It got worse and then it got better. Eyes on the Bay, a division of the Maryland Department of Natural Resources, says the oxygen level on the Chesapeake Bay was unusually high at the end of summer — that’s bad for fish. However, levels were down 5 percent overall for the season.
This animated map shows how the oxygen levels started unusually low at the start of summer and ended abnormally high.
— Eyes on the Bay (@eyesonthebay) October 7, 2016
The main culprit for the higher-than-average oxygen level appears to be the late summer heat wave that went on-and-on. High oxygen levels cause “dead zones” and kill fish. Here’s the full Hypoxia Report.