Kone V., Lett Christophe, Penven Pierrick, Bourlès Bernard, Djakoure S. (2017). A biophysical model of Sardinella aurita early life history in the northern Gulf of Guinea [résumé]. In :
Brehmer Patrice (ed.), Ba B. (ed.), Kraus G. (ed.). International conference ICAWA 2016 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters. Dakar : SRFC/CSRP ; IRD, p. 90-91. ICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15. ISBN 978-2-9553602-0-5.
Titre du document
A biophysical model of Sardinella aurita early life history in the northern Gulf of Guinea [résumé]
Année de publication
2017
Type de document
Colloque
Auteurs
Kone V., Lett Christophe, Penven Pierrick, Bourlès Bernard, Djakoure S.
In
Brehmer Patrice (ed.), Ba B. (ed.), Kraus G. (ed.), International conference ICAWA 2016 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters
Source
Dakar : SRFC/CSRP ; IRD, 2017,
p. 90-91 ISBN 978-2-9553602-0-5
Colloque
ICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15
Sardinella aurita is the most abundant small pelagic fish in the northern Gulf of Guinea. Its reproduction and recruitment depend crucially on environmental conditions. We developed a biophysical model of S. aurita early life history by coupling offline an individual-based model with the regional oceanic modeling system (ROMS). We used this model to investigate the main factors driving variability in eggs and larval dispersal and survival in the northern Gulf of Guinea. Precisely, individuals were released from different spawning areas along the coast and tracked for a period of 28 days corresponding to their planktonic phase. Individuals that remained in the coastal recruitment areas at an age more than 7 days, at which they can supposedly actively retain themselves in a favorable area, were considered as recruited. Simulation results show the importance of the spawning areas around Cape Palmas and Cape Three Point where cyclonic eddies trap eggs and larvae along the coast, preventing their advection offshore by the Guinea current. The spawning period also plays a key role in the recruitment success, with highest coastal retention obtained during the major upwelling period (July to September). We find that, a second retention peak can occur during the minor upwelling period (February to March) when larval mortality due to temperature is included in the model. These results are in general agreement with knowledge of S. aurita reproduction in the northern Gulf of Guinea. The spawning depth also influences the recruitment success of S. aurita in the northern Gulf of Guinea. The retention increasing with the spawning depth.
Plan de classement
Sciences du milieu [021]
;
Limnologie physique / Océanographie physique [032]
;
Ressources halieutiques [040]
Localisation
Fonds IRD [F A010071832]
Identifiant IRD
fdi:010072133
