Paul finds himself in an idyllic little place on a freshwater river in the Caribbean foothills of central Costa Rica. It's an area that is remote and unique with a wide variety of fish species and to help Paul locate a few is Peter Gourinski. They're fishing for Matchaka, a fish that is similar to Shad, looks like Trout, but has very sharp teeth and is part of the piranha family. Paul and Peter start their fishing next to Mount Arenal, an active volcano that occasionally spurts out puffs of smoke and ash. Then the two raft down the rapids on the Saripiqui River to see what lies further down.