Abstract: Morphological characters and biochemical indicators， including body thickness （BT）， body height （BH）， body length （BL）， total length （TL）， body weight （BW） and concentrations of RNA， DNA and total protein in the muscle of Crucian carp， were determined. The relationships among above indicators were also analyzed. Data revealed that five indicators of BT， BL， TL， DNA concentration and protein/DNA had significant correlation with BW （P<005）. The direct effect of BT on BW was the highest （0587）， while the direct effect of DNA concentration on BW was negative， which influenced BW mainly through BT. The order of decision coefficients among above indicators with BW was DBT＞DRNA/protein＞DDNA. The codetermination effects on BW was the maximum（0313） for BT and DNA concentration， and the minimum （0007） for DNA concentration and RNA/protein. The relation between weight and morphological characters and biochemical indicators was established by multiple regression analysis. The results showed that power function relationship between DNA concentration and BW， exponential function relationship between protein/DNA and BW， and multiple regression relationship among the other indicators and BW were observed， respectively.

Key words: Crucian carp, body weight, morphological characters, biochemical indicators