Stocking Densities and Chronic Zero Culture Water Exchange Stress Effects on Biological Performances, Hematological and Serum Biochemical Indices of GIFT Tilapia Juveniles (Oreochromis niloticus)

摘要: Stocking densities and long term zero culture water exchange rate effects, on biological performances, hematological serum indices of Genetically Improved Farm Tilapia (GIFT) strain cultured in tanks were investigated. The trial was divided into four groups with three replicates each, conducted under natural photoperiods for 30 days; data analysed using one way ANOVA. Results showed that, high stocking negatively affected the biochemical GIFT tilapia juveniles. Feeding efficiency, specifc growth survival rates significantly decreased. Hematoogical indices: red blood cells, white Hemoglobin, Hematocrit platelet decreased as density increased. Indices liver function (Aspartate aminotransferase (AST) Alanine (ALT) activities) significant Serum glucose levels, an indicator cortisol released increased Meanwhile, total protein, triglyceride, cholesterol, triiodothyroxine, thyroxine levels downward regulation same experimental conditions. This paper would provide useful scientific knowledge performances physiological responses to stressors like exchange. Research different fish sizes should be further conducted.