Greetings sturgeon aficionados(as),

This real time update includes all detection data of green sturgeon from 1/1/2015 through noon 6/30/2015. New detections since the last update on 6/22/2015 are highlighted in yellow.

GS0764 which was detected at the I-80 station on 6/21/2015 was detected at the Above Tisdale station on 6/23/2015. This sturgeon was moving upstream at a speed of 51.9 river kilometers/day. This fish is another of the green sturgeon originally tagged on the Columbia River.

Another green sturgeon, GS0457, was detected at the Above Tisdale station on 6/26, then at the I-80 station on 6/27. This fish was moving downstream at a rate of 86.4 river kilometers/day. This fish was first detected entering the Sacramento River at the I-80 station on 2/22/2015. It looks to have spent nearly 4 months upriver, and now is out-migrating. Interestingly, it was missed at the Hood station, but was detected at the station inside the Delta Cross Channel on 6/28/2015. It is unclear weather or not this fish just went inside the DCC and then exited, or if it will be migrating out through the Mokelumne and San Joaquin River. There are only autonomous receivers below the Delta Cross Channel and on the Mokelumne system and Central Delta. We are gearing up to download those receivers this month. Once these are downloaded, we will know this fish's migration path.

There were no new green sturgeon detections on the Hood, Lisbon Weir, or Middle River real time stations.

There have been a total of 23 uniquely tagged green sturgeon detected in the Sacramento River since the real time stations have been operating in 2015. 7 of these sturgeon were originally tagged in Oregon/Washinton. 5 of these sturgeon were part of the the 2011 Tisdale/Freemont Weir rescue fish conducted by CDFW and UC Davis.

Of these 23 green sturgeon, only two have migrated down river, below the real time station at I-80 in Sacramento. One of these two have entered the DCC. The autonomous receivers will give the big picture of these fish's migration. We know that one of these fish has made it past Richmond Bridge as those receivers were downloaded over 4 weeks ago.

As always, the unique ID's presented in this update are not the specific tag ID of each fish. This is to protect the identy of those fish tagged by specific researchers.



Ryan Battleson
Staff Research Associate
UC Davis Biotelemetry Laboratory