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Epizootiology of Erythrocytic Inclusion Body Syndrome
Author(s) -
Piacentini S. C.,
Rohovec J. S.,
Fryer J. L.
Publication year - 1989
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1989)001<0173:eoeibs>2.3.co;2
Subject(s) - oncorhynchus , rainbow trout , biology , epizootiology , salmo , hematocrit , trout , incubation , fish <actinopterygii> , zoology , fishery , incubation period , chinook wind , physiology , endocrinology , virology , biochemistry
Coho salmon Oncorhynchus kisutch were infected artificially with the virus that causes erythrocytic inclusion body syndrome (EIBS). A specific and consistent time course of infection was demonstrated for inclusion body number and hematocrit values. At 12°C, the inclusions appeared approximately 11 d postinjection and were most common near day 21. Hematocrit values were lowest at day 28. By day 30, inclusions disappeared, and hematocrits returned to normal by day 45. Fish that recovered from the disease were much less susceptible to reinfection, and their sera could be used successfully to passively immunize susceptible fish. The stages of the progression of EIBS were all discerned in infected fish held at temperatures of 6, 9, 12, 15, and 18°C, but as the temperature increased, the incubation time, time until maximum inclusions, duration of the inclusion stage, and the time until recovery decreased. Under laboratory conditions, the virus was transmitted horizontally, and rainbow trout Oncorhynchus mykiss (formerly Salmo gairdneri ) and cutthroat trout Oncorhynchus clarki (formerly Salmo clarki ) were infected by injection. The disease in these species was, however, less severe than in Coho salmon and chinook salmon Oncorhynchus tshawytscha .