Recent rains caused a fish farm pond to overflow allowing hundreds of farmed salmon to escape by swimming across a road.
The salmon are bred and raised commercially in large tanks or ponds on fish farms to be sold to supermarkets.
Farm fish are less desirable than wild fish because farmed fish are fed a steady diet of plant-based hormones to fatten them up for the dinner table.
Humans who consume farm fish are exposed to high levels of hormones and other chemicals.
Consumers who eat wild caught fish say they notice a distinct difference in the taste between wild fish and farm raised fish.
Supermarkets are required by law to label salmon and other types of fish by the supply source: "farm fish" or "wild fish".