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Dietary Requirements for Essential Branched‐Chain Amino Acids by Lake Trout
Author(s) -
Hughes Steven G.,
Rumsey Gary L.,
Nesheim Malden C.
Publication year - 1983
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1983)112<812:drfeba>2.0.co;2
Subject(s) - valine , trout , isoleucine , salvelinus , oncorhynchus , leucine , amino acid , chinook wind , biology , zoology , food science , chemistry , fishery , biochemistry , fish <actinopterygii>
In a 12‐week growth study of the dietary requirements of young lake trout Salvelinus namaycush for essential branched‐chain amino acids, the leucine requirement was between 2.74 and 3.66%, and the isoleucine requirement between 1.54 and 2.06%, of dietary protein (as‐fed basis). These ranges are substantially lower than those published and widely used in formulation of salmonid feeds. On the basis of both growth criteria and concentration of free amino acids in blood plasma, the valine requirement was within the range of 1.77 to 2.23% of dietary protein. The upper value of this range is substantially lower than the requirement reported for chinook salmon Oncorhynchus tshawytscha. Plasma valine concentrations in lake trout responded to dietary supplements of valine above the requirement level; the concentrations increased sharply once the requirement was exceeded. This finding is similar to observations recorded in other animals. Received February 4, 1983 Accepted August 7, 1983