The present study evaluated the role of rice protein meal (RPM) as a cost-effective and widely available plant-based protein source in the diets of O. niloticus (Tilapia) and C. mrigala (Mrigal carp). 240 fingerlings were randomly assigned to 12 tanks after one week of the acclimation period. There were three-dietary groups: T0:Control, T1:RPM20, and T2:RPM35, each with two replicates for 90 days. Results showed that T2:RPM35% exhibited significantly higher zoo-technical (weight, PER, CF, SGR) performance. T2 showed higher weight gain (4.03 ± 0.02 a ) compared to T0 and T1 in Tilapia (P < 0.0001), and Mrigal carp had significantly higher weight gain in T1 (3.3 ± 0.16 a ) and T2 (3.70 ± 0.12 a ) treatments compared to T0 group (P < 0.02). Proximate body composition analysis revealed that T2 had significantly (P < 0.05) higher moisture, crude protein, and ash content compared to others. Notably, Tilapia in the T0 group exhibited higher crude fat levels, in the same manner Mrigal carp in T2 showed similar results. Additionally, the activity of protease and amylase was significantly higher (P < 0.05) in T2 for both species. Histological analysis revealed that T2 enhanced nutrient absorption and reduced lipid accumulation. T2:RPM35% was most effective in promoting sustainable growth and improving nutrient utilization in both species.
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Asad et al. (2025) studied this question.
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