The effect of different levels of carrot powder in angel fish (Pterophyllum scalare) diet on the growth performance and activity of digestive and antioxidant enzymes

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Document Type : scientific research article

Author

Department of Fisheries, Faculty of Natural Resources and Environment, Malayer University, Malayer, Hamadan, Iran.

Abstract

This study was aimed to assess the effect of carrot powder as a natural source of carotenoid on growth performance, digestive enzymes and antioxidant activity in angel fish (weight: 2.76 ± 0.28) for 8 weeks. Five experimental diets, including the control diet (D1: without carrot powder) and diets containing carrot powder (D2: 0.5%, D3:1%, D4: 1.5 % and D5: 2%) were prepared as isonitrogenous and isocaloric in triplicate. The results obtained from body weight gain, specific growth rate and protein & lipid efficiency ratio showed that they were significantly higher in fish fed with diets D4 and D5 compared to diet D1 (P<0.05). Fish fed with D4 diet significantly showed lower food conversion ratio compared to fish fed with D1 diet (P<0.05). The condition factor and the survival rate showed no significant difference among the experimental diets. The results obtained from digestive enzymes analysis of fish intestine showed that trypsin and amylase were significantly higher in D4 and D5 than those from D1 and D2 (P<0.05); while no significant difference was observed among fish fed with D3, D4 and D5 diet. The results of antioxidant enzymes assessment from fish tissue indicated that SOD and catalase in fish fed with diets containing carrot powder had a significant decrease compared to control group in both before and after stress (P<0.05). Based on the results obtained from this study, the growth performance, digestive enzymes and antioxidant activity in fish fed with diets containing carrot powder especially in high level (1.5 and 2 %) were significantly higher than those from control group.

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Journal of Utilization and Cultivation of Aquatics

Articles in Press, Accepted Manuscript
Available Online from 22 September 2024

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