While pollock is often held up as a prime example of sustainably sourced seafood-industry groups claim it is 'one of the most climate-friendly proteins in the world'-the reality is far more murky.
Trawlers' bycatch includes failing fisheries like Chinook salmon-whose population has declined so much that residents on the Yukon River who rely on them are prohibited from catching any for the next seven years.
Critics warn that years of disrupting marine habitat and food webs have contributed to massive population collapses in other species like seals and crabs.
The factory trawlers drag huge nets that sweep up catches by the ton, regularly scraping the bottom of the seafloor for miles at a time.
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