Manejo de la primera alimentación del bocachico (Prochilodus magdalenae)

In the Centro de Investigacion Piscicola de la Universidad de Cordoba were two experiments. In the first experiment was conducted to investigate the effects of different preys to first feeding on bocachico (Prochilodus magdalenae) larviculture. The onset feeding bocachico post-larvae stocked into aquarium at density 50/L, were fed at 5 Prey/mL during five days: Artemia nauplii (NA), descapsulated Artemia cysts (CA), wild zooplankton of 125 to 160 mm (Z125-160) and zooplankton of 250 to 400 mm (Z250-400). In addition, a group post-larvae was subjected to starvation. Bocachico post-larvae fed NA (2.0±1.8 mg, 1.8±0.9 mm) and Z250-400 (2.0±1.1 mg, 1.6±0.5 mm) were that offered better results for weight and total length gain (p 0.05). The post-larvae fed during 7 days presented higher weight gain (5.3±3.8 mg) and length gain (2.8±1.6 mm) than other experimental groups (P 0.05). The specific growth rates were not significantly different between experimental groups (P>0.05). Survival rates of post-larvae fed during 3, 5 and 7 days were higher when them were subjected to stress resistance test. In contrast, the survival of postlarvae fed by one day was significantly lower (87±1%) to stress resistance test (P<0.05). The results of the study suggest that the nauplii of Artemia or the wild zooplankton range 250 and 400 μm, free predators copepods, it is adecuated prey items for the handling of the first feeding of the bocachico at least during 3 days before to be stocked in fertilised nursery ponds.