Effect of ethanol extract of pistachio hull (Pistachia vera) on growth factors, survival and body composition of rainbow trout (Oncorhynchus mykiss)

This study was carried out to investigate the effect of pistachio green hull extract (PGHE) on growth¡ survival and body composition of rainbow trout. The experiment was performed in a completely randomized design with five treatments and three replications (14 fish in each replicates). Fish with 18.06±0.93 g initial weight¡ were fed with the diets (3% of biomass per day) for 8 weeks. The diets contained 0¡ 0.5¡ 1.5¡ 4.5 and 9 g PGHE/Kg were made. The total phenolic content of PGHE were 21.52 mg gallic acid/ gr dry matter. Results did not show any significant differences (P>0.05) in SGR (Specific Growth Rate)¡ FCR (Feed Conversion Ratio)¡ survival¡ hepatosomatic index and body composition (moisture¡ protein¡ lipid¡ ash) among the different treatments. The maximum condition factor (1.24±0.02) was observed in fish treated with 1.5 g PGHE/Kg in the diet¡ being significantly different from control group (p