Moravec F, Scholz T
Institute of Parasitology, Academy of Sciences of the Czech Republic.
J Helminthol. 1995 Mar;69(1):59-64. doi: 10.1017/s0022149x00013845.
From April 1992 until June 1993, the seasonal dynamics of Rhabdochona hellichi (Srámek, 1901) in its definitive host, the barbel (Barbus barbus), was studied in the Jihlava River (the Danube basin), Czech Republic. The parasite occurred in barbel throughout the year (overall prevalence 93% and intensity of infection 1-1384 [mean 78] nematodes per fish), but there were distinct seasonal fluctuations in prevalence and mean intensity values associated with the parasite's seasonal cycle of maturation. Prevalence was very high (usually 100%) during most months of the year, while lowest values were recorded in August and October. The highest values of mean intensity occurred in April. Both prevalence and mean intensity values increased with the body length of the hosts. The parasite exhibited a distinct annual cycle of maturation with egg-producing females present only from June until August, whereas larvae occurred in barbel mostly from September until April of the next year. Trichopteran (caddis-fly) larvae of the genus Hydropsyche (H. angustipennis and H. pellucidula) were found as natural intermediate hosts of R. hellichi (prevalence 4%, intensity 1-10 nematode larvae). The strictly seasonal maturation of this nematode may be associated with the temperature regime in the locality and seasonal cycles of maturation of its intermediate hosts.
1992年4月至1993年6月，在捷克共和国伊赫拉瓦河（多瑙河流域）对终末宿主须鲃（Barbus barbus）体内的黑氏似蛔线虫（Rhabdochona hellichi，Srámek，1901）的季节动态进行了研究。该寄生虫全年存在于须鲃体内（总体感染率93%，感染强度为每条鱼1 - 1384条线虫[平均78条]），但感染率和平均感染强度值存在明显的季节性波动，这与寄生虫的季节性成熟周期有关。一年中大部分月份感染率都非常高（通常为100%），而8月和10月记录到的感染率最低。平均感染强度的最高值出现在4月。感染率和平均感染强度值均随宿主鱼的体长增加而升高。该寄生虫表现出明显的年度成熟周期，产卵雌虫仅在6月至8月出现，而幼虫大多在9月至次年4月出现在须鲃体内。发现纹石蛾属（Hydropsyche）的毛翅目（石蛾）幼虫（窄翅纹石蛾H. angustipennis和透明纹石蛾H. pellucidula）是黑氏似蛔线虫的天然中间宿主（感染率4%，感染强度为1 - 10条线虫幼虫）。这种线虫严格的季节性成熟可能与当地的温度状况及其中间宿主的季节性成熟周期有关。
