Evaluation of serum protein pattern and growth parameters of rainbow trout (Oncorhynchus mykiss) fed with Bromelain diet.

Document Type : scientific research article

Authors

1 Gorgan University of Agricultural Sciences & Natural Resources

2 Department of fisheries

3 faculty member

4 Faculty member of Gorgan University of Agricultural Sciences and Natural Resources

5 Faculty member of Aquatic Breeding Department, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Golestan Province, Iran

10.22069/japu.2023.21709.1813

Abstract

The aim of this study was to evaluate how a bromelain diet affects the growth parameters and serum protein patterns of juvenile rainbow trout (Oncorhynchus mykiss). For the study, four groups of fish were used: one group was given a basic diet (control group) and the other three groups were given diets with varying concentrations of bromelain (0.5%, 1%, and 2%). Each treatment was replicated three times. A total of 300 fingerling rainbow trout, with an average weight of 2.5 ± 0.5 grams, were randomly placed in tanks containing 100 liters of water. The experimental diets were given for 8 weeks. Firstly, the fish were monitored for any significant differences in growth parameters and serum protein patterns. Secondly, the results were analyzed to determine the effects of the bromelain diet. Finally, the findings were used to draw conclusions. The research findings indicate an increase in peptide band density in the second (1 g) and third (2 g) treatments, and a decrease in the first treatment (0.5 g), as shown by the serum protein pattern. Although the examination of growth factors did not reveal any significant differences in body weight gain, percentage of body weight gain, specific growth rate, condition factor, and food conversion ratio (P≥0.05), the survival index of the experimental treatment group was significantly different from the control group (P≤0.05). In summary, the results suggest the positive impact of bromelain on increasing protein availability, growth, and survival in fish. Sequentially, the serum protein pattern displayed an increase in peptide band density in the second (1 g) and third (2 g) treatments and a decrease in the first treatment (0.5 g). The significant difference in the survival index of the experimental treatment group from the control group (P≤0.05) highlights the positive impact of bromelain on protein availability, growth, and survival in fish. The examination of growth factors did not reveal any significant differences in body weight gain, percentage of body weight gain, specific growth rate, condition factor, and food conversion ratio (P≥0.05). Nonetheless, the research findings provide valuable insight into the beneficial effects of bromelain on fish.

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Journal of Utilization and Cultivation of Aquatics
Volume 14, Issue 1
April 2025
Pages 209-220

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