Otolith, Pectoral Fin Ray, and Scale Age Determinations for Arctic Grayling

Síkström, C.

doi:10.1577/1548-8659(1983)45[220:opfras]2.0.co;2

Cited by 29 publications

(37 citation statements)

References 7 publications

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“…Rates of exact agreement between reading pairs for otolith age estimates were generally lower than those reported for other fish species but rates of agreement within one year were similar to values reported in published studies (Welch et al 1993;Isermann et al 2003). Rates of exact agreement between reading pairs and agreement within one year for pectoral fin ray age estimates were within the ranges of values reported in published studies for other fish species (Sikstrom 1983;Welch et al 1993;Rien and Beamesderfer 1994;Spiegel et al 2010). Several studies have reported an effect of reader experience on precision of otolith or fin ray age estimates (Campana and Moksness 1991;Ross et al 2005;Brenden et al 2006), whereas other studies found no difference with experience level (Howland et al 2004;Vandergoot et al 2008).…”

Section: Discussionsupporting

confidence: 81%

“…Pectoral fin rays are another non-lethal alternative to otoliths, and evidence suggests that pectoral fin rays may yield age estimates that are more precise than scales and comparable to otoliths in some fish species (Howland et al 2004;Walsh et al 2008). However, fin rays may also underestimate age of relatively old fish for some species (Maraldo and MacCrimmon 1979;Beamish 1981;Sikstrom 1983;Rien and Beamesderfer 1994;Phelps et al 2007;Stolarski and Hartman 2008).…”

Section: Introductionmentioning

confidence: 99%

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Using pectoral fin rays as a non-lethal aging structure for smallmouth bass: precision with otolith age estimates and the importance of reader experience

Rude

Hintz

Norman

et al. 2013

Journal of Freshwater Ecology

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Journal of Freshwater Ecology, 2013 Vol. 28, No. 2, 199-210, http://dx.doi.org/10.1080/02705060.2012 Using pectoral fin rays as a non-lethal aging structure for smallmouth bass: precision with otolith age estimates and the importance of reader experience We evaluated the potential utility of pectoral fin rays as non-lethal aging structures for smallmouth bass (Micropterus dolomieu). We compared age estimates among three reading pairs and against sectioned sagittal otolith age estimates for precision. Reading pair bias was not detected, although the highest rates of age estimate agreement occurred between reading pairs with high and moderate aging experience. Precision of otolith and fin ray age estimates were equivalent based on between-structure comparisons of average percent error and coefficient of variation. However, fin rays underestimated fish age compared to otoliths for older fish, especially when aged by less-experienced readers. Pectoral fin rays may provide a non-lethal alternative to otoliths for aging smallmouth bass, particularly for younger fish (age 4) or when experienced readers conduct aging. Additional evaluations of fin rays as smallmouth bass aging structures are needed, including validation using known-age fish and documentation of consistent annulus formation throughout a fish's life.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Using pectoral fin rays as a non-lethal aging structure for smallmouth bass: precision with otolith age estimates and the importance of reader experience

Rude

Hintz

Norman

et al. 2013

Journal of Freshwater Ecology

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“…Yole (1975) ranked scales above otoliths for aging Yukon grayling, with 80-90% agreement between the two methods. Otoliths were the preferred material for aging Marshall Creek grayling in the Yukon, with scale ages being lower than ages determined by otolith or fin rays (Sikstrom, 1983). Similarly Merritt and Fleming (1991) showed that estimated age from whole otoliths was most precise and gave significantly older ages than other methods (scales, sectioned pelvic fin rays, whole and sectioned vertebrae, whole and sectioned opercula, broken and burned otoliths).…”

Section: Age Determination and Validationmentioning

confidence: 99%

Comparative biology and management of Arctic and European grayling (Salmonidae, Thymallus)

Northcote¹

1995

Rev Fish Biol Fisheries

155

175

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“…This comparison was visualized by plotting the finray age as a function of otolith age for each fish. A line denoting the ideal 1:1 relationship was used for reference (Beamish & Harvey 1969, Sikstrom 1983). Lin's ρ c (Lin 1989(Lin , 2000 was used to examine the 1:1 agreement between the 2 ageing methods.…”

mentioning

confidence: 99%

Evaluation of finrays as a non-lethal ageing method for protected goliath grouper Epinephelus itajara

Murie¹,

Parkyn²,

Koenig³

et al. 2009

Endang. Species. Res.

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Currently, there is a conflict between the need to conserve protected fish species and the need to use lethal methods to collect essential biological data, such as age, to assess their population status and recovery trends. We evaluated the precision and accuracy of a non-lethal ageing method for goliath grouper Epinephelus itajara, listed as critically endangered on the IUCN Red List of Threatened Species. Paired finray and otolith samples (n = 21) were collected opportunistically from fish that had died primarily from red tide or hypothermal events in Florida coastal waters. Finray ageing proved relatively precise (coefficient of variation [CV] = 4.24%), although less so than otolith ageing (CV = 1.45%). Finray ages agreed with otolith ages the majority of the time (CV = 3.15% and concordance correlation coefficient = 0.991) for E. itajara from 0 to 18 yr of age. Based on a test of symmetry, finray ageing was also relatively unbiased for fish up to 18 yr of age. Further evaluation of any limitations of the method will depend on obtaining more samples, especially from larger, presumably older, fish. Clearly, the non-lethal finray ageing method can be used as an alternative to using otoliths for goliath grouper at least up to 18 yr of age. Finray ageing could significantly reduce the need to sacrifice protected E. itajara to assess their population recovery. KEY WORDS: Epinephelus itajara · Goliath grouper · Otoliths · Finrays · Non-lethal ageing · Florida Resale or republication not permitted without written consent of the publisher OPEN PEN ACCESS CCESS Contribution to the Theme Section 'Range-wide status and conservation of the goliath grouper'Endang Species Res 7: 213-220, 2009 their original distribution range throughout southwest Florida and the Florida Keys, while the frequency of adult sightings has increased in offshore artificial structures of southwestern Florida (Cass-Calay & Schmidt 2003, Porch & Eklund 2003, Frias-Torres 2006, NMFS 2006. This apparent population increase has generated requests by fishermen to re-open the fishery in Florida.Assessing the population status of both juvenile and adult goliath grouper is critical for addressing these over-exploitation and recovery issues (Kingsley 2004). Obtaining biological data is essential for estimating population parameters (i.e. growth, age-specific reproductive potential, recruitment, and mortality rates; Haddon 2001) that are used as input to stock assessments to predict recovery trajectories. The problem faced by management agencies is how best to obtain the data required for stock assessment without jeopardizing the very population they are trying to protect. The crux of the problem is that most bony fishes are aged by using their sagittal otoliths, which requires killing the fish. Ageing goliath grouper with this method is clearly inconsistent with the goal of conserving the species. Non-lethal ageing methods present a viable alternative, in which dorsal or pectoral finrays can be removed from live fish, which are subsequently re...

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Otolith, Pectoral Fin Ray, and Scale Age Determinations for Arctic Grayling

Cited by 29 publications

References 7 publications

Using pectoral fin rays as a non-lethal aging structure for smallmouth bass: precision with otolith age estimates and the importance of reader experience

Using pectoral fin rays as a non-lethal aging structure for smallmouth bass: precision with otolith age estimates and the importance of reader experience

Comparative biology and management of Arctic and European grayling (Salmonidae, Thymallus)

Evaluation of finrays as a non-lethal ageing method for protected goliath grouper Epinephelus itajara

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