INIDEP Informe Técnico, 51: 1-10.

INIDEP Informe Técnico, 51: 1-10.

Ehrlich, M.D.; Macchi, G.J. 2003. Fecundidad e índice de prerreclutas de merluza en el sector costero norpatagónico. INIDEP Informe Técnico, 51: 1-10.
Ver texto completo

Fecundity and prerecruit indices of hake in the northpatagonian coastal area. Hake fecundity was estimated with the gravimetric method using ovaries with hydrated oocytes without post-ovulatory follicles. Samples were obtained in three research cruises off Chubut, SW of Península Valdés between 42° S and 45° S, near Isla Escondida, during December 1993, 1994 and 1996, time which coincides with the most important reproductive activity. Relative fecundity values were 722 ± 107, 606 ± 60 and 533 ± 26 oocytes per gram of female without ovaries, respectively. Partial fecundity was adjusted to a potential model for total length and weight without ovaries, corresponding: F = 0.9988 * Lt 3.294 and F = 197.91 * P 1.1585 for 1994 and F = 6.9785 * Lt 2.816 and F = 552.22 * P 0.9889 for 1996. There were no significant differences (P>0.10) between 1994 and 1996 batch fecundity values. Indices of prerecruits CPUE (late larvae and early juveniles between 10-110 mm) were obtained during April 1997 and 1998 in five strata in the northpatagonian coastal area, between 43° 30’ S and 47° S. The highest values corresponded to Isla Escondida and Fondeadero Mazarredo. Comparison of CPUEs indices of each stratum showed that 1998 values were lower than those of 1997, which indicates there was no sign of stock recovery.