Young salmon swimming in the Willamette River are taking in toxins and dying before they can make it back out into the ocean, according to a recent study by NOAA Fisheries.
All the juvenile salmon tested were found within the Portland Harbor Superfund site just north of downtown Portland.
The study found toxins like PCBs and DDT are making their way into juvenile Chinook salmon through the food they eat in that area.
Here we model the impact of legacy chemicals on ESA-listed Chinook salmon (O. tsha- wytscha) that spawn in the upper reaches of the Willamette River Basin (henceforth referred to as Upper Willamette River; UWR) in Oregon, USA. Juveniles migrate seaward through histor- ically contaminated Portland Harbor, a designated Superfund site since 2000 (described in detail below).
As a result, those salmon, all less than a year old, are likely not surviving long enough to make it back to the ocean.
But the study also pointed out that there is one thing we can do to help the fish survive.
The researchers said if the contaminants are cleaned up, the salmon population in the Willamette River would increase significantly.