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Cold Weather May Lead to Fish Kills
FWC requests that residents report fish kills so they can investigate

Posted Dec. 10, 2010

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As temperatures drop in Florida, the number of cold-related fish kills is likely to increase. Chilly winter temperatures can lead to fish die-offs in Florida's marine
habitats, rivers and lakes.

The good news is that these events are natural occurrences and typically do not cause permanent damage to the ecosystem or to fish populations. In some cases they
are even beneficial, in that they help limit the spread of invasive, exotic species. Fish kills are often caused by sudden temperature fluctuations or by extended
periods of extreme temperatures. Such kills can occur any time of the year in Florida, but they are most common in winter, when air temperatures drop. Although
water stays relatively warm for awhile after the air cools, extended cold snaps can cause water temperatures in inland water bodies and estuaries to drop. The cold may
kill fish outright by cold stress or weaken them so that they are more susceptible to disease. Another phenomenon, called lake-turnover, may occur when suddenly cooled
surface water sinks and mixes with deeper, oxygen-poor water. This can cause fish to suffocate, often leading them to gulp at the surface before they die.

Warm-water species, including popular game fish like snook, are particularly vulnerable to cold temperatures. Exotic species such as butterfly peacock bass,
tilapia, and sucker-mouth catfish are also especially susceptible to cold weather. Fish affected by the cold may appear lethargic and may be seen at the surface where
the water may be warmer from the sun. All recreational regulations still apply to fish impacted by the cold temperatures, even if they appear to be dead or dying.

It is important for FWC scientists to keep track of the location and extent of fish kills in natural lakes and estuaries, to see if there are problems developing in an
ecosystem that might require investigation or restorative measures. Although it is not necessary to report fish kills in private ponds, FWC scientists can assist the
public by providing information about cold-weather fish kills in these water bodies.

Residents can report fish kills in natural water bodies to the FWC at or call the FWC Fish Kill Hotline at
800-636-0511. For more information on fish kills, visit
and select "Fish and Wildlife Health" under the "Explore" section.

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