大鳍鳠鱼体能量密度及其预测模型

于2000年11月至2001年10月由嘉陵江收集野生大鳍鳠成鱼100尾，其中冬季(12月)、春季(3月)、繁殖前(6月)、繁殖后(8月)、秋季(10月)雌雄各10尾。测定了这10个样本的鱼体能量密度及生化组成。统计分析结果表明：鱼体各生化成分含量，能量密度的性别间差异在各个季度均不显。在雌性群体中，秋季样本的蛋白质含量(16．23％)，脂肪含量(5．84％)，干物质含量(26．67％)和能量密度(6．14kJ／g)显高于其余各样本的相应指标。春季样本中鱼体脂肪含量和能量密度最低(2．39％，4．55kJ／g)。在雄性群体中，秋季样本的蛋白质含量(16．34％)与能量密度(5．85kJ／g)最高；春季样本中脂肪含量(1．3l％)、干物质含量(22．49％)、能量密度(4．16k．J／g)最低。各样本能量密度均分别与干物质和脂肪含量呈显的直线相关关系。通过协方差分析，将雌性群体中冬季、春季、秋季以及繁殖后样本共4个样本的能量密度与干物质含量的公共回归方程作为以干物质含量(D)预测大鳍鳠雌性群体在非繁殖期能量密度(E)的预测模型：E=-5．573 0．437D；将繁殖前雌性样本的能量密度与干物质含量的回归方程作为预测大鳍鳠雌性群体在繁殖期的能量密度的预测模型：E=-0．605 0．250D；将冬季、春季、秋季以及繁殖后雄性4个样本的能量密度与干物质含量的公共回归方程作为预测大鳍鳠雄性群体在非繁殖期的能量密度的预测模型：E=-6．046 0．456D；将繁殖前雄性样本的能量密度与干物质含量回归方程作为预测大鳍鳠雄性群体在繁殖期的能量密度的预测模型：E=-3．64 0．366D。

THE MODELS FOR PREDICTING ENERGY DEBSITY OF FISH BODY IN MYSTUS MACROPTERUS

From December,2000 to October,2001,100 fishes of Mystus macropterus were collected in Winter,Spring,spawing period,spent period and Autumn in the Jialing River.Of which there were 10 males and 10 females respectively in a sample during each season.The energy density and composition of the fish body were measured.The result showed that there was no significant difference of either body composition or energy density between males and females in each season.In the female,the protein content(16.23%),energy density(6.14kJ/g),lipid content(5.84%),and dry mass content(26.67%)in the Autumn were significant higher than those in any other samples.In the Winter,the female has the lowest lipid content(2.39%)and the energy density(4.55 kJ/g).In the male,the highest energy density(5.85kJ/g)and protein content(16.34%)appeared in Autumn,and the lowest 1ipid content(1.31%),energy density(4.16kJ/g),dry mass content(22.49%)appeared in the Spring.There was significantly linear relationship in each sample between energy density and either dry mass or lipid content,respectively.By analysis of covariance(ANCOVA)on the regression equations of energy density(E:kJ/g)to dry mass(D:%B.W.)in the 10 samples,four equations were developed as the predicting models for the different samples.The first model is for the female samples in Winter,Spring,post-spawing and Autumn i.e.non-spawing seasons:E=-5.573+0.437D;the second one for the females in spawing period:E=-0.605+0.250D;the third one is for the male samples in Winter, Spring,post-spawing and Autumn i.e.non-spawing seasons:E=-6.046+0.456D,and the fourth one for the male sample in spawing period:E=-3.64+0.366D.