Preliminary results from a U.S. Bureau of Reclamation-led project show that a sound, air and light barrier was successful in keeping juvenile Chinook salmon in the San Joaquin River and out of Old River on their way to the ocean. Salmon migrating through Old River have a lower survival rate than salmon using the main stem San Joaquin River route.
In the past, a solid rock barrier was installed at the junction of the Old and San Joaquin rivers near Lathrop during the spring salmon migration period to keep the smolts out of Old River and away from the State and Federal water project diversion pumps.
Scientist Says Size Matters in Determining Smelt Feeding Preferences
The decline of delta smelt in the San Francisco Estuary has been linked to several possible factors: pumping facilities, predators, nutrients, contaminants, toxic algae, changes in temperature and salinity. Another possibility is changes in their food. Since the early 1990’s, there have been several changes in the prey (zooplankton) that are available to delta smelt and striped bass—which are also declining.
Save the date! Science Conference, Sept. 27-29, 2010
The CALFED Science Program coordinated an independent review panel in August to review the 2-Gates Fish Protection Demonstration Project—an experimental project where two temporary, removable gates would be placed in the central Delta in an effort to protect sensitive fish species and manage the water supply. The panel’s role was to evaluate the proposal’s scientific strengths and weaknesses as an experiment in reducing delta smelt entrainment.
How did the El Niño and La Niña climate phenomena get their names? Are there other climate systems important to California water and ecosystems?