9586

• UCREFRP Catalog Number: 9586
• Author: Desert Fishes Council.
• Title: Proceedings of the Desert Fishes Council Volume XXVI 1994 Annual Symposium.
• USFW Year: 1994.
• USFW - Doc Type: Furnace Creek, CA.
• Copyright Material: NO

DFC PROCEEDINGS - ABSTRACTS AND CONTRIBUTED PAPERS IN ORDER PRESENTED
to secure habitats for this threatened fish. A contract with the National Biological Survey will continue at this site
to gather habitat requirement information and assist in recovery of this species. Pahrump poolfish, Empetrichthys
latos latos- Census work was conducted on the three populations of Pahrump poolfish at Com Creek, Spring
Mountain Ranch State Park, and Shoshone Ponds Refuguim. Populations within the Las Vegas area were monitored
by John Pedretti through contract agreements. All populations are stable at 5,660, 15,040, and 2,900, respectively.
VIRGIN RIVER FISHES - In October of 1993, 1,500 woundfin, Plagopterus argentissimus, were received from
Dexter National Fish Hatchery and Technology Center. These fish were tagged and released into Nevada reaches
of the Virgin River. Along with small numbers of resident native fish, a high of 23 marked fish were captured by
a Bio/West crew in February. During woundfin surveys, small numbers of adult Virgin Fiver roundtail chubs, Gila
robusta seminuda, were found in the river below Mesquite, Nevada.
RAZORBACK SUCKER Xyrauchen texanus - Involvement with several recovery activities continue on Lake
Mead and Lake Mohave. On Lake Mead, in 1994, with the help of Bio/West personnel, sampling efforts were
expanded to all areas of the Overton Arm and Boulder Basin in hopes of finding additional aggregations of fish.
This was quite time consuming and produced no additional fish. Over the season only 4 fish were captured, all just
outside the Las Vegas Bay Marina. Most curious of these fish was a young 14 inch fish. Efforts over the last 4 years
on Lake Mead have resulted in 50 razorback suckers captured, tagged, and released.
BIG SPRINGS SPINEDACE Lepidomeda mollispinis pratensis - Good numbers of individuals were again found
throughout areas of desingated critical habitat. Forty young fish were taken to the University of Nevada, Las Vegas
under the direction of Fran Taylor for research on habitat preferences and behavior in hopes that information gained
can also be applied to the White River spinedance.
RAILROAD VALLEY SPRINGFISH Crenichthys nevadae - Catch per unit effort values for Railroad Valley
in 1994 were comparable to past years. Populations at all springs remained stable. Populations in the Duckwater
Valley; Big Warm Spring, and Little Warm Spring, continue to be depressed. The isolated introduced populations
at Sodaville and at Hot Creek Canyon remain at stable levels although they have shown slight impacts form recent
gavitat alterations and development.
RELICT DACE Relictus solitarius - With the addition of a summer survey crew working on this species, an
additional 5 sites of historic distribution have been documented, to bring the total to 24 sites. These are dace
populations that have not been surveyed since 1980. Ruby Valley, Butte Valley, Steptoe Valley, Goshute Valley,
and Spring Valley surveys have now been completed.
MUDDY (MOAPA) RIVER - Surveys again concentrated on distribution and abundance of the Moapa roundtail
chub, Gila robusta ssp. Chub and springfish populations seem to be very healthy. After a serious fire on the Moapa
Valley National Wildlife Refuge the Moapa dace, Moapa coriacea, appears to have maintained numbers in the
Warm Springs area.
VIRGIN RIVER SPINEDACE Lepidomeda mollispinis mollispinis - After completion of the 1994 survey it was
again substantiated that these fish are no longer found in Nevada waters. Surveys have been done consecutively
for the last 5 years without success. The NDOW is co-operating in development of a conservation agreement for
this subspecies and the native fish program is supporting the initial planning of experimental reintroductions in
historic habitats below Schroeder Reservoir.
TUI CHUB Gila bicolor - Collections of all tui chub populations within Nevada were made in 1994 and submitted
to Phil Harris at Oregon State University. Under the direction of Dr. Douglas Markle, (mt) DNA techniques will
be used to assess tui chub taxonomy in Nevada and describe genetic population structure.
CLAVES: dace; Nevada; Valle Pahca mpt; peces de pozas; maalote jorobado; charal aleta redondeada; speckled dace; s0nedaw; springfish;chmal ft i
RESUMEN
El Nevada Division of Wildlife ha comenzado a aumentar los programas de peces para ajustarse a la demanda
de necesidades a to largo del estado de Nevada. Durante el aiio fiscal 1994 un equipo de evaluaci6n estacional de
peces nativos se encontraba activo en la porcion Norte del estado y actualmente hay fondos disponibles para el
puesto de tiempo completo en la region nortefia. El programs de peces nativos continua monitoreando, evaluando
el estatus y coordinando el programs para todas las actividades u subespecies de peces enddmicas dentro de los
confines del Estado de Nevada. En la actualidad 57 se encuentran enlistados por el United States Fish and Wildlife
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