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Movement of Rainbow Trout in Arkansas Tailwaters

Movement of Rainbow Trout in Arkansas Tailwaters. Daniel D. Magoulick Arkansas Cooperative Fish and Wildlife Research Unit Department of Biological Sciences University of Arkansas - Fayetteville. Questions About C & R Areas. Do resident trout stay within the C & R areas?

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Movement of Rainbow Trout in Arkansas Tailwaters

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  1. Movement of Rainbow Trout in Arkansas Tailwaters Daniel D. Magoulick Arkansas Cooperative Fish and Wildlife Research Unit Department of Biological Sciences University of Arkansas - Fayetteville

  2. Questions About C & R Areas • Do resident trout stay within the C & R areas? • Do rainbow trout maintain home ranges? • How do movements compare to the CR lengths? Bull Shoals Dam & Tailwater http://www.arkansas.com/photo-gallery/default.asp#Bull Shoals Lake and the White River

  3. Stream Length (m) Bull Shoals = 1400 Norfork = 1600 Rim Shoals = 2600 Sylamore = 4200 Study Sites

  4. Methods Two Approaches I. Radiotelemetry II. Otolith Microchemistry http://www.marinebiodiversity.ca/otolith/english/daily.htm

  5. Part I: Radiotelemetry • Data Collection • GIS Analysis • SAS Analysis • SYSTAT Analysis PAIRED STUDY DESIGN 20 IN / 20 OUT in Fall 2005 *Boosted to 20 IN at Bull, Norfork & Rim in Spring 2006

  6. Radiotelemetry Design • Capture • Tag • Weekly Locations & Fates • Norfork Preliminary Study • Good Retention • Growth Rates/Condition from • Population Estimates

  7. Capture & Tagging • Capture • Sedate • Weight (450 g +) & Length • Picture & VI Tag

  8. Capture & Tagging 5. Incision 6. Antibiotic Injection (OTC) 7. Tag Insertion 8. Stitches & Ointment 9. Revive and Release Finished

  9. Tracking Summary • 230 Total Fish Tagged • 144 Tagged IN CR • 86 Tagged OUT CR • 124 (54%) Individuals Tagged had 15+ • 86/144 (60%) Tagged IN • 38/86 (44%)Tagged OUT • Average of 24 Relocations/Fish Used for Home Range Analysis *All further analysis includes only fish with 15+ locations

  10. SITE BULL NORFORK RIM SYLAMORE Locations: In vs. Out • 60/86 Tagged In Stayed In (70%) • 22/38 Tagged Out Stayed Out (58%) • 42/124 Moved In-between (34%) • Fish Tagged OUT at Rim Were Found IN on Average 26% of the Time • Fish Tagged IN at Sylamore Were Found OUT on Average 53% of the Time

  11. 9000 8000 10000 40000 9000 8000 7000 8000 7000 6000 30000 7000 6000 5000 6000 5000 MAX_RANGE 5000 4000 20000 4000 4000 3000 3000 3000 2000 10000 2000 2000 1000 1000 1000 0 0 0 0 IN OUT IN OUT IN OUT IN OUT TAGGED TAGGED TAGGED TAGGED BULL SYLAMORE NORFORK RIM Movement: Distance vs. CR • Overall: 24/124 (15%) Moved > Length of Respective CR Areas • Bull: 4/32 (13%) Moved >1700 m • Norfork: 9/31 (29%) Moved > 1800 m • Rim: 4/35 (11%) Moved ( > 2600 m • Sylamore: 7/26 (27%) Moved >4000 m *NOTE SCALE

  12. 95% of time spent between here

  13. SYSTAT: Within Site ANOVA’s Median and range (in parentheses)

  14. SYSTAT: AMONG Site ANOVA’s Median and range (in parentheses)

  15. Discussion • At most sites fish tagged OUT were found IN more than vice-versa • At Sylamore, fish movement between areas was common • Most fish are moving less than the lengths of their respective CR areas • Sylamore had the largest home range estimates • Warm water may force fish to move

  16. Conclusions Majority (70%) tagged in the CR have remained there • Only 15% of all tagged fish (IN or OUT) had linear distance > the length of their CR areas • CR areas appear to have no effect on distances moved Most of the fish tagged IN are being protected from angler mortality, increasing their residence time, allowing them to grow larger

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