The effects of sub-lethal salinity concentrations on the anti-predator responses of fathead minnows

► We exposed minnows to three levels of salinity and three levels of risk cues. ► Minnows exposed to increasing salinity showed a reduction in anti-predator responses. ► Threat-sensitive behavioural responses were absent in moderate and high salinity. ► Modified behavioural responses are evident well below physiological tolerance.