seasonal fish – Groups of dead fish were reported at Leverett Pond on the Boston–Brookline line and along the Muddy River to the Back Bay Fens, with residents also spotting fish along the Charles River Esplanade. Officials say the die-offs—dubbed “fish kills”—are a seasonal p
The first thing people notice is the floating. the sheer number of them—an unsettling scatter of dead fish where you don’t expect to see them. Over Memorial Day weekend. park rangers responded to reports of large groups of dead fish washing ashore. first at Leverett Pond on the border of Boston and Brookline.
Dead fish were also seen along the Muddy River to the Back Bay Fens, according to a Boston Parks and Recreation Department spokesperson. City residents took notice too. One Reddit user said they saw “at least 10-15 bloated and floating fish corpses” in the Charles River Esplanade.
Wildlife officials cautioned that residents shouldn’t assume something sinister is at work. Park rangers described the scenes as “fish kills,” and they were not initially treated as an emergency. MassWildlife was involved. and the Massachusetts Environmental Police were “notified and not initially concerned.” Park rangers. MassWildlife. and the Town of Brookline will continue to monitor what’s happening.
Massachusetts Environmental Police were not initially concerned. but the odd sight still prompted follow-up—because fish kills can look shocking even when officials say the mechanism is familiar. Boston Parks and Recreation said fish kills are a natural seasonal event. As warm weather arrives. ponds heat up and oxygen levels in the water can decrease. stressing fish populations and occasionally leading to seasonal fish kills. At this time, officials said, there is “no indication of a public safety concern.”.
The season matters biologically, too. Spring and summer are when many warmwater fish species begin to spawn. according to the Division of Fisheries and Wildlife website. The biological competition in crowded waters can contribute to fish kills. The website describes how large numbers of these species crowd in shallow shoreline waters vying for spawning sites—and that crowded areas are susceptible to disease outbreaks. The “result,” the website says, is an unavoidable natural fish kill, usually involving one or two species of fish.
In this case, the fish at Leverett Pond were mostly common carp that had recently spawned, leaving them weaker and more vulnerable to stress from low oxygen levels, MassWildlife said. Low water levels were also likely a contributing factor.
The weekend didn’t just bring reports in Boston’s neighborhoods and waterways. A much larger fish kill—numbering nearly 1,000 fish—was spotted at University Park in Worcester over the weekend. MassWildlife said that incident. like the others. was caused by “low water levels and high temperatures resulting in low dissolved oxygen.”.
For residents who stumble on a fish kill and want to report it, officials say to contact the Massachusetts Environmental Police at 1-800-632-8075.
dead fish fish kill Leverett Pond Boston Brookline Muddy River Back Bay Fens Charles River Esplanade MassWildlife Massachusetts Environmental Police University Park Worcester dissolved oxygen