Age and growth study of Tillamook Bay chum salmon (Oncorhynchus keta) Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/bc386q13z

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Ages were determined for 65 fish from the 1947 run and for 287 fish from the 1949 run. In 1947 the percentage composition by age was as follows: 32.3 percent 3-year-old fish, 66.2 percent 4-year-old fish, and 1.5 percent 5-year-old fish. An approximate 95 percent confidence interval for the true proportion of 4-year-old fish was 54.7 to 77.7 percent. In 1949 the percentage composition by age was as follows: 5.2 percent 3-year-old fish, 94.4 percent 4-year-old fish, and 0.4 percent 5-year-old fish. An approximate 95 percent confidence interval for the true proportion of 4-year-old fish in 1949 was 91.7 to 97.1 percent. Sex ratios during the course of the run were computed. It appeared that during the latter part of October there were significantly more males than females in the catch. During November the number of males and females tended to be nearly equal. Finally, during the first part of December there were more females than males in the catch. Growth for the earlier ages was determined by analyzing the growth of the scales and then assuming that scale growth was proportionate to fish growth throughout life. It appeared that the greatest absolute increase in length occurred in the first year of life, and that the greatest absolute increase in weight occurred during the last year of life. Length-weight equations were computed for both the males and the females. When tested by means of a t-test, these equations proved to be significantly different. These equations are: for the males W = 0.000234 [superscript L3.19370]; for the females W = 0.000430 [superscript L 3.01479]. In comparing Tillamook Bay chum salmon with chum salmon from other localities, it was observed that chums of like age decrease in average length from south to north. Tillamook Bay chums do not follow the tendency for the percentage of younger fish to decrease from south to north. Finally, there are limitations to some of the results determined in the study because of the assumptions upon which these results are based. The principal limitation is the small amount of data available. Furthermore, the following assumptions were made, and if they were not true, they could invalidate the results obtained: (1) fish length increases in direct proportion to scale growth; (2) the samples used in this study do not represent an abnormal year and do represent the populations sampled; (3) ages of these fish can be determined from their scales; and (4) that the sexes can be determined by their external characteristics.
Resource Type
Date Available
Date Issued
Non-Academic Affiliation
Keyword
Subject
Table of Contents
  • Introduction -- Biological aspects of Tillamook Bay chum salmon -- Methods of collecting data -- Age composition -- Sex ratio -- Growth as determined by scale analysis -- Methods used for growth studies -- Growth in length -- Growth in weight -- Length-weight relationship -- Comparison with other areas -- Summary -- Acknowledgments -- Literature cited.
Rights Statement
Publisher
Peer Reviewed
File Format
File Extent
  • 123781356 bytes
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2006-08-25T19:40:44Z (GMT) No. of bitstreams: 1 Age+Growth_Chum_Salmon_ocr.pdf: 123781356 bytes, checksum: 7561321065ccd659b190d43e027b9bf1 (MD5)
  • Contribution (Oregon Fish Commission)
  • description.provenance : Made available in DSpace on 2006-08-25T21:03:41Z (GMT). No. of bitstreams: 1 Age+Growth_Chum_Salmon_ocr.pdf: 123781356 bytes, checksum: 7561321065ccd659b190d43e027b9bf1 (MD5) Previous issue date: 1954
  • no. 19.
  • Reports and Publications -- Other Reports and Publications
  • description.provenance : Submitted by Anna Opoien (bballgrl4life@hotmail.com) on 2006-08-25T15:31:08Z No. of bitstreams: 1 Age+Growth_Chum_Salmon_ocr.pdf: 123781356 bytes, checksum: 7561321065ccd659b190d43e027b9bf1 (MD5)
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2006-08-25T21:03:40Z (GMT) No. of bitstreams: 1 Age+Growth_Chum_Salmon_ocr.pdf: 123781356 bytes, checksum: 7561321065ccd659b190d43e027b9bf1 (MD5)

Relationships

In Administrative Set:
Last modified: 12/05/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items