Reviews in Fish Biology and Fisheries

, Volume 11, Issue 4, pp 301–319

Salmonid inbreeding: a review


DOI: 10.1023/A:1021330500365

Cite this article as:
Wang, S., Hard, J.J. & Utter, F. Reviews in Fish Biology and Fisheries (2002) 11: 301. doi:10.1023/A:1021330500365


We review the published literature oninbreeding and its consequences in salmonidfishes. Inbreeding reduces genetic variationwithin populations by decreasingheterozygosity, either through an increasedchance of sharing parental genes or a loss ofalleles from random genetic drift. Increasedinbreeding is often associated with a reductionin mean phenotypic value of one or more traitswith respect to fitness (inbreedingdepression). We identify several sources ofinbreeding in salmonids. Although inbreedingoccurs naturally, much of the evidence forinbreeding stems from direct or indirectresults of human activity. The potentialconsequences of inbreeding highlight theimportance of maintaining genetic diversity insalmonid populations. Our weak understandingof genetic interactions between cultured andwild salmonids has allowed widespread practicesthat can reduce genetic variability in naturalpopulations. Although studies have detectedinbreeding depression in salmonids, its geneticbasis has rarely been addressed in wild,anadromous salmon. The genetic basis ofinbreeding depression is complex, andevaluating its effects over the entire lifecycle remains challenging. The experimentalevidence nevertheless reinforces the importanceof maintaining genetic variation withinpopulations as a primary goal of conservationand management.

inbreeding depressioninbreedinggenetic variationsalmon culturesalmonids

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  1. 1.School of Aquatic and Fishery SciencesUniversity of WashingtonSeattleUSA
  2. 2.Conservation Biology DivisionNorthwest Fisheries Science Center, National Marine Fisheries ServiceSeattleUSA