Vertical movement patterns and habitat use of burbot in Tanada and Copper Lakes, Alaska

Project Description

Burbot abundance is typically estimated using mark-recapture experiments, a design which prohibits using traps deeper than >= 15 m to protect fish from decompression trauma. However, this approach assumes that a representative sample of the population is collected and that complete vertical mixing occurs between sampling events. For all burbot lakes studied within the Copper River drainage of Alaska, these assumptions have never been fully evaluated because the behavior and vertical movements of burbot have never been fully assessed. This project proposes to: (1) determine if burbot in Tanada and Copper lakes express differences in thermal and depth habitat preferences; and (2) use recorded movements of burbot surgically implanted with archival data loggers (time-depth-temperature) to evaluate the sampling design for a two-sample mark-recapture experiment due to burbot behavior relative to depth. Preliminary findings from tags recovered in summer 2010 at Tanada Lake indicate that there is a percentage of fish that are not within the study area during optimal sampling dates (September before ice up). This may indicate that current management strategies are missing a portion of the burbot population within this lake. With many Alaskan lakes, and especially Tanada and Copper lakes, the bathymetry (depths > 15 m) can preclude large sections of the lake from being sampled and, in these cases, the experiment relies heavily on mixing between events to attain a representative sample in the second event. In either lake, there exists the possibility of fish permanently residing at depths > 15 m, which would lead to any abundance estimates being biased. Recent developments of smaller high-capacity archival data loggers that record depth and temperature have permitted refined investigations of vertical movements and thermal-use patterns.

Research Team

Principal Investigator

picture of Trent Sutton

Trent Sutton

Associate Dean of Academics
Professor
Specialties:
  • Recruitment dynamics of fishes
  • Fish habitat assessment
  • Population biology and ecology of fishes
  • Trophic ecology and food-web dynamics
tmsutton@alaska.edu
(907) 474-7285
Full Profile

Co-Principal Investigator

Klaus Wuttig, Alaska Department of Fish and Game, Division of Sport Fish

Research Staff

Heather Scannell, Master's Degree Graduate Student, University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fisheries Division

Project Funding

National Park Service
Amount: $39,150
Start Date: 2009-01-00 End Date: 2015-12-00

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