Record Display for the EPA National Library Catalog


Main Title New Eye Disease in Pen-Reared Chinook Salmon Caused by Metacestodes of 'Gilquinia squali' (Trypanorhyncha).
Author Kent, M. L. ; Margolis, L. ; Fournie, J. W. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL. ;Department of Fisheries and Oceans, Nanaimo (British Columbia). Pacific Biological Station.
Publisher 1991
Year Published 1991
Report Number EPA/600/J-94/276;
Stock Number PB94-191020
Additional Subjects Salmon ; Parasitic diseases ; Eye diseases ; Reprints ; Aquaculture ; Mortality ; Retina ; Cataracts ; Morbidity ; Onchorhynchus tshawytscha ; Gilquinia squali
Library Call Number Additional Info Location Last
NTIS  PB94-191020 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
Eye infections by metacestodes of Gilquinia squali (Cestoda: Trypanorhyncha) were associated with mortality in chinook salmon Oncorhynchus tshawytscha reared in net-pens in seawater at two separate locations in British Columbia. Mortality associated with the disease was about 10% at one site and undetermined at the second site. The metacestode was found in the vitreous humor of moribund fish with eye lesions, whereas healthy fish from the same pen exhibited neither eye lesions nor the infection. The lesions were characterized by retinal folding and apparent retinal duplication, and cataractous changes; in severe cases, the cornea ruptured, and the lens was extruded. The spiny dogfish Squalus acanthias is the definitive host for the cestode. Spiny dogfish were prevalent in and around the affected net-pen sites, thus providing coracidia to infect the first intermediate host, which is most likely a crustacean. Although the metacestode is common in the eyes of European whiting Merlangius merlangus in the northeast Atlantic region, this is the first report of the infection in a salmonid.