first record of neoergasilus japonicus (poecilostomatoida: ergasilidae), a parasitic copepod new to the laurentian great lakes.the parasitic copepod neoergasilus japonicus, native to eastern asia, was first collected from 4 species of fish (fathead minnow, pimephales promelas; largemouth bass, micropterus salmoides; pumpkinseed sunfish, lepomis gibbosus; and yellow perch, perca flavescens) in july 1994 in saginaw bay, lake huron, michigan. further sampling in the bay in 2001 revealed infections on 7 additional species (bluegill, lepomis macrochirus; carp, cyprinus carpio; channel catfish, ictalurus punctatus; goldfish, ...200212197110
examination of reproductive endpoints in goldfish (carassius auratus) exposed in situ to municipal sewage treatment plant effluent discharges in michigan, usa.effects of representative mid-michigan (usa) wastewater treatment plant (wwtp) effluents on the reproductive physiology of common goldfish (carassius auratus) were assessed in situ by measuring plasma concentrations of vitellogenin (vtg), 17 beta-estradiol (e2), and testosterone (t), and evaluating gonad histology. caged adult male and female goldfish were exposed for six weeks to wwtp effluents. one riverine site and one lacustrine site were included as references for comparison to wwtp sites. ...200314552007
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