Note

Retention of plastic-tipped dart tags in African tigerfish Hydrocynus vittatus

Published in: African Journal of Aquatic Science
Volume 42, issue 3, 2017, pages: 299–301
DOI: 10.2989/16085914.2017.1392283
Author(s): FJ JacobsMinistry of Fisheries and Marine Resources, Namibia, OLF WeylDST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa, NS LibalaMinistry of Fisheries and Marine Resources, Namibia, GC O’BrienSchool of Life Sciences, South Africa, CT DownsSchool of Life Sciences, South Africa

Abstract

Estimates of tag retention and tagging-related mortality are essential for mark-recapture experiments. Mortality and tag loss were estimated from 15 tigerfish Hydrocynus vittatus marked using Hallmark model PDL plastic-tipped dart tags released into a 1 730 m2 pond at Kamutjonga Inland Fisheries Institute, Namibia, and inspected bi-monthly for the presence or absence of tags. No mortality was observed during the experiment. All marked fish had lost their tags after 10 months and 50% tag loss was estimated at 3.9 months. The high tag loss rate indicates that PDL plastic-tipped dart tags are not suitable for long-term studies on this species.

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