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Partial replacement of fish meal with spray-dried blood powder to reduce phosphorus concentrations in diets for juvenile rainbow trout, Oncorhynchus mykiss (Walbaum)

J. M. Luzier·R.C. Summerfelt·H. G. Ketola
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Abstract

Feeds formulated with 5.7, 11.4 and 22.7% spray-dried blood powder, also called blood flour (88.1% protein, 0.2% total phosphorus), were compared with a control diet with 49% herring meal (64% protein, 2.1% total phosphorus) and no blood powder for rearing juvenile rainbow trout. Oncorhynchus my kiss (Walbaum). Diets with 5.7, 11.4 and 22.7% blood powder contained 1.22,1.03 and 0.84% phosphorus, respectively, compared with 1.36% phosphorus in the control diet. Over 12 weeks, differences in mean specific growth (range 2.23-2.35 day −1 ) or feed conversion (range 1.04-1.09) among the four diets were not significant ( P > 0.05). Apparent digestibility of phosphorus in the diet with 22.7% blood powder was greater (45.2%) than that in the control diet (31.6%). Increases in phosphorus concentrations in the water in which trout were fed diets with blood powder (range 16-20 μg −1 total phosphorus) were 33-47% less ( P <0.05) than in tanks where trout were fed the control diet (30μg −1 total phosphorus). Feed formulations for rainbow trout prepared with 22.7% blood powder and 17.0% fish meal would contain 65.3% less fish meal and 38% less total phosphorus than present in the control diet, which was a representation of a modern feed formulation for rainbow trout.

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J. M. Luzier, R.C. Summerfelt, H. G. Ketola. 1995. Partial replacement of fish meal with spray-dried blood powder to reduce phosphorus concentrations in diets for juvenile rainbow trout, Oncorhynchus mykiss (Walbaum). https://doi.org/10.1111/j.1365-2109.1995.tb00948.x

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