Age, growth and mortality of <em>Sciaena umbra</em> (Sciaenidae) in the Gulf of Tunis

Inès Chater; Ahlem Romdhani-Dhahri; Jean Louis Dufour; Kélig Mahé; Nadia Chakroun-Marzouk

doi:10.3989/scimar.04679.21A

Autores/as

Inès Chater Université de Tunis El Manar, Faculté des Sciences de Tunis, UR11US12 Biologie de la Reproduction et du Développement Animal https://orcid.org/0000-0002-1059-5015
Ahlem Romdhani-Dhahri Université de Tunis El Manar, Faculté des Sciences de Tunis, UR11US12 Biologie de la Reproduction et du Développement Animal https://orcid.org/0000-0002-1715-7704
Jean Louis Dufour Institut Français de la Recherche pour l’Exploitation de la Mer (IFREMER) https://orcid.org/0000-0002-9588-5432
Kélig Mahé Institut Français de la Recherche pour l’Exploitation de la Mer (IFREMER) https://orcid.org/0000-0002-6506-211X
Nadia Chakroun-Marzouk Université de Tunis El Manar, Faculté des Sciences de Tunis, UR11US12 Biologie de la Reproduction et du Développement Animal https://orcid.org/0000-0002-9417-8795

DOI:

https://doi.org/10.3989/scimar.04679.21A

Palabras clave:

corvina negra, otolitos finos, crecimiento, mortalidad, golfo de Túnez, mar Mediterráneo

Resumen

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, t₀=-4.88 y para los machos y TL_∞=50.1 cm, k=0.105 y^–1, t₀=–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.

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