How to Make It
Melt butter in a Dutch oven over medium heat. Add marshmallows, stirring until melted; remove from heat. Stir in rice cereal until blended.
Press cereal mixture into a buttered 13- x 9-inch pan. Let stand 15 minutes, and cut into 2 1/2- x 1-inch rectangles. Top each bar with a fish-shaped candy.