Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Tessier A., Blin C., Cottet M., Kue K., Panfili Jacques, Chanudet V., Descloux S., Guillard J. (2019). Life history traits of the exploited Nile Tilapia (Oreochromis niloticus - Cichlidae) in a subtropical reservoir (Lao PDR). Cybium, 43 (1), 71-82. ISSN 0399-0974

Lien direct chez l'éditeur doi:10.26028/cybium/2019-431-007

Titre
Life history traits of the exploited Nile Tilapia (Oreochromis niloticus - Cichlidae) in a subtropical reservoir (Lao PDR)
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000462099400008
AuteursTessier A., Blin C., Cottet M., Kue K., Panfili Jacques, Chanudet V., Descloux S., Guillard J.
SourceCybium, 2019, 43 (1), p. 71-82. ISSN 0399-0974
RésuméBiological traits of Oreochromis niloticus were studied in order to identify potential differences between the population of the Nam Theun 2 Reservoir and other populations in Asia and in Africa. The study also aimed to characterize the demographic structure of the exploited population by fisheries in the reservoir. Toluidine-stained transverse section of otoliths from 322 specimens, collected between November 2015 and January 2017, were analysed to identify the periodicity of annulus formation and to age individuals. Length, weight, sex and sexual maturity stage were recorded. Life history traits were characterized by length-weight and length age relationships. The periodicity of annulus formation was annual, with complete formation of the translucent zone at the beginning of the warm and wet season (June and July). The length-age key has been established and was composed of 9 age classes, ranging from 0 to 8 years old. Males showed positive allometric growth whereas juveniles and females exhibited isometric growth. The study showed an asymptotic standard length of 658 mm and a low growth rate (K = 0.08 year(-1)). The sex ratio was equilibrated, and first maturity of females was at 277 mm standard length. The population was composed of individuals aged 3 years old and older, and 60% of the landings were composed of individuals aged 5 years and older. The growth rate was lower than for Asian and African populations, and the age-length key provided was specific to the studied reservoir. However, some biological traits of the O. niloticus population were similar to those found for other population in the world: (i) formation of an annual annulus during the reproduction period, at the beginning of the warm and wet season like populations from subtropical countries, and (ii) an isometric or a positive allometric growth as seen in populations that were not overexploited and were living in favourable environmental conditions. Therefore, the present study suggests that the O. niloticus population of the NT2 Reservoir was not overexploited at the time of the survey.
Plan de classementRessources halieutiques [040]
Descr. géo.LAOS ; ASIE DU SUD EST
LocalisationFonds IRD
Identifiant IRDPAR00019135
Lien permanenthttp://www.documentation.ird.fr/hor/PAR00019135

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito