Hundreds of striped bass were found dead this week in the Blackhall River, a tributary of the Connecticut River in Old Lyme, in what state Department of Energy and Environmental Protection officials believe was a natural die-off related to the extreme cold.
Five blue crabs also were found dead.
"We had the same thing happen last year," said David Simpson, director of marine fisheries in the agency's Bureau of Natural Resources. "It was pretty coincidental with the new moon, real low water, very cold weather."
He attributed the deaths, as best as DEEP staffers could determine, to "cold shock," possibly as a result of fish getting trapped in icy cold water by ice and shallow depth.
The DEEP also received reports in Old Lyme of fish drifting out of the Connecticut River and washing up on Long Island Sound beach, but Simpson said he believes those fish were part of the same die-off, which was first reported Sunday by an Old Lyme police officer.
"There's quite a few fish in there and the water really gets shallow during those extreme low tides," he said. "It was a pretty quick change of temperature. There was a salinity change ... I think they just got caught in it."
Since Sunday, "we've had a number of calls from the public," he said.
Some callers also mentioned a possible fish kill "down toward the New Haven area, but I haven't gotten any specific reports," Simpson said.
One key member of the Greater New Haven fishing community said he was unaware of any fish die-off in or around New Haven, where the Quinnipiac River, Mill River and West River all are popular with local fishermen.
"Bad news or good news travels fast on the water" and "usually, if somebody had seen something, somebody would have said something," said Pete DeGregorio, owner of Dee's Bait & Tackle at 93 Clay St. in New Haven's Fair Haven section, which has been outfitting area anglers for decades.
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