Title: The evaluation of the fecundity changes during the breeding season of silver carp’s females, hypophthalmichthys molitrix

Biography:

Fatima-Zahra MAJDOUBI has completed her studies on food processing engineering at the age of 24 years from Agronomic and Veterinary Institute Hassan II. She is actually a PhD student on biology at the faculty of sciences and ‎techniques ‎, University of Sultan Moulay Slimane, Morocco.

Abstract

The present study focuses, on one hand, on evaluating ‎the changes of females’ ‎relative fecundity through the breeding ‎season. On the other ‎hand, it investigates the ‎relationship between the ‎spawning periods and the females’ relative fecundity, weight ‎and age.‎

The induced breeding operations were performed during two ‎consecutive breeding ‎seasons (2016 and 2017). The ‎Broodfish, used in this study, originated from the Deroua ‎‎Fisheries Station, Morocco. ‎fish breeders were reared in earthen ponds ‎‎and feed on ‎phytoplankton ‎‎(Diatomophyceae and ‎Chlorococcales) ‎‎(Farid ‎et al, 2014) available naturally in ‎those ‎ponds. During the two seasons, 44 and 36 females were ‎manipulated respectively. The mean of ova production of these two sets of males, was ‎‎respectively 135.78 g ± 5,64 g (ova /kg of female body weight) and ‎‎142.80 g ± 10.69 g (ova /kg of female body weight‎) ‎

The results revealed that there is no period effect on ‎‎fecundity through the breeding season. However, the ‎‎correlation test showed that the females’ relative fecundity ‎‎correlated positively with the spawning periods. For the two ‎‎successive seasons, the correlation (r²) was 0.18 and only 0.085, ‎‎respectively. Furthermore, Females ‘fecundity was negatively ‎related to their age (-0.283 and -0.108, ‎respectively). ‎

Contrariwise and through the two breeding ‎seasons, the ‎‎females’ weight and oocytes weight were significantly ‎positively correlated. At the first season, the correlation was ‎‎0.668, while at the second season the correlation has recorded ‎‎0.536.