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Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 7, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

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Tuesday, January 29 • 11:40am - 12:00pm
(SYMPOSIA-09) The Use of Carbon Dioxide to Remove Resident Piscivorous Striped Bass (Morone saxatilis) from the Tracy Fish Collection Facility in the Sacramento-San Joaquin River Delta, California

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AUTHORS: Brandon J. Wu, Rene C. Reyes, Christopher L. Hart – U.S. Bureau of Reclamation; Kevin K. Kumagai, HTI-VEMCO USA, Inc.; Scott A. Porter, Michael R. Trask – U.S. Bureau of Reclamation

ABSTRACT: As an integral part of the Central Valley Project, the U.S. Department of the Interior, Bureau of Reclamation (Reclamation), Tracy Fish Collection Facility (TFCF; Byron, California) functions to salvage fish from Sacramento-San Joaquin River Delta water exported south by the C.W. “Bill” Jones Pumping Plant.  Predation by resident piscivorous fish is a contributing factor to fish loss at the TFCF and Striped Bass (Morone saxatilis) are generally considered the most prevalent piscivorous fish species within the facility.  To improve fish salvage and meet requirements mandated by the most recent National Marine Fisheries Service Biological Opinion, Reclamation is investigating the use of carbon dioxide (CO<sub>2</sub>) as an anesthetic to remove predatory fish from the TFCF system.  The treatment of various water conveyance channels and components of the TFCF with CO<sub>2</sub> has demonstrated that elevated CO<sub>2 </sub>concentrations (50–350 mg/L) increase the number and size of Striped Bass in collection tanks (salvaged), suggesting that this application is feasible and effective.  In addition, acoustically tagged Striped Bass appeared to exhibit an avoidance response to elevated CO<sub>2</sub> concentrations.  The removal of acoustically tagged and wild Striped Bass during CO<sub>2</sub> treatment allowed for calculation of removal efficiency as well as estimation of Striped Bass population within the TFCF system at the time of testing.  Efforts are currently underway to estimate optimal CO<sub>2</sub> concentration for removal of Striped Bass based on removal efficiency and 96-hour post treatment survival.  Preliminary results suggest that the optimal CO<sub>2</sub> concentration for Striped Bass removal is approximately 165 mg/L.  Future efforts will focus on increasing removal efficiency in TFCF collection tanks as well as developing methods to direct piscivorous fish out of the facility to a location where there is no impact on salvageable fish.

Tuesday January 29, 2019 11:40am - 12:00pm