Presentation is loading. Please wait.

Presentation is loading. Please wait.

Determining lamprey species composition, larval distribution and adult abundance in the Deschutes River sub-basin Jennifer Graham & Chris Brun Confederated.

Similar presentations


Presentation on theme: "Determining lamprey species composition, larval distribution and adult abundance in the Deschutes River sub-basin Jennifer Graham & Chris Brun Confederated."— Presentation transcript:

1 Determining lamprey species composition, larval distribution and adult abundance in the Deschutes River sub-basin Jennifer Graham & Chris Brun Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources

2 Project Area Oregon Confederated Tribes of Warm Springs Reservation

3 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objectives Objective 1: Determine larval distribution and associated habitat Objective 3: Estimate the number of lamprey outmigrants by developmental stage Objective 4: Estimate the escapement of adult lamprey, determine harvest and harvest rates at Sherars Falls. Objective 2: Determining species composition of Lampetra

4 Larval Distribution and Associated Habitat

5 ~ May - August Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 1 Methods ~ Three-tiered sampling methodology ~ Randomly selected 1 sample site per 10 Rkm

6 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 1 Methods – Habitat & Water Quality Tier 2 – Transect Wetted Channel Width Bankfull Channel Width Canopy Density Tier 1 – Reach Conductivity Dissolved Oxygen Water Temperature Channel Slope 60-m Tier 3 – Sub-sample Mean Water Depth Water Velocity Substrate Composition Habitat Type 1m x 1m

7 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 1 Methods – Lamprey sampling ~ Backpack electrofisher (AbP-2) ~ 2, 90-s samples ~ Lamprey ~ Anesthetized, identified, weighed and measured ~ Returned to collection area Tier 3 – Sub-sample

8 ~ 132 sub-sampled ~ 29.5% contained ammocoetes Results - Streams ~4 of 13 streams sampled contained ammocoetes ~ Present in lowest reaches

9 ~ 131 ammocoetes collected ~ Total length range: 25 mm – 145 mm ~ Mean total Length: 77 mm Results – Lamprey Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 1

10 However, sample sizes were small!! Regression P-Value Lamprey presence vs. Woody debris0.000 Lamprey presence vs. Depositional Area0.011

11 2004 Summary ~ Continue larval distribution and habitat data collection ~ Remainder of perennial streams in the lower Deschutes ~ Mainstem Deschutes ~ Conducted sampling in three tributaries ~ Determined distribution

12 Species Composition

13 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 2 Methods & Results ~ Field identification problematic ~ Collect samples for permanent collection ~ Electrofishing ~ Rotary screw trap ~ Collect specimen in three different phases of development ~ Only observed species in two phases

14 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective Summary ~ Continue collecting samples ~ Send problematic samples to USGS

15 Estimate outmigrants and outmigration timing

16 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3 Methods ~ Fished 2 screw traps ~ 5 days/wk; 24 hrs/day ~ Collected lamprey ~ Anesthetized ~ Identified to species ~ Developmental stage ~ Length

17 Screw Trap Summary Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3 Days Operated Days with lampreys present Ammocoetes Collected Ammocoete Length Range (mm) Ammocoetes Mean Length (mm) Macropthalmia Collected68 1 Macrophtalmia Length Range (mm) Macropthalmia Mean Length (mm) Warm Springs River Shitike Creek

18 Results – Warm Springs Timing Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3

19 Results – Warm Springs Timing Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3

20 Results – Shitike Creek Timing Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3

21 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3 Trap efficiencies ~ Multiple trap holding efficiencies ~ 0% holding efficiency ~ No out-migrant estimates completed ~ Ammocoetes captured through electrofishing ~ Marked with elastomer ~ Placed in holding box ~ Checked after 24 hours

22 2004 Summary ~ Modify existing traps ~ Continue collecting timing data ~ Mark-recapture to estimate out-migrant numbers ~ Conduct trap efficiencies

23 Escapement Estimate and Tribal Harvest Picture courtesy of Lyman Jim

24 Sherars Falls

25 Methods – Escapement Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 4 Lamprey pots (USFWS) ~ Late-June – early-July ~ Multiple modifications ~ Fished various locations in fish ladder Long-handled dip net ~ Late-June – August ~ Fished each pool 1 time/hr ~ Same location each time

26 Floy Tag Fin Clip 199 Lamprey Tagged Results - Tagging

27 Results – Recapture Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 4 Primary Tag Retention 77% 35 Recaptures (17.6% recapture rate) 11 Netting; 22 Creel; 2 Tribal member returns

28 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 4 Methods – Tribal Harvest ~ Access site creel survey ~ Mid-June - August ~ 4 weekdays; 1 weekend day ~ 1 hr. after sunset – 3 am ~ Creeled lamprey ~ Examined for fin clip and floy tag ~ Total length measured ~ Creel data expanded to estimate total tribal harvest

29 Results – Tribal Harvest ~ 21 interviews conducted ~ 585 lamprey collected ~ 960 estimated harvest ~ 9.25 lamprey/hr ~ Mean length: 62 cm ~ Range: cm Roger Jim, Sr. Celilo Falls

30 ~ Tribal Harvest ~ Creel surveys ~ Mark-Recapture Study ~ Estimate escapement ~ Tag retention ~ Average movement rate 2004 Summary

31 Conclusions Objective 1 Larval lamprey & Habitat ~Lamprey were present in 4 of the 13 streams sampled ~Complex habitat needs including depositional areas and woody debris ~Small sample sizes made it difficult to find relationships with lamprey presence Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources

32 Conclusions Objective 2 Species Identification ~Permanent collection ~Collected through electrofishing and rotary screw trap operations ~Only observed/collected 2 or the 3 developmental stages Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources

33 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Objective 3 Timing Shitike ~ Peak movement: 2002 – March 2003 – December WSR Ammocoetes Macropthalmia ~ Peak movement:2002 March March 2003 May December Conclusions

34 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Conclusions Objective 4 Tribal Harvest & Upstream migration Adult Escapement Estimate ~ Marked 199 adult lamprey ~ Recaptured 35 ~ Tag retention 77% Tribal Harvest ~ 21 creel interview conducted – 585 lamprey ~ Estimated harvest 960

35 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources 2004 Summary ~ Objective 1: ~ Larval lamprey collection ~ Habitat Conclusions ~ Objective 2: ~ Species identification

36 Confederated Tribes of Warm Springs Reservation, Oregon Department of Natural Resources Conclusions 2004 Summary ~ Objective 3: ~ Collect timing data ~ Conduct trap efficiencies ~ Objective 4: ~ Estimate escapement ~ Monitor tribal Harvest

37 We would like to thank Bonneville Power Administration for funding this project.


Download ppt "Determining lamprey species composition, larval distribution and adult abundance in the Deschutes River sub-basin Jennifer Graham & Chris Brun Confederated."

Similar presentations


Ads by Google