黄鳝体内寄生隐藏新棘虫和胃瘤线虫的频率分布及季节动态

SEASONAL DYNAMICS AND FREQUENCY DISTRIBUTION OF THE ENDOPARASITES PALLISENTIS(NEOSENTIS)CELATUS AND EUSTRONGYLIDES SP. IN THE RICE FIELD EEL MONOPTERUS ALBUS

  • 摘要: 寄生虫的感染会对黄鳝(Monopterus albus Zuiew,1793)造成不利影响,其中寄生其肠道的隐藏新棘虫(Pallisentis(Neosentis)celatus van Cleave,1928)和寄生于体腔的胃瘤线虫幼虫(Eustrongylidessp.)对黄鳝健康的影响尤其严重,研究调查了以上两种寄生蠕虫在黄鳝体内的频率分布以及季节动态。在连续23个月内共调查黄鳝1980尾,结果显示,隐藏新棘虫的感染率为34.46%,平均丰度为2.948.37,平均丰度与鱼类体长之间呈显著正相关关系(R=0.16,P0.05),平均丰度和聚集度在42 cmL48 cm体长组达到最大值后开始下降,呈现凸形曲线。胃瘤线虫幼虫感染率为15.14%,平均丰度为0.612.45,平均丰度与鱼类体长之间呈显著负相关关系(R=-0.14,P0.05),平均丰度在24 cmL30 cm体长组达到最大值后开始逐渐下降,聚集度是在30 cmL36 cm体长组达到最大值后开始下降。各月份间隐藏新棘虫的平均丰度和感染率都有显著性差异(F=10.50,P0.05;G=84.440.05222= 33.9),感染主要发生在春季和秋季;胃瘤线虫幼虫各月份间的平均丰度和感染率也都有显著性差异(F=6.70,P0.05;G =143.88 0.05222= 33.9),感染主要发生在春末夏初。

     

    Abstract: The acanthocephalan Pallisentis (Neosentis) celatus (van Cleave, 1928) in the intestine and nematode Eustrongylidessp. in the body cavity is harmful to the health of the rice field eel Monopterus albus (Zuiew, 1793). In our study, the population dynamics and frequency distributions of the two helminths were investigated in the period from May 2006 to March 2008. The prevalence and mean abundance of P. (N.) celatus (van Cleave, 1928) of the 1980 individuals of M. albus, was 34.46% and 2.94 8. 37, respectively. The mean abundance was positively related with the body length of the fish (R= 0.16, P0.05). Whereas the highest mean abundance and variance to mean ratio were observed in the fish body length group of 42 cm L48 cm, then declined gradually and showed convex curves. The prevalence of Eustrongylidessp. was 15.14% and the mean abundance was 0.61 2.45.The mean abundance was negatively related with the body length of the fish (R = -0.14, P0.05). The highest mean abundance was observed in the fish body length group of 24 cm L30 cm, and the highest variance to mean ratio was found in the group of 30 cm L36 cm. The prevalence and mean abundance of P. (N.) celatus were higher in spring and summer. There were significant differences in the prevalence and mean abundance of theacanthocephalan among different months (G = 84.44 0.05222= 33.9; F = 10.50, P0.05). The prevalence and mean abundance of Eustrongylidessp. were higher in late spring and early summer, and significant differences were also found in different months (G = 143.88 0.05222= 33.9; F = 6.70, P0.05).

     

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