[MARINE_BIOLOGY_INTERNATIONAL] UNDIAGNOSED DIE-OFF, FISH - USA (02): (MARYLAND)

UNDIAGNOSED DIE-OFF, FISH - USA (02): (MARYLAND)
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A ProMED-mail post
<http://www.promedmail.org>
ProMED-mail is a program of the
International Society for Infectious Diseases <http://www.isid.org>

Date: 5 Jan 2011
Source: Baltimore Sun [edited]
<http://www.baltimoresun.com/features/green/bs-gr-fish-kill-bay-20110104,0,5624655.story#photo>

Cold believed cause for 2 million dead fish
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State officials say they are investigating a "very large" fish kill in the Chesapeake Bay, but suspect cold temperatures killed them, rather than any water-quality problems. An estimated 2 million fish have been reported dead from the Bay Bridge south to Tangier Sound, according to the Maryland Department of the Environment [MDE], which investigates fish kills. The dead fish are primarily adult spot, with some juvenile croakers.

Agency spokeswoman Dawn Stoltzfus said bay water quality appears acceptable, and biologists believe "cold-water stress" the likely cause of the fish kill. Spot are susceptible to colder water, she said, and normally leave the upper bay by now. Water temperatures plummeted in late December to near-record lows for that time of year, about 36 degrees F. The average air temperature last month was 32.4 degrees, 4.3 degrees below normal, and reached 16 degrees at its lowest, according to the National Weather Service.

Large winter kills of spot have been documented at least twice before, the MDE spokeswoman said, with about 15 million dying in early 1976 and a smaller number in 1980.

An earlier version had an incorrect number to report a fish kill. The Sun regrets the error.

[Byline: Tim Wheeler
<tim.wheeler@baltsun.com>]

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Communicated by:
T J Allen
<tjallen@pipeline.com>

[Water has frozen without resulting in fish kills before, unless of course the water freezes all the way to the bottom of the water source. However, this appears to be a cold water susceptible species, and younger fish of that same species. Surely some of these will be sent a diagnostic lab and additional reports will follow. - Mod.TG]

[The interactive HealthMap/ProMED map for Maryland is available at:
<http://healthmap.org/r/012S> - CopyEd.EJP]

[see also:
Undiagnosed die-off, fish - USA: (AR), freshwater drum 20110104.0035 2010
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