Summary:The growth and mortality of the brown meagre, Sciaena umbra from the Gulf of Tunis, were investigated using a sample of 276 specimens, ranging from 15.3 to 49.2 cm total length and from 43 to 1565 g total weight. Specimens were collected from artisanal fisheries between October 2008 and September 2011. Otoliths were extracted, thin cross-sections were realized and radii were measured. The log-linear morphometric relationships between total length-total weight and total length-otolith radius were significant (p<0.05), showed positive allometry (b=3.15) and isometry (b=0.90), respectively. The marginal analysis suggested that only one growth increment was deposited per year. The maximum age of the brown meagre was 22 years for males and 31 years for females. The fit of the von Bertalanffy growth function was significantly different between sexes (p<0.05): TL ∞ =43.8 cm, k=0.145 y -1 , t 0 =-4.88 y for males and TL ∞ =50.1 cm, k=0.105 y -1 , t 0 =-5.71 y for females. The instantaneous total (Z) and natural (M) mortalities were estimated for each sex, resulting in an exploitation ratio (E=F/Z) of 0.43 for males and 0.46 for females.Keywords: brown meagre; thin otoliths; growth; mortality; Gulf of Tunis; Mediterranean Sea. Edad, crecimiento y mortalidad de Sciaena umbra (Sciaenidae) en el Golfo de TúnezResumen: Se investigó el crecimiento y la mortalidad de Sciaena umbra del golfo de Túnez, utilizando una muestra de doscientos setenta y seis especímenes que miden de 15.3 cm a 49.2 cm de longitud total y pesan de 43 g a 1565 g. Las muestras se recogieron de pesquerías artesanales entre octubre de 2008 y septiembre de 2011. Se extrajeron los otolitos, se realizaron secciones transversales delgadas y se midieron los radios. Las relaciones morfométricas logarítmicas entre la longitud total y el peso total de una parte y la longitud total y el radio de otolito de otra parte resultaron significativas (p<0.05) y mostraron respectivamente alometría positiva (b=3.15) e isometría (b=0.90). El análisis marginal sugirió que se depositaba un solo anillo de crecimiento por año. La edad máxima de la corvina negra es de 22 años para los machos y de 31 años para las hembras. El ajuste de la función de crecimiento de von Bertalanffy resultó significativamente diferente entre los sexos (p<0.05): TL ∞ =43.8 cm, k=0.145 y -1 , t 0 =-4.88 y para los machos y TL ∞ =50.1 cm, k=0.105 y -1 , t 0 =-5.71 y para las hembras. La mortalidad instantánea total (Z) y natural (M) se estimó para cada sexo, dando como resultado una tasa de explotación (E=F/Z) de 0.43 para los machos y de 0.46 para las hembras.Palabras clave: corvina negra; otolitos finos; crecimiento; mortalidad; golfo de Túnez; mar Mediterráneo. Citation/Como citar este artículo: Chater I., Romdhani-Dhahri A., Dufour J.-L., Mahé K., Chakroun-Marzouk N. 2018. Age, growth and mortality of Sciaena umbra (Sciaenidae) in the Gulf of Tunis. Sci. Mar. 82(1): 000-000. doi: https://doi.
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