What does "low oxygen levels" mean? It's when the water contains less than 5 micrograms per liter of oxygen. The scientific term is "biological stress." The New Jersey DEP also found the lowest oxygen level was at 3.4 micrograms per liter -- this water sample was from Pierce's Point in Middle Township, the area with the most dead fish.

On Monday, residents on an island close to Fairhaven, Mass., were struck with a terrible odor: thousands of dead fish on the shores of their beach. Two days later and 200 miles away, beachgoers on the Jersey Shore stumbled across an even worse sight: Tens of thousands of dead menhaden fish splayed ashore for more than eight miles along the Delaware Bay, with tons still floating in the lapping waves.

When the state DEP began investigating the cause, experts said one reason the sensitive species died is "warm waters that have depleted the oxygen," a marine fisheries employee told KSAT.

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