The effect of dietary phosphorus on the growth and body components of juvenile Syechogobius hasta was determined. Different percentages of dietary phosphorus （0.63, 0.77, 0.93, 1.06, 1.22 and 1.36） were tested by fe...The effect of dietary phosphorus on the growth and body components of juvenile Syechogobius hasta was determined. Different percentages of dietary phosphorus （0.63, 0.77, 0.93, 1.06, 1.22 and 1.36） were tested by feeding the fish （body weight, 15.81 ±：0.32 g; 20 individuals each group; 3 groups each percentage） at a surplus of 5%-10% above satiation for 35d. Dietary phosphorus did not significantly affect the specific growth rate, teed intake, feed conversion ratio and protein efficiency rate. Nitrogen retention was lbund to be the highest in fish fed the diet contatimg 1.06% of phosphorus; however, this was not significantly different from other diets. Fish ted the diet containing 0.93% of phosphorus showed the highest phosphorus retention; similar phosphorus retention rates were found in fish fed the diets containing 0.77% and 1.06% of phosphorus. Fish fed the diet containing the highest percentage of dietary phosphorus were found to contain the least whole body lipid, lower than fish fed other diets （P〈0.05）. The protein content increased from 18.59% to 19.55% （although not significant） with the decrease of body lipid content （P〉0.05）. The contents of the whole body ash, whole body phosphorus and vertebrae phosphorus increased with dietary phosphorus percentage up to 1.06 （P〈0.05）, reaching a plateau after that. Dietary phosphorus did not significantly influence the muscle components （protein, lipid and moisture）. Condition factor and hepatosomatic index were the highest in fish fed the diet containing 0.63% of dietary phosphorus; however, this was not significantly different from those of other diets. The second-order polynomial regression of phosphorus retention against dietary phosphorus identified a breakpoint at 0.88% of dietary phosphorus. However, the dietary requirement of phosphorus for maintaining maximum phosphorus storage determined by broken-line analysis of the contents of whole body phosphorus, and ash and vertebrae phosphorus was 1.06% of the diet.展开更多
记述中国新纪录属,曲管蓟马属 Sinuothrips Collins,2000,以及 1 新纪录种,剑曲管蓟马 S. hasta C ollins。更新了曲管蓟马属的属征,提供了新纪录种的形态描述、特征图以及 COⅠ序列。研究标本保存于中国科学院动物研究所国家动物博物...记述中国新纪录属,曲管蓟马属 Sinuothrips Collins,2000,以及 1 新纪录种,剑曲管蓟马 S. hasta C ollins。更新了曲管蓟马属的属征,提供了新纪录种的形态描述、特征图以及 COⅠ序列。研究标本保存于中国科学院动物研究所国家动物博物馆和澳大利亚国家昆虫收藏。展开更多
文摘The effect of dietary phosphorus on the growth and body components of juvenile Syechogobius hasta was determined. Different percentages of dietary phosphorus （0.63, 0.77, 0.93, 1.06, 1.22 and 1.36） were tested by feeding the fish （body weight, 15.81 ±：0.32 g; 20 individuals each group; 3 groups each percentage） at a surplus of 5%-10% above satiation for 35d. Dietary phosphorus did not significantly affect the specific growth rate, teed intake, feed conversion ratio and protein efficiency rate. Nitrogen retention was lbund to be the highest in fish fed the diet contatimg 1.06% of phosphorus; however, this was not significantly different from other diets. Fish ted the diet containing 0.93% of phosphorus showed the highest phosphorus retention; similar phosphorus retention rates were found in fish fed the diets containing 0.77% and 1.06% of phosphorus. Fish fed the diet containing the highest percentage of dietary phosphorus were found to contain the least whole body lipid, lower than fish fed other diets （P〈0.05）. The protein content increased from 18.59% to 19.55% （although not significant） with the decrease of body lipid content （P〉0.05）. The contents of the whole body ash, whole body phosphorus and vertebrae phosphorus increased with dietary phosphorus percentage up to 1.06 （P〈0.05）, reaching a plateau after that. Dietary phosphorus did not significantly influence the muscle components （protein, lipid and moisture）. Condition factor and hepatosomatic index were the highest in fish fed the diet containing 0.63% of dietary phosphorus; however, this was not significantly different from those of other diets. The second-order polynomial regression of phosphorus retention against dietary phosphorus identified a breakpoint at 0.88% of dietary phosphorus. However, the dietary requirement of phosphorus for maintaining maximum phosphorus storage determined by broken-line analysis of the contents of whole body phosphorus, and ash and vertebrae phosphorus was 1.06% of the diet.
基金supported by the National Science Funds for Distinguished Young Scientists (31025024)National ScienceFund for Fostering Talents in Basic Research (J1210002)+1 种基金a grant (O529YX5105) from the Key Laboratory of the Zoological Systematics and Evolution of the Chinese Academy of Sciencesthe Ministry of Science and Technology of the People's Republic of China (MOST 2011FY120200)
文摘记述中国新纪录属,曲管蓟马属 Sinuothrips Collins,2000,以及 1 新纪录种,剑曲管蓟马 S. hasta C ollins。更新了曲管蓟马属的属征,提供了新纪录种的形态描述、特征图以及 COⅠ序列。研究标本保存于中国科学院动物研究所国家动物博物馆和澳大利亚国家昆虫收藏。
