Saeid Meshkini; Ali Akbar Tafi
Volume 6, Issue 4 , June 2018, , Pages 11-21
Abstract
Abstract The present study was evaluated to determine effects of levamisole on growth and resistance of rainbow trout against density stress. For this purpose 1000 pieces fish (average weight of 150±6 g) were obtained from a local fish farm of Urmia and were divided in 5 test groups (33 kg/m3 ...
Read More
Abstract The present study was evaluated to determine effects of levamisole on growth and resistance of rainbow trout against density stress. For this purpose 1000 pieces fish (average weight of 150±6 g) were obtained from a local fish farm of Urmia and were divided in 5 test groups (33 kg/m3 density) and were fed on diet supplemented with levamisole at 0, 100, 250, 500 and 1000 mg per kg of diet for a period of 45 days. Then the fishes of all groups were fed on commercial diet without levamisole and were exposed density stress by 2-3 folds for the following 15 days. Biometry of fishes was done every 15 days and growth factors were measured. Results show that high level of levamisole (1000 mg/kg) had the lowest effect on growth factors of fishes. The maximum survival percent of fishes were observed in 500, 250, and 100 mg/kg Levamisole at the end of research and the level 1000 mg/kg Levamisole caused increase mortality of fishes into control group in density stress significantly (P
Ali Akbar Tafi; Saeed Meshkini
Volume 4, Issue 1 , September 2015, , Pages 35-44
Abstract
Abstract
In this study 900 rainbow trout (mean weight 25 gr) were obtained from a local fish farm in Urmia city and after acclimatization for 10 days, the fish were randomly divided into four groups (with three replication) and fed for 8 weeks with 0 (control), 2.5, 5 and 10 g chitosan/kg feed, respectively. ...
Read More
Abstract
In this study 900 rainbow trout (mean weight 25 gr) were obtained from a local fish farm in Urmia city and after acclimatization for 10 days, the fish were randomly divided into four groups (with three replication) and fed for 8 weeks with 0 (control), 2.5, 5 and 10 g chitosan/kg feed, respectively. Finally treatments were fed the control diet (without any chitosan) for another 3 weeks. Body weight, total length, food conversion rate, Special Growth Rate, Condition Factor and Daily weight gain were determined every two weeks and at the end of the trial. Data were analyzed using SPSS ver. 20. Results depicted no positive effects of chitosan on growth and nutritional parameters of rainbow trout. However, treatment four considerably (10 g chitosan/kg feed) inhibited live weight gain, total length increment and deteriorated food conversion rate (FCR) and specific growth rate (SGR) in comparison to control group and third treatment (5 g chitosan/kg feed).
