![]() He is co-author of the 2017 book, Floodplains: Processes and Management for Ecosystem Services. He is author or co-author of more than 240 publications, including the definitive Inland Fishes of California (2002). Peter Moyle is the Distinguished Professor Emeritus in the Department of Wildlife, Fish and Conservation Biology and Associate Director of the Center for Watershed Sciences, at UC Davis. Most Bull trout mature at around four or five years of age, and spawning probably took place in September or October when food was most abundant for hatching fry. Historically, it is thought that the McCloud River population was fluvial, with fish growing in large pools in the lower river before migrating upstream to spawn in smaller tributaries. Adult Bull trout in rivers and smaller streams prefer to live on the bottom in deep pools, and presumably, McCloud River Bull trout fed on abundant Chinook salmon eggs and juveniles year-round. Bull trout can express a variety of life histories, including a) adfluvial, where juveniles grow in streams, migrate to lakes to mature, and then adults migrate to spawn in their natal streams, b) fluvial, where all stages live in streams, but adults migrate to small tributaries for spawning), c) stream resident fish with no separation of life history stages, or d) anadromous, where immature fish and adults undertake repeated estuary and/or ocean migrations to attain large sizes and seek more abundant sources of prey. Photo: Mike Wier Bull trout require extremely cold, clear water that historically was present in springs in the McCloud River and some of its tributaries. McCloud River, ideal habitat for Bull trout. Integrate Wild Fish and Working Landscapes.
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