Directional bilateral asymmetry in otolith morphology may affect fish stock discrimination based on otolith shape analysis

Type Article
Date 2019-01
Language English
Author(s) Mahe KeligORCID1, Ider Djamila2, Massaro Andrea3, Hamed Oussama4, Jurado-Ruzafa Alba5, Goncalves Patricia6, Anastasopoulou Aiketerini7, Jadaud AngeliqueORCID8, Mytilineou Chryssi7, Elleboode Romain1, Ramdane Zohir2, Bacha Mahmoud9, Amara Rachid9, de Pontual HeleneORCID10, Ernande BrunoORCID1
Affiliation(s) 1 : Fisheries Laboratory, IFREMER, 150 Quai Gambetta, BP 699, 62 321 Boulogne-sur-Mer, France
2 : Laboratoire de Zoologie Applique´e et d’Ecophysiologie Animale, Universite´ Abderrahmane Mira, Be´jaý¨a, Algerie
3 : APLYSIA – Via Menichetti 35, 27121 Livorno, Italy
4 : Universite´ de Tunis El Manar, Campus Universitaire, 2092 El Manar II, Tunisie
5 : Instituto Espa~nol de Oceanografý´a, Centro Oceanogra´fico de Canarias, 38180 Santa Cruz de Tenerife, Spain
6 : Departamento do Mar e Recursos Marinhos, Intituto Portugueˆs do Mar e da Atmosfera (IPMA), Lisboa, Portugal
7 : Hellenic Centre for Marine Research, PO Box 712, P.C. 19013, Anavyssos Attiki, Athens, Greece
8 : Fisheries Laboratory, IFREMER-UMR MARBEC, Avenue Jean Monnet, CS 30171, 34203 Se`te Cedex, France
9 : Laboratoire d’Oce´anologie et de Ge´osciences, Universite´ Littoral Coˆte d’Opale, Univ. Lille, CNRS, UMR 8187, LOG, F 62930 Wimereux, France
10 : IFREMER, Sciences et Technologies Halieutiques, CS 10070, 29280 Plouzane´, France
Source Ices Journal Of Marine Science (1054-3139) (Oxford University Press (OUP)), 2019-01 , Vol. 76 , N. 1 , P. 232-243
DOI 10.1093/icesjms/fsy163
WOS© Times Cited 34
Keyword(s) Boops boops, elliptical Fourier analysis, Mediterranean Sea, side effect, stock identification

Otolith shape analysis is an efficient fish stock identification tool. However, most applications used left and right otoliths or only one of them arbitrarily chosen without testing for biases resulting from potential directional bilateral asymmetry (DA) in otolith shape, i.e. a unimodal population-level deviation form bilateral symmetry between right and left otolith shapes. In this study, 560 bogues (Boops boops) were sampled from 11 geographical locations from the Canary Islands to the Aegean Sea and elliptical Fourier descriptors were used to describe their otoliths’ shape. First, a significant otolith DA was observed at the global scale with an average amplitude of 2.77%. However, at the scale of sampling locations, DA was not always significant and varied in amplitude and direction. Second, population structure was investigated using the shape of either right otoliths or left otoliths or both together. Analyses based on right otoliths or both otoliths together, suggested three stock units: a North-Western Mediterranean Sea stock, an Eastern Mediterranean Sea stock, and a Central-Eastern Atlantic Ocean and South-Western Mediterranean Sea stock. In contrast, no coherent geographical pattern was found based on left otoliths. Our results highlight the importance of accounting for potential otolith DA in otolith shape-based stock identification.

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Mahe Kelig, Ider Djamila, Massaro Andrea, Hamed Oussama, Jurado-Ruzafa Alba, Goncalves Patricia, Anastasopoulou Aiketerini, Jadaud Angelique, Mytilineou Chryssi, Elleboode Romain, Ramdane Zohir, Bacha Mahmoud, Amara Rachid, de Pontual Helene, Ernande Bruno (2019). Directional bilateral asymmetry in otolith morphology may affect fish stock discrimination based on otolith shape analysis. Ices Journal Of Marine Science, 76(1), 232-243. Publisher's official version : , Open Access version :