Sunday, January 2, 2011

January 2, 2011 : Fish Kill

Fish Kill

The term fish kill is applied to a localized die-off of fish populations which may also be associated with more generalized mortality of aquatic life. It may result from a variety of causes, most frequently ecological hypoxia (oxygen depletion). The hypoxic event may be brought on by factors including high and temperatures, weather, drought, thermal pollution and algae blooms. Fish kills may also occur due to the presence of disease, agricultural sewage runoff, oil or chemical spill, hazardous waste spills, sea-quakes, inappropriate re-stocking of fish, underwater explosions, and other catastrophic events that upset a normally stable aquatic population.

Fish kills are often the first visible signs of ecological hypoxia and are usually investigated as a matter of urgency by environmental agencies to determine the cause of the hypoxic event and whether or not the cause was man made, due to pollution, or naturally occurring.

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