New York State environmental officials say reports of dead fish along lakes and ponds during the spring thaw are usually a normal seasonal occurrence.
The Department of Environmental Conservation (DEC) says fish die-offs this time of year are often caused by environmental conditions that develop over the winter. Thick ice combined with heavy snow cover can block sunlight from reaching aquatic plants, limiting their ability to produce oxygen needed for fish to survive.
Officials say fish are also under added stress in early spring as many species begin spawning. Rapid changes in water temperature can lead to thermal shock, weakening fish and making them more vulnerable.
The DEC notes that similar die-offs can also occur in late summer and are typically not harmful to overall fish populations. In most cases, conditions improve naturally, and the issue resolves on its own.
However, the agency says residents who suspect a fish kill may be caused by pollution or other non-natural factors are encouraged to report it to the DEC for further investigation.
