A new report by the Environmental Protection Agency and the state Ecology Department determined that human sources of nitrogen are insignificant in contributing to the low-oxygen events that kill fish.
The Seattle Times reported that the study highlights the difficulty of understanding complex variables that can harm marine life.
The agencies concluded the overwhelming causes of fish kills in the Hood Canal are ocean conditions and the geography of the canal on the east side of the Olympic Peninsula. Water circulates poorly in the waterway and fish die at times from lack of oxygen.
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