草鱼鳃上台湾棘带吸虫囊蚴内种群的月变化
MONTHLY CHANGES OF THE METACERCARIAL CYST INFRAPOPULATION OF CENTROCESTUS FORMOSANUS (NISHIGORI, 1924) ON THE GILLS OF GRASS CARPS CTENOPHARYNGODON IDELLUS
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摘要: 通过对草鱼鳃上台湾棘带吸虫囊蚴内种群12个月的周期性研究,发现草鱼的感染率范围为2.1%-100%,感染强度范围为8.7-22.9,囊蚴的平均密度范围为.7-21.4;感染率、感染强度及平均密度三项指标与水温的周期性季节变化关系不明显;囊蚴在草鱼鳃上的分布呈聚集分布,且聚集的强度随囊蚴内种群密度的增高而增高;不同组鳃叶其囊蚴的分布具有相似的月变化规律.Abstract: The prevalence, mean intensity, relative density, abundance and dispersion of the metacercariae of Centrocestus formosanus (Trematoda: Heterophyidae) was studied on gills of grass carps Ctenopharyngodon idellus from August 1993 to June 1994. The prevalence varied from 62.1% to 100%, and the mean intensity 8.7 to 22.9, the relative density 6.7 to 21.4. The prevalence and mean intensity, relative density were not obviously correlated with the seasonal change of water temperature.The distribution of the metacercariae on the gills was overdispersed. The degree of aggregation increased with the increasing mean density of the cyst infrapopulation The distribution of the metacercarial cysts on the gills showed regular monthly changes with different gill lamellae.
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Keywords:
- Grass carp /
- Gill /
- Centrocestus formosanus /
- Metacercarial cyst infrapopulation
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