A fully vaccinated OBI Seafoods worker at the company's Wood River plant in Dillingham, Alaska tested positive for COVID-19, KDLG reported.
The worker at the facility, one of several that operates during the upcoming Bristol Bay salmon fishery, reportedly tested positive on Monday but was asymptomatic.
In line with official guidance the worker went into isolation.
OBI, the salmon and groundfish joint venture owned by Canadian seafood giant Cooke and community development quota (CDQ) group Bristol Bay Economic Development Corporation (BBEDC), is now stepping up testing, the report said.
Cases of people who are vaccinated against COVID-19 testing positive for the disease remain rare.
Last year's Alaska salmon season saw multiple outbreaks across the state and forced some temporary facility closures.
In April OBI Seafoods announced it will suspend its cannery operations at its Excursion Inlet plant in southeast Alaska this summer citing poor salmon forecasts.
The Alaska salmon season began May 17 with the Copper River salmon fishery. Only three openings have taken place on the grounds amid dismal catches.