The California Department of Fish and Wildlife (CDFW) is experimenting to see how the state’s only native sunfish fares after being reintroduced in Sacramento ponds. The department recently stocked 3,000 juvenile Sacramento perch – from M4 Aquatics, a Livermore-based hatchery – into a pond at Granite Regional Park for fishing. … Sacramento perch were once abundant within the Sacramento-San Joaquin Delta and Clear Lake in northern California. But have been displaced from their historical range due to habitat modification and competition from non-native sunfish that were introduced into California in the early 20th century.