Back-Calculation of Fish Length from Scales: Empirical Comparison of Proportional Methods

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dc.contributor.author Pierce, Clay
dc.contributor.author Rasmussen, Joseph
dc.contributor.author Pierce, Clay
dc.contributor.author Leggett, William
dc.contributor.department Animal Ecology
dc.date 2018-02-16T13:36:50.000
dc.date.accessioned 2020-06-29T22:44:45Z
dc.date.available 2020-06-29T22:44:45Z
dc.date.issued 1996
dc.description.abstract <p>We compared three proportional back-calculation methods for scales using data sets for pumpkinseeds Lepomis gibbosus and golden shiners Notemigonus crysoleucas from 10 southern Quebec lakes, and we validated back-calculations by comparing them with observed lengths at lime of annulus formation. Ordinary least-squares regression (OR) was compared with geometric mean regression (GMR) for describing body-scale relationships. Although minor differences were detected in body-scale regressions among lakes, pooling data across lakes yielded linear bodyscale relationships with very high r2. Differences between OR and GMR body-scale relationships were negligible in both species. Likewise, all back-calculation methods produced equivalent results. Back-calculated lengths generally corresponded well with observed lengths in all pumpkinseeds age-classes and in golden shiners older than 1 year. Observed lengths were often greater than back-calculated lengths for age-1 golden shiners. Our results, indicating little or no difference among methods, contradict recent reviews claiming substantial disagreement among methods. Tighter body-scale relationships in our data sets than in previous studies appear to explain this contradiction. We suggest that light body-scale relationships are attainable for many species, obviating concern over which proportional back-calculation method is chosen.</p>
dc.description.comments <p>This article is from <em>Transactions of the American Fisheries Society</em> 125 (1996): 889, doi:<a href="http://dx.doi.org/10.1577/1548-8659(1996)125%3C0889:BCOFLF%3E2.3.CO;2" target="_blank">10.1577/1548-8659(1996)125<0889:BCOFLF>2.3.CO;2</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/aecl_pubs/2/
dc.identifier.articleid 1002
dc.identifier.contextkey 7227054
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath aecl_pubs/2
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1881
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/aecl_pubs/2/1996_Pierce_BackCalculation.pdf|||Fri Jan 14 22:04:47 UTC 2022
dc.source.uri 10.1577/1548-8659(1996)125<0889:BCOFLF>2.3.CO;2
dc.subject.disciplines Aquaculture and Fisheries
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.disciplines Terrestrial and Aquatic Ecology
dc.subject.keywords anulus formula
dc.subject.keywords ordinary least-squares regression
dc.subject.keywords geometric mean regression
dc.title Back-Calculation of Fish Length from Scales: Empirical Comparison of Proportional Methods
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 647b4288-e653-420b-af82-045d17bb4908
relation.isOrgUnitOfPublication dc916ec7-70d9-48fc-a9b4-83f345e17b12
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