Abstract: The nutritional compositions in muscle of seven fresh water cultured fishes,such as moisture,ash,crude protein,lipid,amino acids and fatty acids,were determined by national standard methods.The results showed that the moisture was between 74.7% ~ 80.5%. The most contents of crude protein,ash and lipid were 20.5%( Ctenopharyngodon idella),1.4%( Ophiocephalus argus Cantor) and 11.9%( Carassius auratus),respectively.The total content of amino acids were between 15.4% and 16.8%( fresh weight); the ratio of essential amino acids to total amino acids( W_EAA / W_TAA) were between 40.4% and 43.5%( fresh weight); the ratio of essential amino acids to non- essential amino acids( W_EAA/ W_NEAA) were between 86.8% and 94.2%( fresh weight).The first limiting amino acids of the seven fishes were all Met + Cys. The most of EEAI of Siniperca chuatsiwas 85.8,and was the best nutritional foods for supplementing amino acid balancedly.The highest nutrition value of fatty acids was Carassius auratus,the total fatty acids,EPA and DHA of which were 3.79%,0.01% and 0.16%,respectively. The ratio of Linolenic acid was 6.3,which was the nearest to the dietary reference intakes for Chinese.This paper can give some basic data for the culturing and processing fresh water fishes