Fast growth, protein turnover and costs of protein metabolism in yolk-sac larvae of the African catfish (Clarias gariepinus)

被引:37
作者
Conceicao, LEC
Houlihan, DF
Verreth, JAJ
机构
[1] Agr Univ Wageningen, Dept Fish Culture & Fisheries, NL-6700 AH Wageningen, Netherlands
[2] Univ Aberdeen, Dept Zool, Aberdeen AB9 2TN, Scotland
关键词
larval fish; protein synthesis; protein turnover; protein synthesis costs; energetics;
D O I
10.1023/A:1007751130768
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
In fish larvae the costs of rapid growth may be accommodated by a decrease in the rate of protein turnover or by a reduction in the costs of protein synthesis. Protein growth, synthesis and degradation were measured in yolk-sac larvae of Clarias gariepinus and the costs of protein synthesis and protein growth were estimated. Growth rates were over 100% protein weight day(-1). Protein synthesis retention efficiency (retained protein per unit of synthesis) was estimated to be 69.6%, a value comparable to that of larger fish. The larvae used 43% of their oxygen consumption for protein synthesis. Nevertheless, protein synthesis costs were close to theoretical minima. Therefore, the high growth rates of catfish yolk-sac larvae seem to be possible through minimisation of the costs of protein synthesis. These low costs are associated with high rates of protein synthesis (138% protein weight day(-1)), and elevated RNA concentrations (107 mu g RNA mg(-1)protein), which together suggest very high RNA efficiencies (12.9 g protein synthesized g(-1)RNA day(-1)).
引用
收藏
页码:291 / 302
页数:12
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