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Ahmad, I.G., Lamadi, A., Kalapati, R., Alvionita, M. and Lantu, I.S. 2026. Proximate Analysis of Papain Enzyme-Supplemented Feed and Its Effects on Protein Efficiency Ratio and Feed Utilization Efficiency in Freshwater Crayfish (Cherax quadricarinatus). Jurnal Ilmiah Samudra Akuatika. 10, 1 (Jun. 2026), 30-34. DOI:https://doi.org/10.33059/jisa.v10i1.14097.