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<br />TYUS, BURDICK, AND MCADA
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<br />COll RADIO
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<br />Figure 4. Water depth (m) and velocities (m/
<br />second x 10-1) recorded for collected (COLL)
<br />and radiotelemetered (RADIO) Colorado
<br />squawfish in three rivers.
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<br />Although the analysis of variance indicted no
<br />significant differences (P = 0.01) between veloc-
<br />ity readings for Colorado squawfish using both
<br />methods in the Green River in 1980 and 1981,
<br />velocity measurements by both methods were
<br />different (P = 0.01) between the Green, White
<br />and Yampa rivers. The close agreement obtained
<br />from these analyses indicated that, for general
<br />habitat information, radiotelemetry data were at
<br />least as good for obtaining differences in selected
<br />flow regimens as data taken from captured fish
<br />locations.
<br />Habitat preference data obtained by fish ra-
<br />diotelemetry appears to be more accurate than
<br />that obtained from conventional fish collections
<br />because gear selectivity and lack of efficiency can
<br />be avoided. In addition, diel and seasonal habitat
<br />preferences can be obtained for the same fish. In
<br />large turbid river systems where conventional
<br />fish collecting techniques cannot effectively sam-
<br />ple all habitats (and fish cannot be visually ob-
<br />served), radiotelemetry may be the only tool
<br />available to obtain such information. For a rare
<br />fish like the Colorado squawfish, conventional
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<br />fish collecting may not provide a large enough
<br />sample to adequately assess their habitat require-
<br />ments. Fish managers who develop a working
<br />knowledge of radiotelemetry will be more effec-
<br />tive in determining habitat requirements, iden-
<br />tifying fish management problems relating to
<br />habitat changes, and recommending solutions for
<br />them.
<br />
<br />ACKNOWLEDGMENTS
<br />
<br />This study was funded partly by the Bureau of
<br />Reclamation, Bureau of Land Management, Na-
<br />tional Park Service, and Fish and Wildlife Ser-
<br />vice. Fish and Wildlife Service employees who
<br />aided with field sampling included K. C. Harper,
<br />R. M. McNatt, D. L. Skates, and E. J. Wick. The
<br />states of Colorado and Utah provided logistical
<br />support.
<br />
<br />REFERENCES
<br />
<br />BIDGOOD, R F. 1980. Fish surgical procedure for
<br />implantation of radio tags in fish. Fisheries Re-
<br />search Report 20, Alberta Division of Fish and
<br />Game, Edmonton, Alberta, Canada.
<br />CHAMBERlAIN, A. 1979. Effects of tagging on equi-
<br />librium and feeding. Underwater Telemetry
<br />Newsletter 9(1)1-3, Oak Ridge, Tennessee, USA.
<br />HYNES, H. R N. 1970. The ecology of running waters.
<br />University of Toronto Press, Toronto, Canada.
<br />MILLER, W. H., D. L. ARCHER, H. M. Tyus, AND K.
<br />C. HARPER. 1982. White River fishes study. Fi-
<br />nal report. U.S. Fish and Wildlife Service, Salt
<br />Lake City, Utah, USA.
<br />MILLER, W. H., D. L. ARCHER, H. M. Tyus, AND R.
<br />M. McNAlT. 1982. Yampa River fishes study.
<br />Final report. U.S. Fish and Wildlife Service, Salt
<br />Lake City, Utah, USA.
<br />Ross, M. J., AND J. H. McCoRMICK. 1981. Effects of
<br />external radio transmitters on fish. The Progres-
<br />sive Fish Culturist 43:67-73.
<br />STASKO, A. R, AND D. G. PINCOCK. 1977. Review of
<br />underwater biotelemetry, with emphasis on ultra-
<br />sonic techniques. Journal of the Fisheries Re-
<br />search Board of Canada 34:1261-1285.
<br />Tyus, H. M., C. W. McADA, AND B. D. BURDICK.
<br />1982. Green River fishery investigations: 1979-
<br />1981. Pages 1-99 in: Final report of the U.S. Fish
<br />and Wildlife Service and U.S. Bureau of Recla-
<br />mation, Part 2. Colorado River Fishery Project,
<br />Salt Lake City, Utah, USA.
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