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Estimation of growth potential by measurement of tissue protein synthetic rates in feeding and fasting rainbow trout, Salmo gairdnerii Richardson
Author(s) -
Smith M. A. K.
Publication year - 1981
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1981.tb05825.x
Subject(s) - rainbow trout , salmo , biology , muscle tissue , trout , medicine , tyrosine , endocrinology , protein biosynthesis , fish <actinopterygii> , biochemistry , fishery
Protein synthesis in liver, gill and muscle tissue was measured in vivo by constant infusion of 14 C‐tyrosine in fed and fasted freshwater rainbow trout, Salmo gairdnerii , at 12° C. Synthesis rates (percentage of tissue protein synthesized per day) were 15‐17% in liver, 4–5% in gill and 0.38% in muscle of fed fish. Liver and gill synthesis rate showed no significant change in fish that had been without food for 15 days, whereas muscle protein synthesis fell to 0.09%. The greater susceptability of muscle protein synthesis to fasting, possibly results from the greater proportion of synthesis retained as growth in this tissue. Growth rates indicate little change in protein turnover in the muscle but increased protein degradation with fasting. The difference between fed and fasted synthesis rates in muscle may be used as a measurement of potential growth rate for a particular species.