Effect of stocking density of juvenile Arapaima gigas on rearing water quality hematological and biochemical profile, and productive performance

At inadequate stocking density, fish generally show different physiological responses. The effects of density on Arapaima gigas larvae productive parameters have been determined in a previous study. This study aimed to evaluate the effect water quality, hematological and biochemical profile, performance juvenile A. gigas. One hundred eighty twelve months old, were distributed into tanks using initial densities 103.90, 157.95 220.11 kg m-3 with three replicates. Ammoniacal nitrogen, carbon dioxide, dissolved oxygen pH, alkalinity, hardness LaMotte Fish Farm 9, AQ-2 model, Maryland, USA, freshwater test kit. Blood samples taken at 13, 14, 15 old by pricking caudal vein profiles glucose (Glu), total protein (TP), albumin, aspartate transaminase (AST), alanine (ALT), urea, blood serum. Rearing was saturated ammoniac but not changed increase (P < 0.05), Erythrocyte's count (EC) diminished nonetheless, hemoglobin, mean concentration hemoglobin (MCH) cell volume (MCV) increased 0.05). Albumin, AST, ALT urea feed intake increased, final biomass gain 100.26 ± 19.00, 119.10 13.95, 130.24 08.07 m-3, did change as Juveniles showed no variation an density. Furthermore, adapting profile high characterized this species.