Be the first to like this
Summary of 2013 juvenile salmonid acoustic telemetry behavior study at the Bureau of Reclamation Tracy Fish Collection Facility
Cathy Karp, Brandon Wu
Bureau of Reclamation Denver Technical Services Center
In spring 2013, we released acoustically tagged juvenile Chinook salmon (n=69, 136.2 mm mean fork length, late‐fall run Coleman ational Fish Hatchery), juvenile steelhead (n=64, 198.7 mm mean fork length, Mokelumne River Fish Hatchery), and adult striped bass (n=36, 510 mm mean fork length, collected by angling and predator removals) at the Bureau of Reclamation’s Tracy Fish Collection Facility, Tracy, CA, to begin to quantify fish losses to predation and facility structure (louver/bypasses). A system of 21 acoustic telemetry hydrophones were set up upstream, within, and
downstream of the fish facility. Fish were released over a 3 day experimental period in March and May. Flow conditions ranged from 0.6 to 2.9 fps in the primary channel and 2.5 to 2.8 fps in the secondary channel (flows were highest on day 1, intermediate on
day 2 and lowest on day 3), beginning at 7am each day for 24 h. Fish releases were conducted during both day and night conditions (8am, 11am, 2pm, 8pm, 11pm, 2am for salmonids; 8am, 4pm, 12am for striped bass) during each 24 h flow condition. A total of 37 tagged salmonids (28 Chinook salmon, 9 steelhead) were recovered in the holding tanks and exhibited a wide range of behavior. Twenty‐nine fish were lost to predation and louvers (24 Chinook salmon, 5 steelhead). Acoustic telemetry data for the remaining fish are still being analyzed for the time following each 24 study period and include fate categories of swim‐out and non‐participation. The striped bass released into the facility remained while those released in front of the trash rack mostly left (1 as far as Red Bluff on the upper Sacramento River).