• Journal of fish pathology
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• v.8 no.1
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• pp.13-21
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• 1995

Four species of Actinosporeans, Aurantiactinomyxon sp. A, B, C and Neoctinomyxon sp. D were released from Oligochaete, Branchiura sowerbyi captured from three reserviors, where intestinal giant-cystic disease in carp had occured from June to September, 1994. All part of the intestinal epithelial tissue from the gullet to the anus of B. sowerbyi were infected by Actino-sporeans, and many mature Actinosporean were seen more easily at the posterior parts of the body. Just before releasing, mature Actinosporean sporozoites were divied into each individual from the intestinal epithelial tissue of Oligochaete, while immature ones had 6 spores ($20{\times}25{\mu}m$ in size) per each in the oocyst ($60{\times}65{\mu}m$ in size). A total of 1, 762 of B. sowerbyi were investigated in three reservoirs, 86 individuals (4.88%) of them were infected; 0. 74% (13 ind.) of Aurantiactinomyxon sp. A, 2. 27% (40 ind.) of Aurantiactinomyxon sp. B, 1. 59% (28 ind.) of Aurantiactinomyxon sp. C, and 0. 28% (5 ind.) of Neoactinomyxon sp. D. At the room temperature of 22.6-$30.7^{\circ}C$, number of extrusion dates of Actinosporeans from B. sowerbyi for 32 days are 1 day (23.3% of total, 1 time) or 5 days (11.7%. 5 times), and the majority was finished within 15 days, however, 6.7% of total were released for 32 days.

• Korean Journal of Ecology and Environment
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• v.46 no.4
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• pp.507-512
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• 2013

Aquatic oligochaetes were investigated from a small amount of sediment sampled from the Jungnang Stream, an urban stream in Seoul, Korea, in November 2012. Sorted oligochaetes were observed under a light microscope in a drop of carbonated water, and then preserved in 70% ethanol. Some specimens were slide mounted using glycerin and Eupharal. As a result, the following 12 species were identified including 8 new Korean records, Bothrioneurum vejdoskyanum Stolc, Branchiodrilus hortensis (Stephenson), Chaetogaster cristalinus Vejdosky, Nais communis Piguet, Nais pardalis Piguet, Dero obtusa d'Udekem, Piguetiella denticulata Liang, and Haemonais waldvogeli Brescher and 4 additional known species, Limnodrilus hoffmeisteri Cleparede, Branchiura sowerbyi Beddard, Chaetogaster diastrophus (Gruithuisen), and Stylaria fossularis Leidy. This study shows how freshwater oligochaetes are diverse even in urban streams in Korea, if a proper sampling and examining method is employed.