Effects Of The Steroid, Methandrostenolone, On Growth And Gross Pathology Of Channel Catfish

Methandrostenolone was not effective in promoting growth in channel catfish (Ictalurus punctatus) at the 2.5 mg/kg of body weight/day dosage level. There were no significant differences (.05 level) in treated and untreated fish with respect to total weight gain, percent crude protein, and moisture content of the Hesh. No differences were observed in gross morphology, liver to body weight ratios, or microscopic examination of liver sections. However, after approximately 3 to 4 wks in a distilled water bath, the hemotoxylin/eosin stain had cleared only from liver sections of the catfish receiving the steroid.