Journal Article

Preliminary observations of tag shedding, tag reporting, tag wounds, and tag biofouling for raggedtooth sharks (<i>Carcharias taurus</i>) tagged off the east coast of South Africa

M.L. Dicken, A.J. Booth and M.J. Smale

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 9, pages 1640-1648
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2006.06.009
Preliminary observations of tag shedding, tag reporting, tag wounds, and tag biofouling for raggedtooth sharks (Carcharias taurus) tagged off the east coast of South Africa

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A double-tagging experiment and integrated on-site questionnaire and telephone survey were used to investigate aspects of tag shedding, tag reporting, tag wounds, and tag biofouling for the raggedtooth shark (Carcharias taurus), tagged off the east coast of South Africa. Between 2002 and 2004, 84 juvenile (<1.8 m total length, TL), and 24 adult (>1.8 m TL) C. taurus were double-tagged. Of these, 11 juvenile and six adult double-tagged sharks were recaptured. Significantly, more tags were shed from adult than from juvenile sharks, and there was also a significant difference between the number of anterior and posterior tags shed. Rates of tag reporting were estimated from a survey of 477 randomly selected shore-anglers, and they varied both temporally and spatially from 27% to 100%. In all, 93 tag recaptures were reported in the survey, most (75.3%) with some biofouling. Tag-inflicted damage was reported in 35.5% of recaptured sharks, and the incidence of tag-inflicted damage was greater for disk (77.8%) than for dart tags (25.3%).

Keywords: biofouling; Carcharias taurus; South Africa; tag reporting; tag shedding; tag wound

Journal Article.  6184 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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