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Discriminant Geographic Variation of Saccular Otolith Shape and Size in the Common Pandora, Pagellus erythrinus (Sparidae) across the Gulf of Gabes, Tunisia

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Abstract

A total of 243 Pagellus erythrinus saccular otoliths’ shape and size, including length, width, area, and perimeter, were examined among individuals of the Chebba, Sfax, Gabes, and Zarzis stations located in the Gulf of Gabes, Tunisia. The objective was to assess the geographic variation in the otoliths' shape and size and the effect of potential fluctuating asymmetry in otolith size on the stock structure of P. erythrinus individuals from these stations. Analysis of the otolith shape showed a statistically significant difference (Wilks’ λ = 0.1661, p < 0.0001), i.e., asymmetry, in the left and right otoliths shape among individuals of the four stations, as well as among those within the Chebba and Gabes stations. Besides, a significant shape difference was observed in the left-left and right-right otoliths among individuals of both Chebba and Gabes, Chebba and Zarzis, Gabes and Sfax, Gabes and Zarzis, and Sfax and Zarzis stations. Moreover, a significant fluctuating asymmetry was detected in width between the left and right otoliths only among individuals of the Sfax and Gabes stations. Discriminant function analysis of the otoliths’ contour shape confirmed the presence of three separate main stocks, one corresponding to the Chebba and Sfax stations, the second representing Gabes, and the third characterizing Zarzis, which should be managed separately.

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ACKNOWLEDGMENTS

We are grateful to all teams in the laboratory of ecology, biology, and physiology of aquatic organisms of the Faculty of Sciences of Tunis who helped to improve the quality of the manuscript.

We also thank the anonymous reviewers who reviewed our paper for their very informative and helpful comments that improved the manuscript.

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The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

  1. Laboratory of Ecology, Biology and Physiology of Aquatic Organisms, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia

    M. Mejri, W. Bakkari, M. Tazarki, J.-P. Quignard, M. Trabelsi & A.R. Ben Faleh

  2. Institut Supérieur de Pêche et d’Aquaculture de Bizerte, Errimel, Bizerte, Tunisia

    M. Mejri & S. Mili

  3. Unité de Génétique des Populations et Ressources Biologiques, Faculté des Sciences, Tunis, Tunisia

    A. Chalh

  4. Department of Zoology, Faculty of Science, Minia University, El Minia, Egypt

    A. A. B. Shahin

  5. Laboratoire d’Ichtyologie, Université Montpellier II, Montpellier Cedex, France

    J.-P. Quignard

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  1. M. Mejri
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  9. A.R. Ben Faleh
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Correspondence to M. Mejri.

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Statement on the welfare of animals. All procedures in this study were performed following the guidelines for the Proper Conduct of Animal Experiments outlined by the University of Tunis El Manar, Tunis, Tunisia (No. 1474 certificated on August 14th, 1995), as well as all applicable international, national, and/or institutional guidelines for the care and use of animals in Research.

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Mejri, M., Bakkari, W., Tazarki, M. et al. Discriminant Geographic Variation of Saccular Otolith Shape and Size in the Common Pandora, Pagellus erythrinus (Sparidae) across the Gulf of Gabes, Tunisia. J. Ichthyol. 62, 1053–1066 (2022). https://doi.org/10.1134/S0032945222060169

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