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Age and Growth of the Grass goby Zosterisessor ophiocephalus Pallas, 1811 in the Gulf of Gabes (Tunisia, Central Mediterranean)

Ferid HAJJI ; Institut National des Sciences et Technologies de la Mer (Centre de Sfax), BP 1035, 3018 Sfax, Tunisie
Amira OUANNES-GHORBEL ; Institut National des Sciences et Technologies de la Mer (Centre de Sfax), BP 1035, 3018 Sfax, Tunisie
Mohamed GHORBEL ; Institut National des Sciences et Technologies de la Mer (Centre de Sfax), BP 1035, 3018 Sfax, Tunisie
Othman JARBOUI ; Institut National des Sciences et Technologies de la Mer (Centre de Sfax), BP 1035, 3018 Sfax, Tunisie

Sažetak

Zosterisessor ophiocephalus is currently an important component of the eastern Mediterranean inshore fisheries. In Tunisia it was recorded for the first time in the Gulf of Gabes in 1993, where it is now an important fished species. In this study age and growth parameters were determined in the Gulf of Gabes (southeast of Tunisia) based on otolith analysis of 824 specimens caught between September 2006 and August 2007. Monthly changes in marginal increments, determined from alternation of macroscopic opaque and translucent bands, of Zosterisessor ophiocephalus sagittae were examined. These results allowed us the estimation of the approximate age to the appearance of each annulus. The observed age was 6 years old for both sexes. Von Bertalanffy parameters based on length at age data were TL∞ = 24.83 ± 1.69 cm, K = 0.19 ± 0.03 year-1 and t0 = - 0.91 ± 0.12 for males and TL∞ = 24.13 ± 1.17 cm, K = 0.20 ± 0.02 year-1 and t0 = - 0.80 ± 0.09 for females. The length-weight relationship for both sexes of Zosterisessor ophiocephalus is Wt = 0.021 TL 2.789. The size at which 50% of females and males matured was respectively 12.65 cm and 13.91 cm total length (TL). The age at which 50% of females and males matured was respectively 2.9 and 3.5 years.

Ključne riječi

age; growth; Zosterisessor ophiocephalus; Gulf of Gabes; Tunisia; Mediterranean Sea

Hrčak ID:

115707

URI

https://hrcak.srce.hr/115707

Datum izdavanja:

3.6.2013.

Podaci na drugim jezicima: hrvatski

Posjeta: 1.239 *