FILE -- Tens of thousands of dead bunker fish have been washing up in the Peconic Bay area. (Credit: CBS2)

RIVERHEAD, N.Y. (CBSNewYork) — Thousands and thousands of dead, smelly bunker fish are floating in the Peconic River and washing up on the banks of a marina in Riverhead.

As WCBS 880 Long Island Bureau Chief Mike Xirinachs reported, it’s the second massive fish kill in the area in as many weeks.

Experts blame low oxygen levels for the kill, but what exactly is causing the problem remains a mystery.