اثرات گرسنگي و تغذيه مجدد بر عملكرد رشد و فاكتورهاي بيوشيميايي خون در ماهي آزاد درياي خزر(Salmo trutta caspius)

Effects of starvation and refeeding on blood biochemical factores and growth performance in caspian salmon (Salmo trutta caspius)

An investigation was performed to determine effects of feeding stretegy emplowing alternate periods of fasting and satiayion feeding on some blood biochemical composition and growth performance. 900 parr Caspian salmon (salmo trutta caspius) (average weight 12.5±1g) were stocked into 18 quadratic concrete (50 fish per tank) in an open system. The fish were fed a commercial, pletted modifies rainbow trout diet at 4 feeding frequencies-full-fed (FFF), 3 weeks fed and 3 weeks following starved (FS), 3 weeks starved and 3 weeks fed (SF), 2 W starved, 2 W fed and 2 W starved (SFS), 2 W fed, 2 W starved and 2 W fed (FSF), or full-starved (SSS). Full-fed fish were fed to satiation daily for 42 days. Fish were weighed every 2 weeks interval. At the end of terial blood sample were drawn. Starvation resulted in glucose, triacylglycerol and cholesterol levels reduction and did not reache to full-fed group even after 3 weeks refeeding. There were significant differences among groups in Caspian salmon body weight increase, final weight, feed conversion ratio, specific groth rate and condition factor. Hepatosomatic index decreased changes were not significant. In addition, there was no mortality in all groups specially in fish starved 6 weeks.