Shaw R W, Hervio D M, Devlin R H, Adamson M L
Department of Fisheries and Oceans, Pacific Biological Station, Nanaimo, British Columbia, Canada.
J Parasitol. 1997 Oct;83(5):810-4.
The myxosporean parasite Kudoa thyrsites is reported from a new host, Aulorhynchus flavidus, the tube-snout, collected near Vancouver, British Columbia, Canada. Prevalence reached 100% and intensity 1,535 pseudocysts per 2 cm length of fish. Polymerase chain reaction primers specific for K. thyrsites amplified a fragment of the small subunit rDNA and confirmed identification. These primers also allowed detection of K. thyrsites in young (< 4-mo-old) fish with no other apparent sign of infection. No inflammatory response or liquefaction of host tissue was associated with the infection. The number of pseudocysts per infected fish was not correlated with fish size or condition, although larger fish (total length) had larger pseudocysts (rs = 0.437, P < 0.001). This finding brings to 28 the number of potential hosts for the species. Kudoa thyrsites is a well recognized cause of soft flesh in netpen-reared Atlantic salmon in coastal waters of British Columbia. Tube-snouts are common in and around these netpens, and thus may be a significant host reservoir for K. thyrsites.
据报道，黏液孢子虫寄生虫库道虫（Kudoa thyrsites）寄生于一种新宿主——在加拿大不列颠哥伦比亚省温哥华附近捕获的黄腹管吻鲀（Aulorhynchus flavidus）。感染率达100%，感染强度为每2厘米鱼体长有1535个假囊肿。针对库道虫的聚合酶链反应引物扩增出小亚基核糖体DNA片段，从而确认了该寄生虫的身份。这些引物还能检测出未出现其他明显感染迹象的幼鱼（小于4月龄）体内的库道虫。感染并未引发宿主组织的炎症反应或液化。每条受感染鱼体内的假囊肿数量与鱼的大小或健康状况无关，不过体型较大（全长）的鱼体内的假囊肿更大（rs = 0.437，P < 0.001）。这一发现使该物种的潜在宿主数量增至28种。库道虫是不列颠哥伦比亚省沿海水域网箱养殖的大西洋鲑鱼出现鱼肉软化现象的一个公认病因。管吻鲀在这些网箱及其周围很常见，因此可能是库道虫的一个重要宿主库。
