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Partial replacement of fishmeal with corn protein concentrate in diets for rainbow trout ( Oncorhynchus mykiss ): Effects on growth performance, physiometabolic responses, and fillet quality
Author(s) -
Hosseini Shekarabi Seyed Pezhman,
Shamsaie Mehrgan Mehdi,
Banavreh Akbar,
Foroudi Farhad
Publication year - 2021
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.14887
Subject(s) - fish meal , biology , rainbow trout , fillet (mechanics) , zoology , food science , lysozyme , fishery , biochemistry , fish <actinopterygii> , materials science , composite material
Abstract An 8‐week feeding trial was run to investigate the replacement of fishmeal with corn protein concentrate (CPC; Empyreal ® ) in rainbow trou (100.5 ± 2.3 g) diet. Fishmeal was increasingly replaced with 0 (Control), 30 (CPC 3 ), 60 (CPC 6 ), 90 (CPC 9 ) and 120 (CPC 12 ) g/kg CPC. The results showed that the substitution of fishmeal with CPC up to 90 g/kg did not cause significant differences in the growth indices as compared to the control group, while further replacement resulted in the reduction of the growth performance. The fillet crude protein showed no significant difference between the control diet and diets containing up to 90 g/kg CPC ( p > .05). Serum biochemical parameters such as albumin and glucose did not change notably, while the highest levels of alanine aminotransferase and lactate dehydrogenase were seen in the CPC 12 group ( p < .05). Also, serum lysozyme activity was increased with the elevation of dietary CPC up to 90 g/kg ( p < .05). The redness and yellowness of the fillet were markedly elevated with the dietary incorporation of CPC ( p < .05). Taken together, the optimum range of fishmeal substitution with CPC was 81.0–82.2 g/kg CPC in rainbow diet based on the broken‐line regression analysis.