Resumo

MARANON HERRERA, Samuel; TIJERA DEMESA, Víctor; SALGADO ZAMORA, Héctor  e  MAYA PENA, Eduardo. Anabolic effect induced by trenbolone acetate steroid on the Carassius auratus (Pisces: Cyprinidae) growth. Hidrobiológica [online]. 2008, vol.18, n.1, pp.41-50. ISSN 0188-8897.

The anabolic efficiency of steroid trenbolone acetate was evaluated in 60 days old juveniles of Carassius auratus. Fish were exposed during 120 days to steroid at a dose of 300 mg/kg food. Total length, standard length, height and weight were registered every two weeks. The benefit of the steroid was characterized with a model that relates the weight as a function of time, coupled to other two models: one where size is related with time and an alometric one which correlates weight with size. The models showed that growth of steroid treated fish was superior to that of untreated (control) fish, differing significantly (p <0.001), while the alometric model for each treatment, indicated a similar growth (p>0.05). Analysis of the variability of the three models demonstrated that the estimates adequately described the growth. This was further confirmed by the determination coefficient (r²) that fluctuated between 72.9 and 93.5% and by the distribution analysis of size and weight by means of box plots. It was concluded that application of the steroid trenbolone acetate to Carassius auratus was successful. A survival rate of 100% was registered coupled to an efficient anabolic effect, since a 48.0% gain of biomass and 41.3% increase in size were obtained as compared to the control group.

Palavras-chave : Anabolic; trenbolone acetate; Carassius auratus; growth model and alometric.