YubaNet.com
Thursday, September 18 2014

            We Deliver News to the Sierra
News Fire News spacer Latest News spacer Regional News spacer California News spacer USA News spacer World News spacer Op-Ed spacer Enviro News spacer Sci Tech News spacer Life spacer Odd News spacer Cartoons spacer
Features The Calendar features features Weather features Sierra NightSky features features features Road Conditions features Home spacer
CA
 

CDFW Trucks Salmon Smolts to the Golden Gate to Help them Avoid Predators


    Google+    

By: California Department of Fish and Wildlife (CDFW)

April 7, 2014 - California Department of Fish and Wildlife (CDFW) biologists and the Commercial Salmon Trollers Advisory Committee are continuing an experimental project to help California's ocean-bound juvenile salmon, in hopes of increasing survival rates. On April 8, for the third year, CDFW staff will fill a boat with approximately 100,000 young Chinook (called smolts) and move it down the Sacramento River to San Francisco Bay. Upon arrival, the smolts will be released in the Bay, where they will swim into the sea and grow to adulthood before returning upriver to spawn.

The experimental project is being conducted by CDFW fisheries biologists with the support of the Commercial Salmon Trollers Advisory Committee, which donated the use of the boat, fuel and crew time to help ensure a successful start to the study. They have committed to helping CDFW continue data collection. The fishing vessel Merva W will receive 100,000 smolts into its hold in Rio Vista on the Sacramento River the morning of April 8.

This year's severe drought has only exacerbated the number of challenges facing salmon smolts migrating downstream. Salmon return to their spawning grounds using their sense of smell. The process, called imprinting, begins before birth as waters flow over the eggs and continues as they grow and make their way to the ocean. Each segment of water on their journey has distinctive chemical cues which they can re-trace to their spawning grounds. Water is circulated through pumps from the Sacramento River into the Merva W ‘s holding tank, where the fish are kept. The hope is that this may improve their ability to find their way back as adults. The trucking process also prevents that smolts from exposure to predators during the journey downstream.

This is the third year of a three-year experimental project to determine if barging improves smolt survival. Data collected over the next few years will be evaluated to determine if these fish had higher survival rates, if more of these fish make it back to the hatchery of origin and how this release strategy differs from others currently being used.

To form a basis of comparison for the experimental project, two other control groups of 100,000 smolts each will be released by trucks in other locations at the same time as the barge release -- one under the Golden Gate Bridge and one into the Sacramento River near Rio Vista. All 300,000 fish in this experimental project are implanted with coded wire tags smaller than a tiny piece of pencil lead, which will ultimately enable scientists to tell which of the three groups the returning fish came from -- the barge release, or one of the two truck releases.

Data collected from this experiment will help scientists to evaluate the efficiency of barging when compared to other release strategies, as well as to determine which group has better survival rates and how quickly the fish make it back to their natal hatcheries (improved stray rates).

The city of Rio Vista and the Tiburon Salmon Institute at the Romberg Center are providing access for the transport boat and fish trucks.

 

Help us bring you more news. Be a real reader: Support YubaNet

By submitting a comment you consent to our rules. You must use your real first and last name, not a nickname or alias. A comment here is just like a letter to the editor or a post on Facebook. Thank you.

 

Latest Headlines

CA

Governor Brown Declares State of Emergency in El Dorado and Siskiyou Counties

Satellite photo: Dry Conditions and Lightning Strikes Make for a Long California Fire Season

State Operations Center Activates in Full Support of the Statewide Fires

New Census Data Show That More Than 1 in 7 Californians -- One-Third of Them Children -- Lived in Poverty in 2013

Pilot Rescued After Plane Crash in Sequoia & Kings Canyon National Parks

Cause of Conway Fire Determined to Be Vehicle-Related

Op-Ed: Lynn Tramonte: California's Prop 187 Relegated to History Books: Will Obama and Democrats Read the Whole Chapter?

Dan Bacher: Winnemem Wintu War Dancers: Shasta Dam a 'Weapon of Mass Destruction'

People's Climate Train Leaves California En Route to Historic Climate March in New York City

Friends of the Earth: Nuclear regulator again rebuffs safety inspector's concerns of quake safety at Diablo Canyon


More

 

 

 

 

NEWS . Fire News . Latest . Regional . California . USA . World . Op-Ed . Enviro . Sci/Tech . Life . Odd News . Cartoons
FEATURES . The Calendar .Weather . Sierra NightSky . Horoscope . Road Conditions
YubaNet.com . Advertising. About Us . Support YubaNet . Contact Us . Terms of Use . Privacy

YubaNet.com © 1999-2014
Nevada City, California (530) 478-9600