We have river otter, mink, and raccoon. The bigger species have been foiled, but the small, slender mink continues to find the tiniest flaw in a screen or door frame to slide through and eat fish. We need to trap mink in order to keep our fish healthy. Biosecurity is jeopardized when the mink enters the raceway from outside water sources, where virus and bacterial pathogens exist. Stress resulting from mink attacks can lead to disease outbreaks. Disturbances also put the salmon off feeding, which can lower their resistance to pathogens and parasites and limit their growth.