鳔等睾吸虫对寄主瓦氏黄颡鱼的影响

对从嘉陵江北碚江段采集到的264尾瓦氏黄颡鱼的调查表明,瓦氏黄颡鱼感染鳔等睾吸虫的感染率和感染强度分别为25.70%和1.50;体长在12～18 cm的个体感染的可能性增大,而体长在14～15 cm之间的个体感染率最高,为38.00%;此外还比较了感染鱼和未感染鱼的肥满度(F)、脂肪系数(ASI )、肝系数(HSI),发现鳔等睾吸虫对瓦氏黄颡鱼的肥满度有显著影响,感染鱼的肥满度下降了16.20%,对脂肪系数、肝系数的影响不显著.感染鱼的肝脏、肠系膜等器官均有不同程度的病变.

The Influence of Isoparorchis hypselobagri on Its Host,Pelteobagrus vachelli

From December 1998 to June 1999, two hundred and sixty-four Pelteobagrus vachelli (Richardson) collec-ted from the Jialing River in Beibei area were examined for Isoparorchis hypselobagri. The infection rate and intensity were 25.70% and 1.50, respectively. Individuals with the body length ranging from 12 to 18 *!cm had higher infection levels, with those ranging from 14 to 15*!cm having the highest infection rate 38.00%. The comparison of the fullness, adiposomatic index (ASI) and hepatosomatic index (HSI) of infected fish with those of uninfected fish showed that the fullness of the infected fish decreased by 16.4%. The effect of Isoparorchis hypselobagri on the fullness of the fish was remarkable. The differences of ASI and HSI between infected and uninfected fish were not observed. Pathological changes in the organs of the infected fish such as liver, mesentery and air bladder.were caused in varying degrees.