Rainbow Trout This popular fish is native to the tributaries of the Pacific Ocean in North America and Asia. Now it can be found farmed as a food source or for recreational angling across the world. Rainbow Trout are a premier fish desired by anglers for recreational fishing in California. Those provided for recreational angling are now sterile (triploid (PDF)). Brown Trout Brown Trout, also known as German Brown Trout, are native to Eastern Europe, but were historically planted into many California waters for recreational fishing. These days, sterile Brown Trout (triploid (PDF)) continue to provide anglers a quality fishing experience. Fillmore Hatchery main page