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Title: Appraisal of the usefulness of operculum growth marks for ageing Hexaplex trunculus(Gastropoda: Muricidae): comparison between surface striae and adventitious layers
Author: Vasconcelos, Paulo
Gharsallah, Ines H.
Moura, Paula
Zamouri-Langar, Nedra
Gaamour, Adel
Missaoui, Hechmi
Jarboui, Othman
Gaspar, Miguel B.
Keywords: Adventitious layers
Age estimation
Hexaplex trunculus
Surface striae
Issue Date: 2012
Publisher: Taylor & Francis
Abstract: This study estimated the age of Hexaplex trunculus (Gastropoda: Muricidae) by analysing operculum growth marks. Surface striae and adventitious layers were counted in opercula of H. trunculus from the Ria Formosa Lagoon (southern Portugal) and from the Bizerte Lagoon (northern Tunisia), and in aquacultured individuals used for validation of the ageing technique. Operculum growth features were also compared between H. trunculus populations under contrasting environmental conditions (namely seawater temperature). Despite high inter-individual variability, all H. trunculus populations displayed a clear increasing trend in the number of striae and layers with increasing specimen size. The operculum marginal growth revealed that opercular deposition is not annual. Instead, a few growth marks are formed in the operculum each year, which was confirmed with reared specimens. In both ageing methods, considerable variation in the number of counts at a determined shell length indicates that operculum growth marks should be interpreted cautiously because they might not correspond accurately with individual age. Because of the subjectivity inherent to either method, counting striae and layers in opercula only provides rough age estimates of H. trunculus.
Peer review: yes
DOI: 10.1080/17451000.2011.616896
ISSN: 1745-1000
Appears in Collections:CESAM - Artigos
DBio - Artigos

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