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Subject:Spring Fish Kills

Dear Friends and Neighbors,

We have reeceived a few emails regarding dead fish in the Pond this spring.

 Spring fish kills are actually not uncommon in Massachusetts ponds and lakes, and there are several natural causes that could be responsible.

As ice melts and water temperatures begin to rise, ponds experience a turnover of water layers, which can lead to temporarily low oxygen levels, especially in shallow or nutrient-rich bodies of water like Demond Pond. Additionally, the stress of winter conditions—such as prolonged ice cover that limits oxygen exchange—can weaken fish, especially more sensitive species, making them more vulnerable to even small environmental changes in the spring.

It’s important to clarify that no weed treatments or chemical applications have been done in Demond Pond since late last summer. Furthermore, the herbicides used in such treatments biodegrade quickly and are not persistent in the environment. Therefore, weed treatment is not a contributing factor to the current situation.

If the fish kill is widespread or continues, it may be appropriate to notify the Massachusetts Division of Fisheries and Wildlife so they can evaluate the cause and advise on any necessary action. In most spring cases, however, nature resolves the imbalance on its own as the water warms and oxygen levels stabilize.

If you are concerned or the numbers of fish observed increases greatly, call the Massachusetts Environmental Police 1 (800) 632-8075 to report a fish kill 

Please continue to share any observations—community awareness is a key part of keeping Demond Pond healthy.

Warm regards,
John P. King
President, Demond Pond Watershed Association

View from in front of our cottage 9/6/2024