Abstract
A 12-week feeding trial was conducted to examine the effects of dietary protein concentrations on growth, whole-body chemical composition, and hepatic anti-oxidant enzyme activities of coho salmon Oncorhynchus kisutch (Walbaum, 1792) alevins. Five experimental diets were formulated with graded protein levels of 36.5%, 42.0%, 48.0%, 54.5%, and 60.0%, respectively, with each fed to triplicate groups of fish (0.36 ± 0.01 g). Stocked as groups of 50 individuals per tank (water volume of 240 L), fish were fed four times daily with the method of overfeeding (15–20% body weight). After the feeding trial, the specific growth rate (SGR) in groups fed diets with 48.0%, 54.5%, and 60.0% protein was significantly higher than that in the 36.5% protein group (P < .05). The feed conversion ratio (FCR) in 48.0%, 54.5%, and 60.0% dietary protein groups was significantly lower than that in the 36.5% protein group (P < .05). No significant differences were observed for hepatosomatic index (HSI), intestosomatic index (ISI), condition factor (CF), and whole-body composition, except the crude protein content, which increased significantly with the increment of dietary protein level up to 48.0% (P < .05) and then leveled off (P > .05). Dietary protein up to 48.0% significantly increased the activities of total superoxide dismutase (T-SOD) and catalase (CAT) and significantly decreased the malondialdehyde (MDA) contents in the liver (P < .05). The second-order polynomial regression analyses based on SGR indicated that the optimal protein requirement in diets of coho salmon alevins was 53.6%, which was concurrent with a protein to energy ratio of 25.8 g protein MJ−1.
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All the data in the article are available from the corresponding author upon reasonable request.
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Funding
This study was funded by Shandong Provincial Key Research and Development Programs (Major Scientific and Technological Innovation Projects, MSTIP), Grant/Award Numbers: 2018CXGC0102 and 2019JZZY020710; Scientific and Technologic Development Program of Weifang, Grant/Award Number: 2019ZJ1046; Innovation-Driven Development Special Project of Guangxi Science and Technology Major Project, Grant/Award Number: AA17204044; and Shandong Provincial Natural Science Foundation, Grant/Award Number: ZR2020MC174.
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Xu, Cm., Yu, Hr., Zhang, Q. et al. Effects of dietary protein concentration on growth and anti-oxidant capacity of coho salmon Oncorhynchus kisutch (Walbaum, 1792) alevins. Aquacult Int 30, 1563–1574 (2022). https://doi.org/10.1007/s10499-022-00837-3
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DOI: https://doi.org/10.1007/s10499-022-00837-3