Hedrick R P, Groff J M, McDowell T S
Department of Medicine, School of Veterinary Medicine, University of California, Davis 95616.
J Wildl Dis. 1990 Oct;26(4):558-60. doi: 10.7589/0090-3558-26.4.558.
Infections caused by a Sphaerospora sp. resembling S. chinensis are reported for the first time in goldfish (Carassius auratus) from North America. The myxosporean was found in the respiratory epithelium of the gill of pond-reared fish. Spores from stained tissue sections were spherical with an equal mean length and width of 6.3 microns. Spore valves were thickened at the suture which lies in a plane perpendicular to two prominent pyriform polar capsules. The polar capsules were 4.0 x 2.8 microns in length and width. Both monosporous and disporous development within a surrounding "pseudoplasmodium" was detected. Infections caused moderate hyperplasia and occasional necrosis of the respiratory epithelial cells of the gill.
首次报道在来自北美的金鱼（Carassius auratus）中发现由一种类似中华球孢虫（Sphaerospora chinensis）的球孢虫属（Sphaerospora sp.）引起的感染。这种粘孢子虫在池塘养殖鱼类鳃的呼吸上皮中被发现。染色组织切片中的孢子呈球形，平均长度和宽度相等，为6.3微米。孢子瓣在与两个突出的梨形极囊垂直的平面上的缝线处增厚。极囊的长度和宽度为4.0×2.8微米。在周围的“假原质团”内检测到单孢子和双孢子发育。感染导致鳃呼吸上皮细胞中度增生并偶尔出现坏死。
