of the OWF post-release, exhibiting site fidelity and seasonal residency with reduced presence during winter when water temperatures are the lowest. The primary site frequented is a monopile with scour protection on soft substrate, offering potential shelters and food sources. This study provides new insights into the species' ecology and contributes to improving our understanding of how anthropogenic structure installation in the marine environment affects the behaviour of S. canicula. •Acoustic telemetry was used to investigate lesser-spotted dogfish Scyliorhinus canicula behaviour in offshore wind farm.•S. canicula was less likely to be detected at the study site in winter.•S. canicula exhibited site fidelity, with individuals returning to the offshore wind farm after several weeks of absence.•S. canicula was mostly detected in the vicinity of the monopile equipped with scour protection.•Results suggest that habitats within the offshore wind farm are suitable for S. canicula.