Funding for this study project will be use track the swimming movements of salmon smolts during migration using acoustic transmitters and detection arrays near the confluence of Old River and the San Joaquin River. Analyses will be carried out to determine swimming velocity relative to current velocity. Modeling will estimate fish distribution; fish transit times; entrainment of fish into channels of the south Delta; and alternative water export management scenarios that may result in reduced entrainment.
Regents of the University of California
Project objectives are to:
1. Determine whether juvenile salmon remain immobile in the water column, being transported passively by the currents or whether they are active swimmers.
2. If they are active swimmers, whether they swim in random directions or they swim with persistent directionality relative to tidal currents.
3. If they are active swimmers, determine which environmental stimuli (current velocity, proximity to shore, etc.) trigger swimming behavior.
4. Determine whether night-time swimming behavior differs from daytime swimming behavior.
5. Describe any relationships between the export to inflow ratio and the survival of migrating downstream spring-run smolts.
6. Estimate the entrainment risk of juvenile salmon by water export facilities in the south Delta under different tidal and export conditions.
Research/Planning (including Science)
Project Benefits a Disadvantaged Community (or SDAC):