Use of alternative protein sources for fishmeal replacement in the diet of largemouth bass ( Micropterus salmoides ). Pa
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ORIGINAL ARTICLE
Use of alternative protein sources for fishmeal replacement in the diet of largemouth bass (Micropterus salmoides). Part I: effects of poultry by‑product meal and soybean meal on growth, feed utilization, and health Xinyu Li1 · Shixuan Zheng2 · Xuekun Ma2 · Kaimin Cheng2 · Guoyao Wu1 Received: 28 August 2020 / Accepted: 13 November 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Five isonitrogenous and isocaloric diets [containing 54, 30, 15, 10, and 5% fishmeal crude-protein (CP), dry matter (DM) basis] were prepared by replacing fishmeal with poultry by-product meal plus soybean meal to feed juvenile largemouth bass (LMB, with an initial mean body weight of 4.9 g) for 8 weeks. All diets contained 54% CP and 13% lipids. There were four tanks of fish per treatment group (15 fish/tank). The fish were fed twice daily with the same feed intake (g/fish) in all the dietary groups. Results indicated that the inclusion of 15% fishmeal protein in the diet is sufficient for LMB growth. However, some of the fish that were fed diets containing ≤ 15% fishmeal CP had black skin syndrome (characterized by skin darkening and retinal degeneration, as well as intestinal and liver atrophies and structural abnormalities). The concentrations of taurine, methionine, threonine and histidine in serum were reduced (P
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