孤岛指环虫寄生于斑尾刺鱼叚虎鱼鳃空间分布的研究

Spatial Distribution of Parasite Dactylogyrus guodaoensis in Gills of Goby Acanthogobius ommaturus

通过对斑尾刺鱼叚虎鱼鳃上孤岛指环虫空间分布的研究发现,随着宿主体长的增加,其平均密度、感染强度及感染率均呈下降的趋势;从春季到秋季,孤岛指环虫的平均密度、感染强度和感染率均呈上升趋势,冬季呈迅速下降的趋势;斑尾刺鱼叚虎鱼鳃上孤岛指环虫的分布频率,表明大量的孤岛指环虫寄生于少数宿主鳃上,多数宿主感染少量的孤岛指环虫;孤岛指环虫种群在不同体长的宿主和不同季节均呈聚集性分布。

Based on the field investigation carried out from March of 2006 to April of 2007 in Lianyungang,Jiangsu Province,the spatial distribution of a parasite Dactylogyrus guodaoensis,in the gills of goby Acanthogobius ommaturus（Richardson）was reported.The results showed that the mean intensity,abundance and prevalence of D.guodaoensis population were negatively correlated with the body length of the host.From spring to autumn,the mean intensity,abundance and prevalence of D.guodaoensis were increased,while in winter,they were declined rapidly.The frequency distribution of D.guodaoensis in the gills of the host showed that a large number of D.guodaoensis existed in a small number of the host,and most hosts were infected with less D.guodaoensis.The population parameters of D.guodaoensis in the host of different groups of body length and in different seasons showed aggregated distribution.