2007-157-00 Cyndi Baker & Jen Graham. Began in 1998 to document bull trout life history in WSR and SC and monitor population abundance Data from 1998.

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Presentation transcript:

Cyndi Baker & Jen Graham

Began in 1998 to document bull trout life history in WSR and SC and monitor population abundance Data from 1998 to 2009 summarized in a 2011 report Study objectives were reviewed, adjusted and/or added in 2011 categorical review project proposal

Distribution across Warm Springs Reservation Relative abundance of juvenile bull trout/brook trout in index reaches in WSR and SC Spawning distribution and redd counts in index reaches in WSR and SC Migration timing and patterns Document fluvial and resident forms Hybridization with brook trout

1999 to 2011

Resident vs. fluvial that migrate to Deschutes R. Emmigration/immigration timing Outmigrant traps at mouth of WSR and SC Weirs for returning adults at mouth of WSR and SC Radio Telemetry

implanted with radio tags and released (same vicinity where caught): DR (n=9) hatchery (n=9) SC at weir (n=5) caught below Round Butte Dam, implanted with radio tags and released in lower Deschutes R.; 2 caught in CR: One downstream of John Day Dam One at Lone Pine, downstream of Deschutes R. mouth

Tissue samples collected 1999 and 2005 WSR (n = 15 in 1999; 39 in 2005) SC (n = 30 in 1999; 40 in 2005) Univ. Montana (Dr. Spruell) used paired interspesed nuclear element (PINE-PCR) method to amplify markers that differentiate bull – brook trout and allow identification of hybrids Results - one F1 hybrid identified in SC

Update bull trout distribution map (last done 1998) Continue monitoring trends in index reaches in WSR and SC and water temperatures relative abundance of bull/brook trout (add WW) redd counts (plus Whitewater R. and Jefferson Ck) Permutation analysis determine the probability of detecting a population decline using snorkel counts in index reaches in WSR and SC Migration patterns to describe life-history patterns Continue operating weirs Add HDX antennae arrays Develop bull trout length and age relationships specific to WSR and SC Develop plan for re-establishment of bull trout in Mill Creek

Trends in relative abundance of juveniles and redd counts provide indication of population status over time Continue monitoring juvenile abundance and redds in WSR & SC for long-term trends Continue monitoring redds in Jefferson Ck. and Whitewater R. in Metolius Basin Begin monitoring juvenile abundance in Whitewater R. Bull trout distribution Update distribution map (habitat surveyors reported additional sites) Develop plan to re-establish bull trout distribution in Mill Creek Permutation test will validate whether indices in juvenile abundance have the power to detect 25%, 50% and 75% decline in population over 5, 15, and 30-yr period ( using methods of Budy et al )

Further documentation of bull trout movement patterns within WSR & SC to define home range of resident forms and migration timing of fluvial forms into spawning grounds Continue operating outmigrant traps and weirs Install HDX antennae in WSR & SC, PIT tag 50 bull trout/year – year-round monitoring Bull trout released from SWW into lower Deschutes R. HDX tagged Bull trout length and age relationships specific to WSR and SC and by life-history type Collect scale samples from fish while PIT tagging and catch at weirs (age structure of population) Validate length at age of first spawning (could expand or contract assumed spawning population)

Bull trout are listed under the ESA – Monitoring is important to gage recovery (Draft Bull Trout Recovery Plan) and identify management actions CTWSRO is a sovereign nation with sole management authority on the Reservation - Monitoring data used to take management actions as identified and recovery planning Habitat restoration in Mill Creek and re-establishment of bull trout LWD placement in WSR Fish passage barriers (e.g. WSNFH) Management of fish passage through SWW and LBC fishery LBC management of prey base (kokanee) Release of kokanee downstream of Pelton for sockeye re-establishement Manage bull trout fishery in LBC (are Whitewater bull trout part of this fishery?) Fish passage through SWW and transported downstream of Pelton Releasing bull trout downstream of Pelton may reduce genetically unique populations (e.g., Whitewater) Fish passage upstream If bull trout are not passed upstream then there could be potential for competition and introgression in SC and WSR Advancing understanding of life histories of bull trout in Deschutes Basin will aid interpretation of data Age at length by life history types First age at spawning/frequency of spawning Genetic structure of fluvial components with respect to resident populations Contribution of fluvial/resident to spawning population Whitewater bull trout (adfluvial/resident/fluvial?), whats the risk of entering the SWW and getting sent downstream?