SummarySufficient flows and timing of flows for maintaining historically-present native fish. Native fish, including anadromous species, need sufficient in-stream water to complete life-cycles, forage, disperse, seek thermal refuge, and escape predation. General Information about this IndicatorWhat is it?: Native fish, including anadromous species, need sufficient in-stream water to complete life-cycles, forage, disperse, seek thermal refuge, and escape predation. These flows must also be at appropriate times of day, year and season to allow them to function naturally. This is a common aquatic ecosystem indicator in managed water systems.