Effects of river flow on abundance of young Chinook salmon, American shad, longfin smelt, and delta smelt in the Sacramento-San Joaquin River system
chinook, salmon, American shad, shad, smelt, flow rates, flow rate, spawning
Journal or Book Title
North American Journal of Fisheries Management
Annual abundance indices for young fall-run Chinook salmon (Oncorhynchustshawytscha), American shad (Alosa sapidissima), and longfin smelt (Spirinchus thaleichthys)increased directly with river flow rates during the spawning and nursery periods. Annualabundance of young delta smelt (Hypomesus transpacificus) did not vary with river flow. Severalfactors associated with flow could explain the relationships described for Chinook salmon,American shad, and longfin smelt. The one factor common to all affected species was thatdispersal of young increases when flows increase, which probably results in decreased densitydependentmortality.