Data/hora: 07/06/2024 04:58:21

Provedor de dados: | 5
País: | France
Título: | Biologie et pêche traditionnelle des crevettes pénéides dans l'embouchure d'un fleuve en milieur semi-aride (sud-ouest de Madagascar)
Autores: | Laroche, Jean; Benoely,; Siaviri, A.
Data: | 1995
Ano: | 1995
Palavras-chave: | Pêche; Estuaire; Dynamique population; Croissance; Taille corporelle; Cycle évolutif; Zone semi aride; Madagascar; Penaeus japonicus; Penaeus monodon; Penaeus indicus; Metapenaeus monoceros; Rivière Onilahy; Afrique; Milieu saumâtre; Macrura; Decapoda; Crustacea; Arthropoda; Invertebrata; Fishing; Estuaries; Population dynamics; Growth; Body size; Life history; Semi arid zone; Malagasy Republic; Penaeus japonicus; Penaeus monodon; Penaeus indicus; Africa; Brackish water environment; Macrura; Decapoda; Crustacea; Arthropoda; Invertebrata.
Resumo: | Traditional fishing using beach seines was studied over a period of one year at the mouth of the Onilahy river. The catches/efforts were recorded on a daily basis, biological sampling and the measurement of hydrological parameters being carried out twice a month. The moderate variations of salinity and temperature (14 &lt; salinity &lt; 35; 25 degrees C &lt; temperature &lt; 30 degrees C) which were observed in the estuary can be explained by the semiarid climate of the area. Four species of penaeid shrimps are to be found on the Onilahy: Metapenaeus monoceros, Panaeus indicus, Penaeus monodon and Penaeus japonicus, which were mainly caught at the subadult/adult stage with a Carapace length between 10 and 50 mm. The presence of these important sizes at the mouth of the river, associated with the fact that no mature female shrimps were observed in the catches, means that part of the population tends to extend its stay in the estuary. Growth parameters were estimated for M. monoceros and P. indicus, and the growth in the estuary appears to be faster than that observed at sea, especially for P. indicus. In contrast with what is observed in wet tropical areas, the decline in salinity is limited in semiarid climates and is thus not a major factor in the emigration of the shrimps towards the open sea. On the other hand, there is a rather precise link between emigration towards the open sea and falling temperature: important sizes disappear from the river mouth during the transition between autumn and winter. In the estuary of the Onilahy, a temporal partitioning of resources for the four species of penaeid, leading to a reduction of interspecific competition, can be underscored. The traditional fishing yield in the estuary was estimated at 220 metric tons of shrimps per annum, with a catch per unit effort of 15 to 22 kg/seine/trip.
Tipo: | Text
Idioma: | Francês

Identificador:

http://archimer.ifremer.fr/doc/00097/20828/42822.pdf

http://archimer.ifremer.fr/doc/00097/20828/

Editor: | Gauthier-Villars
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-Villars), 1995 , Vol. 18 , N. 6 , P. 659-670

Fonte:

Elsevier

info:eu-repo/semantics/openAccess

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