Mineral besi sebagai peningkat vitalitas ikan kerapu bebek (Cromileptes altivelis) saat kondisi stres hipoksia

Abstract

Humpback grouper (Chromileptes altivelis) is sensitive to stress that caused low growth rate, mortality, and harvest. Iron is micronutrient that can enhance the immunity. This experiment was conducted to determine the iron supplement in the feed for humpback grouper fish to vitality increase at hypoxia stress condition. The fish weight 4.14±0.01 g/ind. and was cultured in 60x40x50 cm aquarium and stocked at a density of 10 ind./aquarium. After reared for 61 days, the fish was fed by diet that contained inorganic-iron supplementation at 0, 50, 100, and 200 ppm respectively. The feed was given three times daily at a satiation. The fish was exposed two hours during hypoxic condition and the rearing period were 25 days at normoxia. The results of this study showed that growth performance of fish not significantly different among iron supplement levels, but during and after hypoxia exposure, 50 ppm Fe supplement in the diet of humpback grouper showed the most vitality and healthy condition of fish, while the survival rate of fish was 100% and the growth relative was 82%. However, the humpback grouper fish grew negatively if iron supplement in the diet was more than 50 ppm.