Morphological variability of saccular otoliths in two populations of Liza ramada (Risso, 1810) (Mugilidae) in Tunisian lagoons (Bizerte and Ghar El Melh)

作者：Rebaya Manel^*; Ben Faleh Abderraouf; Allaya Hassen; Khedher Maissa; Marsaoui Bochra; Chalh Abdellah; Quignard Jean Pierre; Trabelsi Monia

来源：Cahiers de Biologie Marine, 2016, 57(3): 227-234.

• Liza ramada
• Otolithometry
• Stock discrimination
• Symmetry
• Asymmetry
• Bizerte Lagoon
• Ghar El Melh Lagoon
• Tunisia

Otolith shape of sagittae is a valuable tool to evaluate the stock structure of fish species. The aim of this study was to investigate the stock discrimination for 120 specimens of the thin-lipped grey mullet Liza ramada (Risso, 1810) sampled from two Tunisian lagoons' stations (Bizerte and Ghar El Melh) for the first time. We analysed sagitta otolith shape variation of this species for both sexes and two sides (left-right otolith) for each specimen. Statistical and Discriminant Function Analysis for Sagitta shape clearly demonstrated statistically significant differences between the two different populations. These results were also confirmed by highly statistically significant differences between otoliths' shape (left and right) for both sexes. In addition, an asymmetry was detected when comparing otoliths of the same side (RR-LL) between different sampling sites. The shape variability of otolith between these two sampling sites is probably correlated with local environmental and ecological factors.

• 出版日期2016