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PROCEEDINGS OF THE DESERT FISHES COUNCIL 1992 - VOLUME =V
<br />MEYER, L. L. * (LLM - Utah State University, Logan, UT)
<br />Reintroduction of bonytail chubs Gila elegans into the Green River, UT / Reintroduction
<br />de charalitos elegantes Gila elegans en el Rio Verde, Utah
<br />KEYWORDS: reintroduction; bonytail chub; Gila elegans; Dexter National Fish Hatchery; Green River; Utah; New
<br />Mexico
<br />ABSTRACT
<br />An experimental stocking study using adult hatchery-reared bonytail chubs Gila elegans was conducted in 1988 and
<br />1989. The goal of the study was to evaluate the feasibility of a major reintroduction program. Radio-telemetry was used
<br />to monitor habitat use, dispersal and survival of bonytail chubs released into the Green River, UT. One hundred fifty-two
<br />fish were transported from the Dexter National Fish Hatchery, Dexter, NM to the Green River near Vernal, UT.
<br />As a reintroduction effort, the study was unsuccessful because nearly all fish died within two weeks after release.
<br />We used various methods to try to increase survivability of fish in order to meet the original study objectives. The fate
<br />of those fish is described and recommendations for future reintroduction efforts using endangered fishes is discussed.
<br />RESUMEN
<br />Un estudio experimental de repoblamiento utilizando charalitos elegantes Gila elegans adultos de una granja
<br />reproductora-criadora fue conducido en 1988 y 1989. El objetivo del estudio fue evaluar la factibilidad de un importante
<br />programa de reintroduccion. Se utilizo radiotelemetria para monitorear use de habitat, dispersion y sobrevivencia de los
<br />charalitos elegantes liberados en el Rfo Verde, Utah. Fueron transportados 152 peces desde la Granja Reproductora
<br />National de Peces de Dexter, en Dexter Nuevo Mexico, al Rio Verde cerca de Vernal, Utah.
<br />Como resultado del esfuerzo de reintroduccion, el estudio fue insuficiente porque Iasi todos los peces murieron en
<br />las dos semanas siguientes a su liberation. Utilizamos varios metodos para tratar de incrementar la sobrevivencia de los
<br />peces de acuerdo a los objetivos originales del estudio. Se describe el destino de estos peces y se discuten las
<br />recomendaciones para esfuerzos futuros de reintroduccion utilizando peces en peligro.
<br />[HUBBS STUDENT PAPER COMPET[TORI
<br />TENIENTFrNIVON, E. (Laboratorio de Ecologia, Depto. de Zoologia, Escuela National de Ciencias Biologicas, I.P.N., Mexico, D.F.)
<br />Changes in the estuary of Ria Lagartos Yucatan, as a consecuence of hurricane Gilbert
<br />/
<br />Cambios en el estero de Ria Lagartos Yucatan, Como consecuencia del huracan Gilberto
<br />KEYWORDS: Estero; Estuary; Hurricane; Huracan; Inventario; Inventory; Reserva; Reserve
<br />ABSTRACT
<br />During the years 1989-1990 four survey trips were made in the Ria Lagartos to observe the effects of the pass of
<br />hurricane Gilbert. Fishes were collected during each trip and essential physicochemical parameters (oxygen, temperature,
<br />salinity, transparency) measured. Data from this survey are compared with those published by Zamacona in 1982.
<br />RESUMEN
<br />Durante 1989-1990 se realizaron cuatro campaiias de trabajo en el estero de Ria Lagartos, con el objeto de observar
<br />los efectos causados por el paso del Huracan Gilberto, por to que en cada una de ellas se efectuaron colectas de peces,
<br />adeinds de medir los parametros fisicoquimicos esenciales (oxigeno, temperatura, salinidad, transparencia), estos ultimos
<br />se comparan con los datos publicados por Zamacona (1982).
<br />WILIJAAE, C. M. (CMW - Dexter National Fish Hatchery & Technology Center, Dexter NM)
<br />Woundfin, Ich, and Temperature / Charalito, Ich, y temperatura
<br />KEYWORDS: woundfin; Plagopterus argentissimus; Cyprinidae; IchthyophthWus multifilis; Dexter NFH; Utah;
<br />Arizona; Nevada
<br />ABSTRACT
<br />The woundfin, Plagopterus argentissimus, is an endangered cyprinid from the Virgin River system in Utah,
<br />Arizona, and Nevada. It was first brought into captivity at Dexter National Fish Hatchery in 1979 to maintain a
<br />population for reintroduction purposes. Problems in culture have occurred, ranging from loss in ponds due to excess
<br />aquatic vegetation, Lernaea infestation, and most notably Ichthyophthhius multifilis, or "Ich." Earlier this year the FDA
<br />banned the use of some chemotherapeutants traditionally used for Ich. The captive woundfin population is especially
<br />prone to acute Ich outbreaks in the spring, so alternative methods of control were investigated. All methods are basically
<br />water treatments and act on the free-swimming stage of the parasite. Non-chemical treatments include water ozonation,
<br />radiation with UV light, sub-micron filtration, increasing flow, and temperature extremes. This paper will describe the
<br />methods and results from an experiment using temperature control, and discuss the disease and reproductive status of
<br />woundfin currently at the station.
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