Abstract: The comparative morphological characteristics of teeth,tongue,gill rakers,stomach,pyloric caeca,liver,pancreas,and gallbladder were described in adult taimen(Hucho taimen) and chum salmon(Oncorhynchus keta).The body length,head length,snout length,mouth breadth,mouth length,and the lengths of esophagus,stomach,intestine and digestive tract were measured and some relevant ratios were calculated in both taimen and chum salmon.The results showed that the taimen and chum salmon had typical digestive tract characteristics of the carnivorous fish including big mouth,a ratio of oropharyngeal length to head length=0.62~0.71,and short intestine with intestinal length / body length =0.69.The clear mucosal folds were observed in the inner process of esophagus,stomach and intestinal walls.A separate and developed liver and pancreas was found and the relationships between section of the digestive tract,the feeding habits and morphological characteristics of the digestive system were discussed.

Key words: Hucho taimen, Oncorhynchus keta, digestive system, anatomy, food habit analysis