Seems that exposure to predators could be a good thing:
http://www.nature.com/srep/2013/130725/srep02259/full/srep02259.html
http://www.nature.com/srep/2013/130725/srep02259/full/srep02259.html
Damselfish exposed to predators had drastically higher survival suffering only 10% mortality while controls suffered 60% mortality 72 h after release.