Pseudobranchial X-cell pseudotumors in young wild and farmed atlantic cod Gadus morhua in Iceland.
This study investigated the prevalence of pseudobranchial X-cell pseudotumors in 2 year classes of wild juvenile cod and to a lesser extent in older cod in NW Iceland. The disease was also monitored in farmed wild-caught juvenile cod. The youngest wild cod detected that had X-cell infections were 6.5 to 13.0 cm in length, with prevalence reaching a maximum level of 7%. The highest prevalence (23%) was recorded in 18.5 to 27.0 cm fish. The mean prevalence in older cod (25.0 to 76.0 cm in length) was 7% but decreased with increasing age. The mean prevalence of X-cell pseudotumors in farmed juvenile cod was < or =1% during winter rearing in land-based tanks. Higher prevalence (2 to 15%) was noted in dead and moribund fish. Diseased farmed fish were usually emaciated, and mortality due to the disease was noticeable.
Eydal
M
M
Institute for Experimental Pathology, University of Iceland, Keldur, Vesturlandsvegur, IS-112 Reykjavik, Iceland. meydal@hi.is
Kristmundsson
A
A
Bambir
S H
SH
D000375:Aging; D000818:Animals; D017756:Aquaculture; D005393:Fish Diseases / Q000453:epidemiology / Q000473:pathology*; D048389:Gadus morhua; D006099:Granuloma / Q000453:epidemiology / Q000473:pathology / Q000662:veterinary*; D007055:Iceland / Q000453:epidemiology; D011529:Protozoan Infections, Animal / Q000453:epidemiology / Q000473:pathology*