Saving Seafood

Mollusks in Oregon coast watersheds contain forestry pesticides, study says

May 11, 2021 — Oysters, estuarine clams and freshwater mussels in watersheds along the Oregon coast contain pesticides used in managing forests, according to a study funded by Oregon Sea Grant.

Researchers from Portland State University found pesticides in 38 percent of the tissue samples. Indaziflam, an herbicide currently used in Oregon forestry, was found in about 7 percent of the samples. Contaminants also included pesticides used in orchards, Christmas tree farms and homes, as well as banned pesticides, including DDT byproducts.

The study, published in the journal Toxics, may help guide forest management practices to reduce the amounts of forestry chemicals entering aquatic ecosystems.

The study was led by Kaegan Scully-Engelmeyer, a doctoral student in the earth, environment and society program at PSU, and PSU marine ecologist Elise Granek.

They collected tissue samples from freshwater western pearlshell mussels — softshell clams typically found in the upper area of estuaries — and Pacific oysters. They collected them from watersheds along the Oregon coast in 2017 and 2018. These organisms are good indicators of environmental contamination because they are sedentary filter feeders.

Read the full story at the Newport News Times

Microplastics in vast majority of Oregon shellfish, study finds

November 13, 2019 — A Portland State University study found tiny pieces of plastic in the vast majority of razor clams and oysters sampled along the Oregon coast and noted that the primary source of contamination was from fibers used in synthetic textiles.

Those microscopic fibers can be shed by yoga pants, fleeces and other active wear made of synthetic textiles during a wash — up to 700,000 per load of laundry, according to the study, which was reported on Tuesday in The Oregonian/OregonLive. These fibers are in the wastewater from laundry machines that eventually winds up in the ocean, although some of the tiny plastic fibers could also come from derelict fishing gear, the newspaper said.

The shellfish in question were plucked from 15 sites, from Clatsop in the north to Gold Beach near the California border, in both the spring and summer of 2017. Of the roughly 300 shellfish analyzed, all but two contained at least some microplastics, Elise Granek, a PSU professor of environmental science and management, said.

The study was published in the journal Limnology and Oceanography Letters.

Read the full story from the Associated Press at KOMO