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12/11/2020

Menhaden Fish Kills Reported Along Connecticut Shoreline, DEEP Believes Due to Naturally Occurring Factors

Photo of Menhaden Fish

In the past month, DEEP Fisheries Division staff have received and investigated numerous calls of reported sightings of dead fish along the Connecticut shoreline, from Darien to New London, and numerous points in between. These incidents, known as fish kills, involve a species of fish called Atlantic Menhaden, also known as “bunker.”

Menhaden are the most abundant marine fish species on the east coast, and fish kills involving them are not uncommon. Menhaden fish kills can occur for a variety of reasons, most often due to natural or environmental factors such as school-induced hypoxia (lack of oxygen) or cold water temperature.

While DEEP continues to investigate these events, staff believe the cause of the fish kills observed over the past month have been due to more Menhaden overwintering in the Sound this year, possibly due to a missed migration cue, leading them to succumb to the cold water temperatures and a lack of nourishment.

 

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