The number of fish killed in the outbreak of Koi Herpes Virus in New York\
's Chautauqua Lake has risen to over 20,000.
According to a report from the Toledo Blade, most of the fish affected have been in the shallow waters at the southern end of the lake.
This follows with what one would expect from a KHV outbreak, since the virus tends to kill most fish when the water is at a high temperature.
The Toledo Blade says that virologists have, as yet, been unable to trace the route by which the disease came to enter the lake.