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ABSTRACTS OF PRESENTATIONS IN ORDER PRESENTED
<br />maturation in May, he also suggested that under favorable conditions woundfin could spawn over a longer period
<br />of time. Perhaps favorable conditions include a delayed summer, as was simulated by these experiments.
<br />I found that upon heating more tapeworms evacuated their hosts. Over the 3 week course of the experiment,
<br />I collected 13 independent adult tapeworms. Given that the tapeworm is exotic to the Virgin River system, and has
<br />probably been in Utah only since 1984 (Heckmann et al., 1986), it may not be well adapted to the temperature
<br />extremes common there and imitated in this experiment. Temperature extremes should be investigated as a non-
<br />chemical parasiticide for tapeworms.
<br />I also observed woundfm mouthing, picking at, and ingesting such free-living tapeworms. In the Virgin River
<br />system, tapeworms are newcomers to the community, and woundfin feeding behavior probably does not include
<br />discrimination of tapeworms from other worths. This may not be the typical mode of tapeworm transmission to a
<br />host, but it may be the case for native fish in the Virgin River.
<br />Currently on hand at DNFH&TC, we have on hand 77 adults, 82 juveniles, and 173 y-o-y. The '91 and '92
<br />year classes are being maintained overwinter in 4, = 75 gallon fiberglass aquaria, and the adults are overwintering
<br />in an outdoor raceway. Fifty one mixed-age fish were sent to Dr. Steven Vives of Georgia Southern University on
<br />Oct 7. There he will conduct experiments on spawning and reproductive behavior.
<br />In order to maintain viable numbers of the captive population, and eventually produce enough fish to begin
<br />a restocking program for woundfin, it is necessary to maintain the highest standards of water quality, be ever
<br />vigilant for changes in fish behavior, and continue development of alternative treatment methods.
<br />* Use of trade '• does oot imply U. S. Govemmant endon¢ment of commercial products.
<br />Literature Cited
<br />Amlacher, E. 1970. Textbook of Fish Diseases, TFH Publications, Inc., Neptune City, New Jersey.
<br />Cross, D.G. 1972. A review of methods to control Ichthyophthiriasis. Progressive Fish Culturist 34(3): 165-170.
<br />Cross, J. N. 1978. Contributions to the biology of the woundfin, Plagopterus argentissimus (Pisces: Cyprinidae),
<br />an endangered species. Great Basin Naturalist 38 (4): 463-468.
<br />Deacon, J.E.,-P.B. Schumann and E.L. Stuenkel. 1987. Thermal tolerances and preferences of fishes of the Virgin
<br />River system (Utah, Arizona, Nevada). Great Basin Naturalist 47(4):538-546.
<br />Deacon, J. E. 1988. The Endangered Woundfm and Water Management in the Virgin River, Utah, Arizona,
<br />Nevada. Fisheries 13 (1):18-24.
<br />Ewing, M. S., S. A. Ewing, and K. M. Kocan. 1988. Ichthyophthirius (Ciliophora): Population Studies Suggest
<br />Reproduction in Host Epithelium. Journal of Protozoology 35(4): 549-552.
<br />Heckmann, R. A., J. E. Deacon, and P. D. Greger. 1986. Parasites of the woundfm minnow, Plagopterus
<br />argentissimus, and other endemic fishes from the Virgin River, Utah. Great Basin Naturalist 46 (4):662-676.
<br />Johnson, S. K. 1976. Laboratory evaluation of several chemicals as preventatives of Ich disease. U. S. Fish and
<br />Wildlife Service. Fisheries Disease Leaflet 10.
<br />Lockhart, J. N. 1980. Ecology of the Woundfm Minnow, Plagopterus argentissimus, Cope. Manuscript, Univ.
<br />Nevada, Las Vegas. 187 pp.
<br />Meyer, F. P. and G. L. Bullock. 1990. Protozoan parasites of freshwater fishes. Fish Health Bulletin 8. Dept. of
<br />the Interior, U. S. Fish and Wildlife Service.
<br />Meyer, F. P. 1984. Parasites of freshwater fishes; II, Protozoa Ichthyophthirius multifflis. U.S. Department of the
<br />Interior, Fisheries Disease Leaflet 2.
<br />Miller, R. R. and C. L. Hubbs. 1960. The spiny-rayed cyprinid fishes (Plagopterini) of the Colorado River System.
<br />Misc. Publ. Mus. Zool., Univ. Mich. 115: 1-39, 3 pls.
<br />Minckley, W. L. 1973. Fishes of Arizona. Arizona Game and Fish Department, Tucson, Arizona.
<br />Post, G. 1987. Textbook of Fish Health, TFH Publications, Inc., Neptune City, New Jersey.
<br />U. S. Fish and Wildlife Service. 1984. Recovery Plan for Woundfm, Plagopterus argentissimus Cope. U. S. Fish
<br />and Wildlife Service, Albuquerque, New Mexico.
<br />van Duijn, C. 1967. Diseases of Fishes, Charles C. Thomas, Publisher, Springfield, Illinois.
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