Abstract:The morphological parameters of 30 Hexagrammos otakii individuals ( body length between 22.3 and 36.5cm ) were observed and measured. The structure of their digestive system was observed by anatomic method. The correlation equation of total length and body length was: LB= 0.848 9LT+1.030 9( R2 = 0.978 ). The correlation equation of weight and body length was: W= 0.021 1 L2.992 7B（R2=0.833 7）. The countable characteristics includes dorsal fin rays, anal fin rays, pectoral fin rays, ventral fin rays, caudal fin rays, lateral line, lateral line scales, pyloric caecum, and the first gill arch raker. The parameters were as follows: dorsal 38～43, anal 18～22, pectoral 5～7, ventral 17～18, caudal 13～15; lateral line 5; lateral line scales 80~128; pyloric caecum 27~36; the first gill arch raker 16~19. The digestive tract is consisted of clearly distinguishable oesophagus, stomach and intestine; the intestine twisted two times and the relative length was 0.801±0.01. The morphology of the digestive tract was consistent with the specie's flesh-food habits.
