Since 1983, Held annually for over thirty years, the Clearlake Oaks - Glenhaven Catfish Derby is the largest catfish tournament west of the Mississippi. Each May hundreds of of eager fishermen and women visit Clear Lake for a chance to land the BIG ONE and win one of many prizes. The tournament features: separate divisions for adults and kids; food and entertainment; a $4,000 prize cash for the largest fish caught in the adult division; $100 for the largest fish caught in each of two kids divisions; over $10,000 total in cash and merchandise prizes. Registration and checkin begins on Thursday of Derby week at 12:00 noon at Derby Headquarters at the Clearlake Oaks fire station, 12655 E. Highway 20. Fishing starts at noon on Friday and ends at noon on Sunday.