Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)

Biological features known as sex-ratio, Gonad-Somatic Index (GSI), Hepatic-Somatic Index (HSI) and size at first sexual maturity, and the length-weight relationships (LWR) were studied in little tunny, Euthynnus alletteratus, caught in the Gulf of Gabes (Southern Tunisia). A total of 397 little tunn...

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Autores principales:	Hajjej,Ghailen, Hattour,Abdallah, Allaya,Hassen, Jarboui,Othman, Bouain,Abderrahmen
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2010
Materias:	Gonad-Somatic Index size at first sexual maturity length-weight relationship
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000300004
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spelling	oai:scielo:S0718-195720100003000042011-02-03Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)Hajjej,GhailenHattour,AbdallahAllaya,HassenJarboui,OthmanBouain,Abderrahmen Gonad-Somatic Index size at first sexual maturity length-weight relationship Biological features known as sex-ratio, Gonad-Somatic Index (GSI), Hepatic-Somatic Index (HSI) and size at first sexual maturity, and the length-weight relationships (LWR) were studied in little tunny, Euthynnus alletteratus, caught in the Gulf of Gabes (Southern Tunisia). A total of 397 little tunny (244 females and 153 males) were analysed. Fish length ranged between 36.7 and 97.8 cm, average 52.29 ± 5.87 cm. Samples were monthly fished from January 2008 to December 2009. Sixty one percent of the specimens caught were females. The high GSI suggest that the spawning period runs from June to September. Fish in spawning condition are to be observed in August since GSI reaches the peak in July. Negative allometry was found in little tunny. Fork length at first sexual maturity in males (42.8 cm) was smaller than in females (44.8 cm).info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.45 n.3 20102010-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000300004en10.4067/S0718-19572010000300004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Gonad-Somatic Index size at first sexual maturity length-weight relationship
spellingShingle	Gonad-Somatic Index size at first sexual maturity length-weight relationship Hajjej,Ghailen Hattour,Abdallah Allaya,Hassen Jarboui,Othman Bouain,Abderrahmen Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)
description	Biological features known as sex-ratio, Gonad-Somatic Index (GSI), Hepatic-Somatic Index (HSI) and size at first sexual maturity, and the length-weight relationships (LWR) were studied in little tunny, Euthynnus alletteratus, caught in the Gulf of Gabes (Southern Tunisia). A total of 397 little tunny (244 females and 153 males) were analysed. Fish length ranged between 36.7 and 97.8 cm, average 52.29 ± 5.87 cm. Samples were monthly fished from January 2008 to December 2009. Sixty one percent of the specimens caught were females. The high GSI suggest that the spawning period runs from June to September. Fish in spawning condition are to be observed in August since GSI reaches the peak in July. Negative allometry was found in little tunny. Fork length at first sexual maturity in males (42.8 cm) was smaller than in females (44.8 cm).
author	Hajjej,Ghailen Hattour,Abdallah Allaya,Hassen Jarboui,Othman Bouain,Abderrahmen
author_facet	Hajjej,Ghailen Hattour,Abdallah Allaya,Hassen Jarboui,Othman Bouain,Abderrahmen
author_sort	Hajjej,Ghailen
title	Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)
title_short	Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)
title_full	Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)
title_fullStr	Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)
title_full_unstemmed	Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)
title_sort	biology of little tunny euthynnus alletteratus in the gulf of gabes, southern tunisia (central mediterranean sea)
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000300004
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Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)

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