Assertion: salmon's contaminant | /r/CapableOf | spread to surrounding ocean
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text: Contaminants from ocean-based aquafarms, such as fish excrement, uneaten chemical-laden food, and swarms of parasites, spread to the surrounding ocean, and the rampant disease inside the enclosures is passed on to free-swimming fish in the area—even threatening some populations of wild salmon to the point of extinction.