Leo puts the team on a mission to help the scientists in Algonquin Provincial Park monitor Lake Trout, a super important predator indicator species. Right after the sun sets the trout love to spawn, so the FishHeads are heading out after dusk! Christian will net the fish, using all sorts of cool equipment to detect them. He brings his catch back to Sayat, who is all set to collect the data and determine just how healthy this population is!