November 16, 2016 — Residents of Hampton Bays, N.Y., awoke Monday morning to find their local canal clogged with tens of thousands of silvery, dead fish. The bodies were packed together so tightly that it looked as though you could walk across them, one man told the local news channel News12. The air was thick with their noxious smell.
This was a classic fish kill — a massive die-off that occurs when too many fish are in a body of water with too little oxygen. Under ordinary circumstances, fish extract oxygen that has been dissolved in water as it filters through their gills. When the amount of dissolved oxygen is insufficient, the fish become hypoxic — they suffocate and die.
The New York Department of Environmental Conservation issued a statement saying the closing of locks at Shinnecock Canal early Monday inadvertently trapped a large school of Atlantic menhaden — small silvery fish also known as bunker — in the canal. The school of normally saltwater fish had probably been chased into the canal by predators.
“They chased them in here, but unfortunately the locks are closed so it’s just a dead end, they can’t get out,” Chris Paparo, a lab manager at Stony Brook University Marine Sciences Center, told the New York Daily News. “And with the sheer number of fish in here, it just sucks the oxygen out of the water and they suffocate.”