Data/hora: 05/06/2024 17:03:36

Provedor de dados: | 20
País: | Belgium

Título:

Analyse démographique des captures de thon rouge et de la thonine des madragues Tunisiennes

Demographic analisis of bluefin tuna and little tuna captured by Tunisian traps

التحليل الديمغرافي  لأسماك التنّ الأحمر والتنّ الصغير بالمضارب التونسيّة

Autores: | Hattour, A.
Data: | 2012-05-27
Ano: | 2004
Palavras-chave: | Euthynnus alletteratus  Thunnus thynnus; Population structure; Trap nets; Stock identification; Tuna fisheries; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Resumo: | The temporal evolution of the demographic structure of bluefin tuna (Thunnus thynnus, Linnaeus 1758) and of the little tuna (Euthynnus alletteratus, Rafinesque 1810) by the Tunisian traps of Sidi Daoud and Monastir is studied during 3 periods (1979-1983; 1988-1992 and 1993-1997). This survey showed the two points of passive capture landing draw the bluefin tuna from two populations of different composition. The fish taken from Tunisian waters do not from a homogenous group of similar beings, since they result from a mixture of local Mediterrean and Atlantic forms. This conclusion was arrived at by Heldt (1929), and confirmed in 2004, by displacement studies indicated that, after reproduction, the adults (&lt;100kg) remained in the Mediterranean, and that, after spawning, the giant bluefin tuna migrate into the northeast Atlantic. For the little tuna, the two traps harvest one same Mediterranean stock, even though the genetic studies on the little tuna according to the sequential data on mitochondrial DNA revealed an important degree of differentiation of certains populations suggesting that movements of these fishes are compelled to the limited areas
Tipo: | Journal Contribution
Idioma: | Francês

Identificador:

Bulletin de l'Institut National des Sciences et Technologie de la Mer (INSTM), 31 , p. 25 -34

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http://hdl.handle.net/1834/4235

Editor: | INSTM