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Description: |
ii, 40 pages : illustrations ; 23 cm. |
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Bibliography Note: |
Includes bibliographical references. |
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Contents Note: |
Contents: Determining age of adult Pacific sardines / Kenneth H. Mosher -- Age composition of the commercial catch of Pacific sardines, 1932-28 / Howard H. Eckles. |
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Summary, Etc. Note: |
Abstract: Otoliths and scales taken from some 500 sardines of the December 1942 San Francisco fishery were read to ascertain if the age of adult sardines can be determined from otoliths. Independent readings of both scales and otoliths and their subsequent comparison of lengths of the fish established confidence in the use of otoliths to determine age of sardines. |
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Abstract: Having established the validity of the use of otoliths in determining age of adult sardines, the ages of sardines landed between 1932 and 1938 at Monterey and San Pedro and in 1934 and 1935 in British Columbia were determined from an examination of otoliths collected from samples of the commercial catch. Thus, knowledge of the age composition of the sardine population was extended to include a period of 10 years for which adequate age data were previously lacking. |
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Abstract: Data are also given for the numbers of sardines landed in the years covered by this study, their age composition, length composition, year-class strength, and survival. |
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Additional Physical Forms: |
Online version: Mosher, Kenneth H. Age determination of Pacific sardines from otoliths. Washington, D.C. : Fish and Wildlife Service, U.S. Dept. of the Interior, 1954 (OCoLC)882774428 |