Fréon Pierre, El Khattabi M., Mendoza J., Guzman R. (1997). Unexpected reproductive strategy of Sardinella aurita off the coast of Venezuela. Marine Biology, 128, p. 363-372. ISSN 0025-3162.
Titre du document
Unexpected reproductive strategy of Sardinella aurita off the coast of Venezuela
Année de publication
1997
Type de document
Article
Auteurs
Fréon Pierre, El Khattabi M., Mendoza J., Guzman R.
Source
Marine Biology, 1997,
128, p. 363-372 ISSN 0025-3162
Biological sampling of Spanish sardine (Sardinella aurita Valenciennes, 1847) off the coast of Venezuela from 1956 to 1989 was used to study the reproductive strategy and migration pattern of the population. Whereas in many pelagic fishes the energy re-allocation necessary for reproduction usually occurs optimally at the end of the upwelling season when planktonic production reaches a maximum, in the present study a 5 mo delay was observed. This suggests that energy was stored as lipids early in the season and released later via metabolism for gamete production. Major reproduction did not occur in an area and at a time when offshore transport and turbulence were low, which is also unusual for a pelagic fish species. These results are discussed in terms of the life cycle of the Spanish sardine and its possible migratory patterns. The reproductive strategy of this population apparently gives priority to optimising food availability for the offspring and not to preventing eggs and larvae being transported offshore. The presence of "retention" areas could explain this unexpected strategy. (Résumé d'auteur)
Plan de classement
Dynamique de populations / modélisation [036MILMAR01]
Descripteurs
SARDINELLE ; DYNAMIQUE DE POPULATION ; REPRODUCTION SEXUEE ; MIGRATION ; UPWELLING ; VARIATION SPATIALE ; VARIATION TEMPORELLE
