INIDEP Inf. Téc. 16: 13-25, 1997

INIDEP Inf. Téc. 16: 13-25, 1997

Aspectos de la biologia reproductiva de la castaneta (Cheilodactylus bergi) en la zona comun de pesca Argentino-Uruguaya.

Autor: Otto C. Wöhler.
Contribución INIDEP 901


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Citar como:
Wöhler, O.C. 1997. Aspectos de la biologia reproductiva de la castaneta (Cheilodactylus bergi) en la zona comun de pesca Argentino-Uruguaya. INIDEP Informe Técnico 16, 13-25. Disponible en: http://hdl.handle.net/1834/5795.

Summary

Aspects of the reproductive biology of castaneta (Cheilodactylus bergi) in the Argentine-Uruguayan Common Fishing Zone. Length and age at first maturity was estimated, and the distribution of the spawning stock of castaneta (Cheilodactylus bergi) was analyzed, with the aim of understanding the spawning activity and its relation with oceanographic parameters. Samples came from two research cruises carried out in the Argentine-Uruguayan Common Fishing Zone (CFZ) (SW Atlantic, between 34 degree and 39 degree 30’S), during the end of spawning period (May-June) of 1991 and 1993. Length at first maturity was estimated in 21.34 cm and 23.69 cm of total length, for males and females respectively. Age at first maturity estimated for sexes combinated corresponding to 2.60 years. A spawning area in the north (between 35 degree and 37 degree S) was determined, showing a high incidence of individuals in spawning stage. This area is related with a shelf break front. Spawning individuals were principally located in deeper waters (between 70 and 140m) and lower temperatures (9-13 degree C), from those post-spawning and immature individuals. These ones were situated in depths from 50 to 70m and temperatures from 13 and 16.5 degree C. Post-spawning individuals and juveniles were founds in the southern region of the study area.