Eff ects of irradiated Ergosan on the growth performance and mucus biological components of rainbow trout <i>Oncorhynchus mykiss</i> -- Journal of Oceanology and Limnology,2016,34(1):13-18

	Cite this paper:
	Najmeh SHEIKHZADEH, Fatemeh CHEHRARA, Marzieh HEIDARIEH, Katayoon NOFOUZI, Behzad BARADARAN. Eff ects of irradiated Ergosan on the growth performance and mucus biological components of rainbow trout Oncorhynchus mykiss[J]. Journal of Oceanology and Limnology, 2016, 34(1): 13-18

Eff ects of irradiated Ergosan on the growth performance and mucus biological components of rainbow trout Oncorhynchus mykiss

Najmeh SHEIKHZADEH¹, Fatemeh CHEHRARA^1,2, Marzieh HEIDARIEH², Katayoon NOFOUZI³, Behzad BARADARAN⁴

1 Department of Food Hygiene and Aquatic Animals, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran;
2 Nuclear Science and Technology Research Institute, Karaj, Iran;
3 Departments of Pathobiology, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran;
4 Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran

Abstract:

Eff ects of irradiated and non-irradiated Ergosan extract (alginic acid) on rainbow trout growth performance and skin mucosal immunity were compared. Ergosan was irradiated at 30 kGy in a cobalt-60 irradiator. A total of 252 fi sh (128.03±9.4 g) were randomly divided into four equal groups, given the basal diet either unsupplemented with Ergosan (control group) or supplemented with crude Ergosan (5 g/kg), ethanol-extracted Ergosan (0.33 g/kg) or irradiated Ergosan (0.33 g/kg) according to this protocol: basal diet for 15 days, treatment diet for 15 days, basal diet for 10 days and treatment diet for 15 days. Highest growth performance was observed in fi sh fed irradiated Ergosan ( P < 0.05). Dietary administration of diff erent Ergosan types did not cause any changes in mucus protein level, but improved alkaline phosphatase level and hemagglutination titer compared with the control (basal diet without Ergosan) on day 55 of feeding trial ( P < 0.05). Furthermore, the highest value of lysozyme activity was observed in gamma-irradiated Ergosan on day 55. In conclusion, gamma-irradiated Ergosan at 0.33 g/kg was found to improve growth performance and mucus biological components signifi cantly in comparison with the control group (basal diet without Ergosan).

Received: 2014-11-24 Revised: 2015-02-26

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Articles by Behzad BARADARAN

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