Salmon on cocaine swim twice as far Researchers have found that salmon exposed to cocaine are swimming farther compared to their drug-free counterparts. 21 April 2026 Salmon exposed to cocaine are swimming significantly farther than their drug-free counterparts, scientists have revealed. Atlantic salmon In a new study, researchers found the illicit drug - increasingly detected in rivers and lakes - can dramatically alter how fish behave in the wild. The experiment tracked 105 juvenile Atlantic salmon over eight weeks in Sweden's Lake Vattern.