DFC PRocEEDn.Gs . ALPT{ABsTICIL USTII€ oFABsTRAcTs

Authors: BYERS, S.’, WEnpON, S. |., WfffEnS, D. L. (Nc’drsbr€o6a,u.s.Fi.hurdwrldrrfcs6d.r,R@r.ivl

Year: 1995 (xxvii)

Abstract

Of the 34 native fish species of special concern in Nevad+ 15 occur in the unique habitsts of northern regions of the state. Induded are one sucker, two chub, six tui chub, I culthroat trout, two redband trout, bull trout’ relict- dace, and one speckled dace. Ten of these fishes are each restricted to only one valley. Unlike many of the species of special concern in southern Nevada, these fish species occur in non-thermal’waters. Little is known about the current status of these fishes. RJgSLftTElV De las 34 especies de peces nativos de inter6s especial en Nevada, 15 ocurren en hdbitats rinicos de las regiones nortefras del Estado. Se induyen: un sucker, dos chub, seis tiu chub, un cutthroat trout, dos redband trouts, bull trout, relict dace, y r:n speckled dace. Dez de 6stos peces estdn restringidos finicamente a wr valle. A diferencia de muchas de las especies de inter6s especial que ocurren en el sur de Nevada, dstas esPecies de Peces ocurren en a$las no termales. Poco se conoce acerca del estitus actual de 6stas especies. CanuIcrregl, G. I.’; IrNsEN, B. L.; W[uaiusoN, J. ff. tclc.sdtrrct.*Ehcd6rcdmro6,csrs-McNFH&rc U. S- Firh sd Wildtfc Sob, Mm, NM: BLj urd JHW - Sottwatsr Fgtrrro Tcdudory Cota . DqtE NFH&IC, U. S. Ftrh gd Wildlife Swb, Dc4 NM) Production and translocation of fishes: hazards and risks assessed and addressed? I(EYWORDS: Translocation;production;hazards;risks;hatcheries AtsSTRACT’Translocationn is yet another way to communicate the idea of moving fish from one place to another. Generally, translocation implies direct location to location transfer, although transfer ?rom location to hatchery to location is sornetimes induded. Hazards and risks, real and theorized, have been identified in production and translocation of fishes, especially when hatcheries and threatened or endangered fishes are involved Potential genetic hazards associated with traditional hatchery production methods include population extinction, loss of genetic variation within and among populations, and domestication selection. Identification of these potential hazards on hatcheries and their perceived risks has caused’concern within the conservation cornmunity. Consequently, hatchery propagation and reintroduction using hatchery fish has become less popular as a management tool for recoveqy purposes. Skepticism remains in spite of successful efforts to remove hazards and minimize risks through systematic implementation of modern fish culture practices. The response of some conservation rnanagers has been to discard hatcheries as a tool and focus on direct location to location transfers. Weak on supporting evolutionary theory and concepts, these“altemative” nunagement efforts may actually increase the risk of genetic hazar.l! to the target populations beyond that of more controlled management methods. On the other hand, fish spawned and reared under controlled conditions can provide, in some instances, product quality superior to that provided by alternative methodologies. New production methods are also being investigated to address concerns regarding environmental effects on fish physiolory and behavior. Examples will be presented to encourage a more systematic approach to hazard evaluation and risk reduction in management plans and activities. RES[,T1UEI\T“Traslocaci6n” es tambi6n otra manera de comunic:r la idea de mover un pez de trn lugar a otro. Generalmente, traslocaci6n implica moviemient de una locaci6n directa a otra, sin embargo transferir de 26