Present address: Unidade Acadêmica de Garanhuns, Universidade Federal Rural de Pernambuco – UFRPE, Boa Vista, Garanhuns, 55296-015, Pernambuco, Brazil.
Otolith microstructure analysis with OTC validation confirms age overestimation in Atlantic thread herring Opisthonema oglinum from north-eastern Brazil
Article first published online: 11 NOV 2008
© 2008 The Authors Journal compilation © 2008 The Fisheries Society of the British Isles
Journal of Fish Biology
Volume 73, Issue 7, pages 1690–1700, November 2008
How to Cite
Lessa, R., Duarte-Neto, P., Morize, E. and Maciel, R. (2008), Otolith microstructure analysis with OTC validation confirms age overestimation in Atlantic thread herring Opisthonema oglinum from north-eastern Brazil. Journal of Fish Biology, 73: 1690–1700. doi: 10.1111/j.1095-8649.2008.02043.x
- Issue published online: 11 NOV 2008
- Article first published online: 11 NOV 2008
- (Received 14 September 2007, Accepted 24 July 2008)
- age and growth;
- age validation;
- oxytetracycline dyes
The daily periodicity of micro-increments in the otoliths of Atlantic thread herring Opisthonema oglinum was demonstrated from juveniles injected with oxytetracycline and reared for up to 62 days. Micro-increments ranged from 26 to 358 in the overall sample. Von Bertalanffy growth function (VBGF) using micro-increment counts were: L∞= 337 mm fork length (LF) (s.e. = 31 mm); K = 1·2 (s.e. = 0·2) and t0= 0·04 years (s.e. = 0·01 years). The otolith-based growth was corroborated using the LF frequency analysis. Observed lengths of increments were considered unsuitable for VBGF derivation, as no increase in size was obtained from them. Furthermore, the high percentage of unreadable otoliths suggests that increment analysis is unreliable for age estimation. Most growth occurs within the first year, differing from previous longevity estimates of 4–8 years. In contrast with published information, O. oglinum is a fast-growing and short-lived species.