ISSN:
1095-8649
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
This study aimed to measure protein synthesis using a stable isotope method, investigate protein-nitrogen flux in a flatfish Pleuronectes flesus, and use the data to test the hypothesis that individual differences in growth efficiency were related to individual differences in protein-nitrogen flux mediated through differences in protein synthesis and degradation. Three measurements of protein-nitrogen flux via consumption, protein synthesis and nitrogenous excretion were made for individual flounder during a 212-day period and fractional rates of protein-nitrogen flux were scaled for a 50–g flounder to provide mean values for protein consumption (2·11 ± 0·21% day−1), protein synthesis (2·08±0·23% day−1), protein growth (0·71±0·06% day−1) and protein degradation (1·37±0·24% day−1). Mean rates of nitrogenous excretion were 0·142 mg N g−1 day−1 and 0·047 mg N g−1 day−1 for ammonia and urea, respectively. Individual flounder had different protein growth efficiencies and this was correlated negatively and significantly with mean rates of protein synthesis (r - 0·70; P〈0·05) and degradation (r - 0·67; P〈 0·05) and correlated positively and significantly with the efficiency of retaining synthesized protein (r+0·63, P〈0·05). This supported the proposed hypothesis that flounder which grow more efficiently achieve this through adopting a low protein turnover strategy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1095-8649.1998.tb00980.x
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