Recently the East Bay has seen a renaissance of the native coastal rainbow trout in the watershed, and some have been spotted in the creek in Downtown Richmond nesting in submerged shopping carts and other garbage. The fish have also been spotted in Tilden Regional Park in the Berkeley Hills near the park's merry-go-round and a population makes its way up the creek from Lake Anza every spring to spawn. A second native fish, the three-spined stickleback ("Gasterosteus aculeatus") thrives in the creek and its tributaries.