Current status of tagging harbour porpoises - aplication to the Dutch North Sea : knowledge base report

Abstract

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Feasibility study for a pilot program: catching and tagging harbour porpoises in the Netherlands

“…This allows for time-at-depth histograms, depth profiles and maximum dive depths. The extra sensor does increase the size and weight of the tag, and reduces battery life, see also (Vrooman et al, 2022). Measuring depth is currently only an option for the Wildlife Computers SPLASH tags and the K2F 173A LOTEK tag.…”

“…Per subject, different options will be explored and discussed, including pros, cons and overall feasibility. Information will be gathered from literature, earlier reports (Ministry of Agriculture, Nature and Food Quality & Rijkswaterstaat (Wozep), 2022; Scheidat et al, 2016;Vrooman et al, 2022), expert opinion and expert experience. This will converge into a final recommendation to guide a decision on whether, and how, to proceed with the project.…”

“…There are various types of tags on the market that can be used for telemetry research, with different types of attachment, sensors and specifications (also see (Debets, 2023;Vrooman et al, 2022)). Since the first research priority from a policy perspective concerns the large scale movements and habitat preference in the southern North Sea, this chapter will only focus on tags that can provide information about that: tags that stay attached relatively long-term (at least weeks) 1 , and transmit information through the use of satellites 2 .…”

Effect of electromagnetic fields generated by Borssele export cables on harbour porpoise acoustic actvity

“…This can be done by tracking animals. Methods to track porpoises are tagging of animals (see Scheidat et al, 2016;Vrooman et al, 2022 for a review) or acoustically detecting animals by arrays with multiple synchronized hydrophones (see Scheidat et al, 2019 for a review).…”

“…In the pilot porpoises from rehabilitation that will be released in the North Sea will first be tagged. In the future possibilities to catch and tag porpoises at sea will be explored (Vrooman et al, 2022). If the latter succeeds, however.…”