The effect of replacing sugar beet molasses with wheat bran in the diet on growth performance, nutrition and composition of gastrointestinal bacteria of Common carp (Cyprinus carpio Linnaeus, 1758) fry

Document Type : Research Paper

Authors

1 Department of Fisheries and Aquatics, Mirzakochek Khan Fisheries Sciences and Industries Training Unit, Agricultural Research, Education and Extension Organization Rasht, Rasht, Iran.

2 Shahid Ansari Fish Culture and Propagation Center, Rasht, Iran.

3 Department of Fisheries, Faculty of Fisheries and Animal Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

10.22059/jfisheries.2025.397200.1462

Abstract

This study was conducted to determine the effects of sugar beet molasses on improving growth, digestibility and bacterial load of the digestive tract of common carp fry (Cyprinus carpio) at the Shahid Ansari Center for Reproduction and Restoration of Bone Fish Stocks in Gilan. Sugar beet molasses was replaced with part of the wheat bran in the diet at four levels of 1.5, 3, 4.5 and 6%. Also, a diet without beet molasses was used as a control diet. In this experiment, 300 common carp fry (28.38±1.87 g) were reared for 8 weeks in 5 treatments with 3 replications (20 fish per tank). The results of growth parameter measurements showed that different levels of sugar beet molasses in the diet of common carp fry increased the percentage of body weight gain (BWI%), specific growth index (SGR), protein and fat digestibility compared to the control treatment (P<0.05). The number of gram-positive and gram-negative bacteria in the digestive tract of fry and the water of the rearing tanks was significantly different between the treatments containing sugar beet molasses and the control treatment (P<0.05). The feed conversion ratio (FCR) showed a significant difference between the treatments containing 1.5, 3 and 4.5% sugar beet molasses compared to the control treatment (P<0.05). The best performance of growth indices was observed in the treatment fed with 4.5% sugar beet molasses replaced with bran in the diet. Increasing sugar beet molasses in the diet by more than 4.5% did not affect the performance of growth indices compared to the control treatment (P>0.05). Based on the results of this study, in order to improve growth parameters, wheat bran can be replaced with sugar beet molasses at a level of 4.5% in the food composition of common carp fry.

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References

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Journal of Fisheries
Volume 78, Issue 4
December 2025
Pages 323-336

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