A westslope cutthroat trout in Banff National Park, where reintroduced populations are now spawning naturally in Hidden Lake. Facebook/Banff National Park..captiontext { font-size:90%;font-style: italic;margin-right:20px; } Efforts to bring back a threatened native fish in Banff National Park just hit a huge milestone, with westslope cutthroat trout now spawning naturally in Hidden Lake for the first time in generations. A Huge Milestone Parks C…