White Catfish and Adult Striped Bass Diets in Suisun Marsh
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1 White Catfish and Adult Striped Bass Diets in Suisun Marsh Teejay O Rear (taorear@ucdavis.edu) and Peter Moyle (pbmoyle@ucdavis.edu) UC Davis Center for Watershed Sciences and Wildlife, Fish, and Conservation Biology Cal-Neva AFS 2015 Santa Cruz, CA North Delta Arc working group: Matt Young, Denise DeCarion, Thomas Handley, Amber Manfree, Brian Williamson, Jacob Montgomery, Kathleen Berridge, Kousei Martin Perales, Felipe La Luz, Chris Jasper, Teejay O Rear, Randy Dahlgren, William Fleenor, James Hobbs, John Durand, Peter Moyle
2 White Catfish and Adult Striped Bass Diets in Suisun Marsh 1. Key Suisun Marsh features 2. White catfish diets 3. Adult striped bass diets
3 Managed Wetlands Water Management wet wet Suisun Marsh dry Win Spr Sum Aut Oxygen:Variable Year: 2009 a, b Water Clarity: Low
4 Suisun Marsh Why Do We Care? Waterfowl! Sacramento Splittail Otter Trawl Rank: #2 (28,348 fish) of 54 spp. Beach Seine Rank: #6 (3,821 fish) of 38 spp. a a, c, d
5 Otter Trawl Rank: from #14 ( ) to #5 ( ) of 54 spp. White Catfish a Adult Striped Bass a
6 White Catfish Delta (Turner 1966) They included Dorosoma petenense, Alosa sapidissima, Roccus saxatilis, Hypomesus olidus, Lampetra ayresi, Clupea pallasi, and Lepomis macrochirus. e Striped Bass Delta (Nobriga and Feyrer 2007) f
7 White Catfish Diets in Suisun Marsh? Unknown Questions: What are white catfish eating? Associated with habitat features? Any habitat features explain piscivory of white catfish? Methods: Stomach-pump (deck hose!) white catfish from Suisun Marsh Fish Study trawls Sampling period: June 2009 May 2010 Correlate habitat variables to diet items (sal, temp, clarity, depth, DO, diversion density) Test habitat variables on piscivory
8 White Catfish Diets in Suisun Marsh 56 n = 304 fish winter: 28 spring: 135 summer: 102 autumn: fish (90%) w/food mean SL: 216 mm (adults); few<182 mm
9 White Catfish Diets in Suisun Marsh (no smelt/salmon) Very Tiny Things Daphnia magna CA bay shrimp Very Tiny Things Daphnia magna overbite clam Eogammarus confervicolus Bio Photo Group, ON shim. goby Bio Photo Group, ON Eogammarus confervicolus stickleback wetland species bay/slough species g
10 %Fish Mass in Diet of White Catfish: Correlates? Parameter Parameter Estimate t-ratio Probability > t Temperature DO * Standard length Temperature X DO Temperature X standard Length DO X standard length Temperature X DO x standard length Managed Wetlands Water Management circulate water DO = 2.9 mg/l circulate water dry g
11 Adult Striped Bass Sample period: October 09 ongoing (opportunistic!) hook-and-line stomach pumped n = 373 fish winter: 122 spring: 139 summer: 24 autumn: fish (84%) w/food mean TL: 55 cm (22 in); range: cm 5 feeding areas: seams (13 fish) drains (228) pumps (52) rock (18) tidal creeks (40) PRELIMINARY!
12 Adult Striped Bass Diets: Fish Prey Numbers (?) (no smelt/salmon) Method Silversides Shads Sticklebacks Sculpins Fish/Trawl Fish/Seine Fish/Pumped Striped Bass
13 Adult Striped Bass Diets: Feeding Area
14 Adult Striped Bass Diets: Frequency of Occurrence
15 Conclusions Adult striped bass: fish diet dominated by slow-moving benthic/littoral fishes turbidity? Both species: no salmon/smelt eaten/identified Both species: most food from wetlands trophic relay?
16 Thanks! Mike Wigginton, Phil Antipa, everyone at the Suisun Marsh Branch of DWR, the Suisun Resource Conservation District, Melissa Riley (CDFW), the entire North Delta Arc Working Group (especially Brian Williamson), Alison Furler (CDFW), Tommy Agosta (UCD), Rachel Johnson (NMFS), Fred Feyrer (USGS), Alpa Wintzer, Rob Schroeter, Jason Moore (DWR), Patrick Fuller, Amy Chandos, Nick Buckmaster (CDFW), Miranda Bell (UCD), Nicky Bunn, Angie Munguia (DWR formerly!), Eva Bush (UCD), Nick Corline ( Mudbug ; UCD), Carson Jeffres (UCD), Emma Davidson (UCD), Josh Porter (EB Parks), Lily Tomkovic (UCD), Scott McDonald (CSUSJ), Hailey Pexton (UCD), Paul Takemoto (UCD), Robert Dunn (UCD), Joe Rogers, Georgia Ramos (UCD), Karin Petrites (Putah Creek Council), Emma Cox, Thaddeus Hunt, Quoc Van, Ethan and Janet Kean... Funding provided by California Department of Water Resources and private donors
17 References a. O Rear, unpublished data b. Siegel, S., P. Bachand, D. Gillenwater, S. Chappel, B. Wickland, O. Rocha, M. Stephenson, W. Heim, C. Enright, P. Moyle, P. Crain, B. Downing, and B. Bergamaschi Final evaluation memorandum, strategies for reducing low dissolved oxygen and methylmercury events in northern Suisun Marsh. Prepared for the State Water Resources Control Board, Sacramento, California. SWRCB Project Number c. California Department of Fish and Game. 1996, 1997, Fishery monitoring program a component of the Suisun Marsh Diversion Screening Program. University of California, Davis, California. d. Pickard, A. A. Baracco, and R. Kano Occurrence, abundance, and size of fish at the Roaring River Slough intake, Suisun Marsh, California during the and the diversion seasons. Technical Report 3, California, California Department of Fish and Game. e. Turner, J. L Distribution and food habits of ictalurid fishes in the Sacramento-San Joaquin Delta. Pages in J. L. Turner and D. W. Kelley, editors. Ecological Studies of the Sacramento-San Joaquin Delta, part 2. California Department of Fish and Game Fish Bulletin 136. f. Nobriga, M. L., and F. V. Feyrer Diet composition in San Francisco Estuary striped bass: does trophic adaptability have its limits? Environmental Biology of Fishes 83: g. O'Rear, T. A Diet of an introduced estuarine population of white catfish in California. Master's thesis. University of California, Davis.
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