The Fraser River sockeye population is segregated geographically into a number of individual races. The scales of these fish contain several characters which might be used in the identification of these races. They are number of annuli (winter "checks"), number of first season and second season rings, additional "checks", and general appearance of scales. With few exceptions the Fraser River sockeye are of the 4₂ age group. Birkenhead River, Cultus Lake, and Chilko Lake sockeye have varying numbers of 5₃ fish. The Harrison River fish in general migrate immediately to sea as fry. The Pitt River sockeye in general return as 5₂ fish. Any difference that exists in ring counts between the sexes of sockeye is not significant. In general it was found that the younger sockeye (3₂) have greater numbers of first season lacustrine rings than do the 4₂ sockeye and that in turn the 4₂ fish have more rings than do the 5₂ fish. There is considerable variability from year to year in both first season and second season ring counts for each race. The greatest association in first season ring counts occurs on adjacent years. The ring counts between races within years are in many cases statistically different. The yearly variability within races and the overlapping in ring counts makes the separation of the races in a homogeneous population an impossibility. The ring counts of yearling migrant sockeye have fewer rings than do the adult sockeye of the same brood year. Most of the races have additional checks. On the basis of these studies it is impossible to segregate the various Fraser River races by using scale characters alone. / Science, Faculty of / Zoology, Department of / Graduate

In 1938 and again in 1939 the International Pacific Salmon Fisheries Commission conducted experiments at Cultus Lake in order to test a method of calculating sockeye salmon populations by tagging a certain proportion of the run and to determine the accuracy of the calculated populations. In addition, these experiments were designed to test the value of certain standard statistical procedures which are employed in the analysis of the data. All the sockeye entering the lake were counted through a weir in order to check the accuracy of the calculated populations. The sexes had differential times of migration into the lake. The major portion of each run died within a 7-week period. Tagged fish lived a shorter period of time after passing through the weir than the untagged fish did. A higher ratio of tagged fish died immediately above the tagging location and indicated handling causes some harm to these fish. Accurate results were obtained when certain conditions were fulfilled. Sampling of the dead fish should be conducted throughout the season in a uniform manner. The tag ratio should be determined from the total number of fish examined regardless of sex or size. Use of the Chi-square test of homogeneity in order to determine whether or not the tagged fish are uniformly distributed in the population has an important application providing tagging operations commence prior to the time the major portion of the run commences to die. Accurate results are obtained also from tagging during limited periods of the migration but should commence prior to the time the major portion of the run begins to die. / Science, Faculty of / Botany, Department of / Zoology, Department of / Graduate

Thesis (M.A.)--University of Toronto, 2005. / Includes bibliographical references (leaves 112-118).

Thesis (M.S.)--Oregon State University, 1972. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1966. / Includes bibliographical references (leaves 58-61).

Thesis (M.S.)--Oregon State University, 1966. / Typescript. Includes bibliographical references (leaves 58-61). Also available electronically via World Wide Web in PDF format.

Thesis (M.S.)--Oregon State University, 1999. / Typescript (photocopy). Includes bibliographical references (leaves 29-31). Also available on the World Wide Web.

Thesis (M.R.M.)--Simon Fraser University, 2001. / Includes bibliographical references (leaves 73-78).

Thesis (Ph. D., Natural Resources)--University of Idaho, May 2008. / Major professor: Troy E. Hall. Includes bibliographical references. Also available online (PDF file) by subscription or by purchasing the individual file.

Thesis (Ph. D.)--Oregon State University, 1995. / Typescript (photocopy). Includes bibliographical references (leaves 168-187). Also available on the World Wide Web.