Abstract

ATENCIO G, Víctor; KERGUELEN D, Eduardo; NAAR, Elkin  and  PETRO, Robert. Reproductive performance of bocachico Prochilodus magdalenae induced twice in the same year. Rev.MVZ Cordoba [online]. 2013, vol.18, n.1, pp.3304-3310. ISSN 0122-0268.

Objective. To evaluate the reproductive performance of hormonally induced bocachico with carp pituitary extract (CPE) twice in the same year. Materials and methods. 23 females, in their final maturation phase, were induced with 5 mg EPC/Kg of body weight in two applications, initially 10% and 90% twelve hours later. Males was applied 80% of the total female dose. Results. After the first hormonal induction, females were fit again at 97.6±12.4 days. Ovulation rate in both hormonal inductions was 0.91 (21/23). Absolute fecundity (g-oocytes/female) showed no significant differences between the first and second induction (36.2 and 44.6 g oocytes/female, respectively) (p>0.05), but when expressed in number of oocytes per female there was a significant difference (p<0.05), the fertility rate being higher in the first induction (53535 oocytes/female) compared with the second induction (40658 oocytes/female). Relative fecundity, expressed in both g-oocytes/Kg-female and oocytes/Kg-female showed a significant difference, being higher in the first induction (p<0.05). Fertilization rate (73.9±19.6%) and hatching (56.9±17.9%) were higher in the first induction, compared to the second one(55.6±21.1% and 35.6±20.7%, respectively) (p<0.05). Conclusions. After hormonal induction a period of approximately three months is required for a female bocachico to reach final maturation and be suitable for a new hormonal induction. The ovulation rate was not affected by a second induction in the same year, but the absolute and relative fertility can be reduced between 24 and 66% and fertilization and hatching rates between 23 and 36%.

Keywords : Biopsy; fecundity; fishes; oocyte maturation; oogenesis; reproduction.

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