The trial was conducted with catfish fingerlings (6.1±0.2 g grams initially). Fifteen fish were stocked in 3 replicate 240-L tanks per diet in a recirculating system . Fish were fed twice daily to satiation for 10 weeks. Weight gain, FCR, Hepatosomatic index, and survival did not differ among diets. The total iron concentration in the blood and intestine were also similar among diets (Table 1) . Total liver iron concentration was significantly higher in fish fed diets supplemented with 250 mg Fe/kg in both iron forms than in those fed diets with less iron. Histological analysis of the liver showed that diets supplemented with 250 mg Fe/kg in both iron forms caused significant liver damage compared to the other diet groups. No obvious signs of anemia were observed in fish fed the basal diet. Results indicate that high-iron diets can produce liver damage in catfish fingerlings without reducing growth performance. Other results will be presented at the meeting.