Effect of High Salt Concentrations on some Growth Characteristics and Feed Intake Rate of Ctenopharyngodon idella

Abstract Grass carp at a weight of 34.68 + 2 g were gradually exposed to four saline concentrations: tap water (0.1), 3, 6, 9, and 12 gm/litter, the first concentration represented control treatment. Fish fed on diet with protein content 30% for ten weeks. Results growth experiment showed that feed conversion rate was 2.46, 3.58, 4.84, 6.77, -8.56 in fifth treatments, respectively, efficiency 40.65, 27. 93, 20.66, 14.77 11.68 %, while intake 22.38, 20.44, 18.86, 17.47 16.56 salt concentrations 0.1, 9 g/L, respectively. In another study effect acclimatization intake, grass an average 25.66 gm previous same ratio experiment. Feed as percentage body amounted 4.62, 4.12, 3.78, 3.24, 2.48% It concluded from current characteristics negatively affected by high concentrations.