大泷六线鱼的外形特征与消化系统结构

Morphological characteristics and structure of digestive system of Hexagrammos otakii

中文关键词: 大泷六线鱼  形态特征  消化系统

英文关键词: Hexagrammos otakii  Morphological characteristics  Parameters of morphology  Digestive system

中文摘要:

      观察并描述了大泷六线鱼的外部形态特征，详细测量了30个个体的大泷六线鱼外部形态参数，进行了相关关系分析；并解剖观察了其消化系统结构特征。外部形态参数全长( LT ) 与体长( LB )相关关系为LB= 0.848 9LT+1.030 9 ( R2 = 0.978)，体长与体重的关系为W= 0.021 1 LB2.9927，（R2=0.833 7），其余形态参数相关性较低；可数性状背鳍、臀鳍、腹鳍、胸鳍、尾鳍鳍条数分别为38～43、18～22、5～7、17～18、13～15；侧线5条；第3侧线鳞数80~128；第1鳃弓鳃耙数16~19；消化系统结构特征：口咽腔较小，颌齿发达；食道短粗；胃发达，具有27~36个幽门盲囊；胃发达且分化明显，肠在腹腔内呈两个盘曲，肠长/体长为0.801±0.01，表明大泷六线鱼为典型的肉食性鱼类。

英文摘要:

      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.