[header] How to grill trout [title] Remove the trout's gills and guts. [step] Using a filet knife, make a straight cut on the bottom of the fish from the anal fin to the pectoral fins, stopping right before the gills. On the underside of the mouth, cut down on each side of the chin to create a v shape. 
Using scissors, cut from each of the pectoral fins to the trout's adjacent gills. Grab the mouth cuts and pull back to remove the guts and gills.