UNDIAGNOSED DIE-OFF, FISH - USA (04): (WISCONSIN) CRAPPIE
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Date: 6 May 2011
Source: Wausau Daily Herald [edited]
<http://www.wausaudailyherald.com/article/20110506/WDH0101/105060482/Fish-Lake-DuBay-found-dead-from-virus?>
Fish in Lake DuBay found dead from virus
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Thousands of black crappies on Lake DuBay and the Stevens Point Flowage are dead of a virus and wildlife officials are trying to figure out why the disease is affecting just one species.
Wisconsin Department of Natural Resources (DNR) biologists and fisheries technicians learned of the fish kill on 25 Apr 2011, and determined that the cause appears to be a virus primarily affecting 3 year old black crappies.
"(If it was a widespread problem) other fish would be dying," DNR fisheries biologist Tom Meronek said. "This is just limited to crappies. We've seen cases on other bodies of water (in Wisconsin).
This might be a similar virus."
The signs are not consistent with viral hemorrhagic septicemia, or VHS, a virus that has sickened or killed large numbers of fish in the Great Lakes, according to the DNR. Wisconsin has mandated in recent years that all water must be drained from boats to prevent the spread of VHS and other viruses and diseases.
Live fish were taken from both bodies of water for testing, Meronek said. It will be several weeks before the DNR Fish Health Lab in Madison has results. The sickened fish aren't likely to bite anglers'
hooks, Meronek said. They likely will have lesions or look sick, and he doesn't advise eating them.
In Lake DuBay, the kill has been widespread and has covered many areas of the water with concentrations of dead fish, particularly along Seagull Drive in the town of Knowlton and extending south.
In the Stevens Point Flowage, fish were reported dying Sunday [1 May 2011]. The fish kill there also is widespread and affects crappie aged
3 to 4 years. Biologists also are trying to determine why some of the fish have a fungus on their dorsal fins.
Du Bay Property Owners Association's Kevin Coleman was not aware of the fish kill when asked on Thursday [5 May 2011] by a reporter.
Coleman said he saw a number of dead fish last weekend during a fishing tournament, but the fish were small and he did not think the fish were crappies. "I didn't think much of it at the time," he said.
Coleman said he already had plans to meet next week with association board members and plans to discuss the fish kill with them.
[byline: Jeff Starck]
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communicated by:
HealthMap Alerts via ProMED-mail
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[A fungus on the dorsal fin, and only on 3-4 year old crappie is very odd. Koi herpes virus is a virus that affects specifically carp or members of the genus _Cyprinus_. However, crappie are not part of this genus. While any virus may mutate, this seems unlikely; but perhaps testing will yield more specific information.
The article does not tell us how large the fish kill is, but if was not that noticeable to some, it may not be a big kill, yet. We look forward to more information regarding the testing of this unusual disease in these fish.
A photo of a crappie may be seen at
<http://pond.dnr.cornell.edu/nyfish/Centrarchidae/black_crappie.html>.
- Mod.TG
The interactive HealthMap/ProMED map for Wisconsin is available at <http://healthmap.org/r/00Pq> - CopyEd.EJP]
[see also:
Undiagnosed die-off, fish - USA (03): (AR), RFI 20110107.0085 Undiagnosed die-off, fish - USA (02): (MD) 20110106.0058 Undiagnosed die-off, fish - USA: (AR), freshwater drum
20110104.0035
2010
---
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20100718.2408
Undiagnosed die-off, fish - USA (07): (HI) puffer fish
20100716.2384
Undiagnosed die-off, fish - USA (06): (PA, ID) 20100716.2373 Undiagnosed fish die-off - USA (05): (MI) RFI 20100618.2056 Undiagnosed fish die-off - Canada: (ON) 20100613.1987 Undiagnosed fish die-off - USA (04): (WV, OH, PA) columnaris
20100610.1946
Undiagnosed fish die-off - USA (03): (WV, OH, PA) 20100601.1827 Undiagnosed fish die-off - USA (02): (NJ) koi herpesvirus susp.
20100528.1773
Undiagnosed die-off, fish - USA: (NY), viral hem. septicemia susp.
20100519.1649
Undiagnosed die-off, fish - Kenya: (Lake Naivasha) 20100221.0592] .................................................sb/tg/ejp/sh/ll
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