Morphometric variation of wild trout populations from northwestern Mexico (Pisces: Salmonidae)

Gorgonio Ruiz-Campos*, Faustino Camarena-Rosales, Alejandro Varela-Romero, Sergio Sánchez-Gonzáles, Jorge De La Rosa-Vélez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Morphometric variation of 17 wild trout populations of the genus Oncorhynchus from northwestern Mexico was analyzed. We used 25 standardized morphometric characters following a box truss protocol. In the discriminant function analysis (DFA) of the examined specimens (n = 214), grouped by drainage, the canonical root 1 explained 88.1 % of the total variation. Sixteen linear characters allow distinguishing O. mykiss nelsoni (Sierra San Pedro Mártir [SSPM]) from O. chrysogaster and O. mykiss sspp. (Sierra Madre Occidental [SMO]). Two distinctive groups of populations were recognized on the basis of the squared Mahalanobis' distances, one for the SSPM (O. m. nelsoni) and the other for the SMO. The latter group is divided into four subgroups: (1) O. chrysogaster (Río Fuerte and Río Culiacán) and O. mykiss ssp. (Río Piaxtla); (2) O. mykiss sspp. (Río San Lorenzo, Río Baluarte, and Río Acaponeta); (3) O. mykiss sspp. (Río Yaqui and Río Mayo); and (4) O. chrysogaster (Río Sinaloa). In the DFA among populations within each taxon, the canonical variable 1 accounted for 41.8% of the total variation for O. m. nelsoni, 59.4% for O. chrysogaster, and 43.8% for O. m. sspp.

Original languageEnglish
Pages (from-to)91-110
Number of pages20
JournalReviews in Fish Biology and Fisheries
Issue number1
StatePublished - 2003

Bibliographical note

Funding Information:
Numerous people participated in the sampling and are greatly acknowledged. Our special thanks go to the field guides B. Félix, I. García and F. García (Mesa de Tres Ríos, Sonora), S. Camuñez, A. Paredes and J. Navarro (Basaseachic, Chihuahua), L. Saavedra and J. Escárcega (Guadalupe y Calvo, Chihuahua), L.A. Ríos (El Salto, Durango), I. Rodríguez and A. Aguilar (San Miguel de Cruces, Durango). D.A. Hendrickson and B. Jensen provided information on trout collecting sites in the SMO. M. Grijalva gave logistical support for temporal storage of frozen specimens in his lab. N. Villarreal, J. Echánove, C. Brum, U. Pacheco, A. Jullian, F. León and J. Zamudio helped with the field work in the SSPM. M.E. Valles and C.A. Reyes for helping in the processing of specimens for morphometric analysis. Finally, we thank E. (Phil) Pister, R.L. Mayden, J.L. Nielsen, Brigitte Gavio and two anonymous reviewers for their helpful comments on the manuscript. This study was funded by the Consejo Nacional de Ciencia y Tecnología (grant: CONACYT 33528-V ). The collecting permit for trout specimens was provided by Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación (number of permit 060201-613-03).


  • Morphometrics
  • Northwestern Mexico
  • Oncorhynchus
  • Variation
  • Wild trout


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