Human-caused ‘dead zones’ threaten health of Puget Sound

During the summer of 2015, thousands of dead eels washed up on the beaches of the Hood Canal. These eels suffered a familiar fate for marine life in many parts of Puget Sound and its long, shallow offshoots when the level of dissolved oxygen in the water had become too low to support them.

Elsewhere in Puget Sound, large blooms of algae or jellyfish can be seen drifting in the currents, especially during summer months. These floats indicate that there’s too many nutrients in the water. Algae thrive on these nutrients, and when they die and sink to the bottom, the bacteria that decompose them sucks up oxygen, leaving

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