ISSN:
1573-5168
Keywords:
larval herring
;
protein synthesis
;
growth
;
energetics
;
protein turnover
;
protein synthesis costs
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Rates of growth, protein synthesis and oxygen consumption were measured in herring larvae, Clupea harengus, in order to estimate the contribution that protein synthesis makes to oxygen consumption during rapid growth at 8°C. Protein synthesis rates were determined in larvae 9 to 17 d after hatching. Larvae were bathed in 3H phenylalanine for several hours and the free pool and protein-bound phenylalanine specific radioactivities were determined. Fractional rates of protein synthesis increased 5 to 11 fold with feeding after a period of fasting. Efficiencies of retention of synthesized protein were approximately 50% during rapid growth. Rapid growth in herring larvae thus appears to be characterized by moderate levels of protein turnover similar to those obtained for larger fish. Increases in growth rate occurred without changes in RNA concentration, i.e., the larvae increased the efficiency of RNA rapidly. Oxygen consumption rates were not correlated with growth rates. Protein synthesis was estimated to account for 79% of the oxygen consumption, and energy costs of protein synthesis were high, i.e., about 98 mmole O2 g−1 protein synthesized.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00004310
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