Efecto anabólico y androgénico del esteroide acetato de trembolona en el guppy (Poecilia reticulata)

the effect of semi-synthetic steroid trenbolone acetate (tba) on the ornamental fish poecilia reticulata (guppy) was studied. the steroid at a dose of 300 mg/kg feed was administered to 30 days old juvenile specimens during 60 days. forty days after treatment was ended, an evaluation aimed to determine the steroid residual effect was undertaken. survival, masculinization ratio and the drug anabolic effect were analyzed. results showed tba to be effective to induce masculinization, differing (p < 0.001) with the control group, which registered 32% males and 68% females. tba turned out to be an excellent anabolic as well, since treated fish showed weight increase, a larger body and an increased size of caudal fin. the steroid did not cause any damage on the treated population. the survival factor was 93.3% for the treated fish as compared to 83% for the control group.