Transmission of Loma salmonae (Microsporea) to ...

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Title Transmission of Loma salmonae (Microsporea) to chinook salmon in sea water
Author(s) M. L. Kent, S. C. Dawe, David J. Speare
Journal The Canadian Veterinary Journal. La Revue Veterinaire Canadienne
Date 1995
Volume 36
Issue 2
Start page 98
End page 101
Abstract Transmission studies were conducted to determine if Loma salmonae was transmissible in sea water. Transmission of L. salmonae to chinook salmon (Oncorhynchus tshawytscha) held in sea water was achieved by exposing fish to macerated, infected gill tissue. Fish were exposed in seawater in a flow-through aquarium, and the infection was detected as soon as 5 wk after exposure. Heavily infected fish exhibited numerous xenomas in the branchial arteries, central venous sinusoids, and within the blood channels of the lamellae. The pathological changes were similar to those seen in pen-reared salmon with L. salmonae infections. The infection was not observed in Atlantic salmon (Salmo salar), Pacific herring (Clupea pallasi, family Clupeidae), or shiner perch (Cymatogaster aggregata, family Embiotocidae), experimentally exposed using identical methods. This study suggests that L. salmonae is transmissible to chinook salmon in seawater netpens. Fish farmers and fish health specialists should consider this possibility when developing and implementing strategies to control the infection.

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