Golléty Claire, Connors Vincent A, Adams Ann M, Roumillat William A, de Buron Isaure
Department of Biology, College of Charleston, 58 Coming Street, Charleston, South Carolina 29401, USA.
Dis Aquat Organ. 2005 Jun 14;65(1):69-74. doi: 10.3354/dao065069.
This is the first report of the philometrid nematode Margolisianum bulbosum Blaylock and Overstreet, 1999 from the southern flounder Paralichthys lethostigma on the east coast of the USA. Observation of adult female worms was used as an indication of the parasite's presence in the fish. Adult females were found only in P. lethostigma >50 mm total length. The overall prevalence was 74%, with a mean intensity of 5 female nematodes per parasitized fish. Infected flounders were found throughout the year with a statistically significant decrease in intensity in the winter months. Neither salinity, water temperature, fish gender nor fish age were found to influence either prevalence or intensity of infection in the flounder. While larvigerous (gravid) females were found throughout the year, the significant decrease in their occurrence during the summer through fall, in concert with an observed decrease in intensity of infection during the winter, indicated that the life cycle of this philometrid species is likely to be annual.
这是关于1999年布莱洛克和奥弗斯特里特发现的球茎玛氏线虫（Margolisianum bulbosum）的首份报告，该线虫寄生于美国东海岸的南方鲆（Paralichthys lethostigma）体内。通过观察成年雌虫来确定寄生虫在鱼体内的存在情况。仅在全长大于50毫米的南方鲆体内发现了成年雌虫。总体感染率为74%，每条被寄生的鱼体内雌线虫的平均感染强度为5条。全年均发现有被感染的鲆鱼，冬季感染强度有统计学意义上的显著下降。未发现盐度、水温、鱼的性别及年龄对鲆鱼的感染率或感染强度有影响。虽然全年均发现有携带幼虫（怀卵）的雌虫，但夏季至秋季其出现数量显著减少，同时观察到冬季感染强度下降，这表明该种费氏线虫的生命周期可能为一年。
