Objectively assigning species and ages to salmonid length data from dual-frequency indentification sonar

William Gurney, Louise O. Brennan, Philip J. Bacon, K.F. Wheelan, Martin O'Grady, Eileen Dillane, Phillip McGinnity

Research output: Contribution to journalArticle

Abstract

Fishery managers need robust ways of objectively estimating the quantitative composition of fish stocks, by species and age-class, from representative samples of populations. Dual-frequency identification sonar data were used to first visually identify fish to a broad taxon (Salmonidae). Subsequently, kernel-density estimations, based on calibrated size-at-age data for the possible component species, were used to assign sonar observations both to species (Atlantic Salmon Salmo salar or Brown Trout Salmo trutta) and age-classes within species. The calculations are illustrated for alternative sets of calibration data. To obtain close and relevant fits, the approach fundamentally relies on having accurate and fully representative subcomponent distributions. Firmer inferences can be made if the component data sets correspond closely to the target information in both time and space. Given carefully chosen suites of component data, robust population composition estimates with narrow confidence intervals were obtained. General principles are stated, which indicate when such methods might work well or poorly.
LanguageEnglish
Pages573-585
Number of pages12
JournalTransactions of the American Fisheries Society
Volume143
Issue number3
DOIs
Publication statusPublished - 9 Apr 2014

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Sonar
sonar
salmonid
Salmo trutta
Salmo salar
age structure
Salmonidae
age class
fish
space and time
confidence interval
managers
Fish
calibration
fisheries
seeds
Fisheries
Kernel Density Estimation
fishery
Assign

Keywords

  • salmon
  • species
  • ages
  • salmonid
  • length data
  • dual frequency
  • identification sonar

Cite this

Gurney, William ; Brennan, Louise O. ; Bacon, Philip J. ; Wheelan, K.F. ; O'Grady, Martin ; Dillane, Eileen ; McGinnity, Phillip. / Objectively assigning species and ages to salmonid length data from dual-frequency indentification sonar. In: Transactions of the American Fisheries Society. 2014 ; Vol. 143, No. 3. pp. 573-585.
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Objectively assigning species and ages to salmonid length data from dual-frequency indentification sonar. / Gurney, William; Brennan, Louise O.; Bacon, Philip J.; Wheelan, K.F.; O'Grady, Martin ; Dillane, Eileen ; McGinnity, Phillip.

In: Transactions of the American Fisheries Society, Vol. 143, No. 3, 09.04.2014, p. 573-585.

Research output: Contribution to journalArticle

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