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Advances in tagging syngnathids, with the effects of dummy tags on behaviour of Hippocampus guttulatus

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Artificial marking and tagging techniques have been used to study movement, population dynamics, behaviour, ecology, survival and growth of at least 25 syngnathid species. External necklace-style tags and injection of visible implant elastomer have been the most used techniques, uniquely identifying hundreds of individual syngnathids to study population dynamics, mortality, behaviour, ecology and growth in at least 13 and 12 species, respectively. Only two studies, both on larger syngnathid species, have tested the use of internal or electronic tags. This new case study reveals that dummy tags, weighing up to 6% of individual body mass, have minimal effect on normal ex situ behaviour of the long-snouted seahorse Hippocampus guttulatus, a smaller syngnathid. In paired aquarium trials, tags did not affect movement, holdfast use or general behavioural state, and only had a short-term effect (1 day) on vertical orientation. Tagged H. guttulatus gained more mass during the 5 day trials, a result which warrants further exploration but indicates that tags did not reduce feeding. This study shows promise for using electronic tagging to study H. guttulatus and similarly sized syngnathids in the wild.
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Keywords: acoustic telemetry; aquarium; movement; seahorse; visible implant elastomer; welfare

Document Type: Editorial

Affiliations: 1: CCMAR, Universidade do Algarve, FCMA, Campus de Gambelas, Faro 8005-139, Portugal 2: Project Seahorse, Fisheries Centre, The University of British Columbia, 2202 Main Mall, Vancouver, BC, V6T 1Z4 Canada

Publication date: 2011-06-01

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