Comparison of pelvic fin rays, scales and otoliths for estimating age and growth of bull trout, <i>Salvelinus confluentus</i>

Zymonas, Nikolas D.; McMahon, Thomas E.

doi:10.1111/j.1365-2400.2008.00640.x

Cited by 46 publications

(50 citation statements)

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“…Otoliths were found to be more suitable for aging than were scales for a large number of species, such as lake whitefish (Coregonus clupeaformis [Barnes and Power, 1984]), striped bass (Morone saxatilis [Welch et al, 1993;Secor et al, 1995]), white crappie (Pomoxis annularis [Boxrucker, 1986]), bluefish (Pomatomus saltatrix [Robillard et al, 2009]), bull trout (Salvelinus confluentus [Zymonas and McMahon, 2009]), Dolly Varden (Salvelinus malma [Stolarski and Sutton, 2013]), and summer flounder (Paralichthys dentatus [Sipe and Chittenden, 2001]). Although comparisons between scales and otoliths have been relatively common, more comprehensive studies that involve multiple structures are rarer.…”

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confidence: 99%

Comparison of 4 aging structures in the American shad (Alosa sapidissima)

Elzey¹,

Rogers²,

Trull³

2014

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Abstract-Multiple structures can be used for the age determination of fishes. Choosing the structure that provides the most precise ages is important for the provision of consistent data for the management of commercially and recreationally important species, such as the American shad (Alosa sapidissima). In this study, we compared the precision of age estimates obtained from sagittal otoliths, vertebrae, scales, and opercula as structures for the age determination of American shad. Two readers examined structures removed from 462 American shad, which were collected from the Merrimack River in Lawrence, Massachusetts, during May and June of 2008-2010. The precision of age estimates were evaluated by comparisons of ages from different readers and structures. Age estimates determined from otoliths were the most precise (76.2% agreement, 2.99% coefficient of variation). Ages derived from scales were overestimated in young (≤5 years) fish and underestimated in older (≥7 years) fish, compared with ages determined from otoliths. Age estimates determined from vertebrae agreed with those obtained from otoliths better than ages from any other structure tested, but they were less precise and vertebrae required more processing than otoliths. Opercula were difficult to read, resulting in underestimation of the ages of fish that were age 5 and older. The results of this study indicate that the sagittal otolith is the most appropriate structure for determining the age of American shad.

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confidence: 99%

Comparison of 4 aging structures in the American shad (Alosa sapidissima)

Elzey¹,

Rogers²,

Trull³

2014

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“…Fin rays are considered a non-lethal alternative to internal bones (DeVries and Frie 1996;Zymonas and McMahon 2009). Some studies suggested that aging was more precise with fin rays as compared to other structures.…”

Section: Discussionmentioning

confidence: 99%

“…Dorsal fin rays were more suitable than other structures for aging B. rajanorum mystaceas (Polat 1987a) and C. trutta (Polat 1987b). However, other investigators rejected fin rays on account of difficulties with sample preparation, identification of the first annulus, and distinction between true and false annuli (Zymonas and McMahon 2009). Quinn and Ross (1982) questioned the reliability of age estimates from pectoral fin rays in fish older than 7 years because of the lack of annulus formation and the difficulty in interpreting fin ray sections.…”

Section: Discussionmentioning

confidence: 99%

“…Quinn and Ross (1982) questioned the reliability of age estimates from pectoral fin rays in fish older than 7 years because of the lack of annulus formation and the difficulty in interpreting fin ray sections. Thus, suitability of fin rays for aging may vary among species and potentially among populations (Zymonas and McMahon 2009). Due to difficulty in the correct identification of annuli in dorsal fin rays, fish age may be underestimated, leading to imprecise estimation of growth and other biological parameters.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have focused on comparing ages enumerated from different bony structures in an attempt to quantify the precision and to identify possible bias associated with each structure. Comparisons of age estimates from various structures have been studied for many species such as Barbus rajanorum mystaceus (Polat 1987a), Capoeta trutta (Polat 1987b), Labeo rohita, Catla catla, and Channa marulius (Khan and Khan 2009), Cyprinus carpio (Phelps et al 2007), and Salvelinus confluentus (Zymonas and McMahon 2009).…”

Section: Introductionmentioning

confidence: 99%

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Precision of aging structures for Indian major carp,Cirrhinus mrigala, from the River Ganga

Khan

Miyan

2011

Journal of Freshwater Ecology

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Scales, opercular bones, otoliths, vertebrae, and dorsal fin rays were compared to ascertain the best aging structure of Cirrhinus mrigala. All structures showed alternating opaque and translucent bands that were interpreted as annuli; however, structures differed greatly in the clarity of their presumed annual marks. Age estimates were compared by calculating the percentage of agreement (PA), average percentage of error (APE), and coefficient of variation (CV) and by constructing age bias plots. Age estimates were evaluated between readers and between the pairs of aging structures. Among all structures, scales showed the clearest annual rings and had highest (94.6%) PA between readers, followed by opercular bones (88.6%), otoliths (83.9%), vertebrae (79.9%), and dorsal fin rays (62.4%). Due to highest PA and lower minimal aging error, the scales were considered the most reliable bony structure for aging C. mrigala. When scale ages were compared with those of the other structures, the highest PA and lowest APE and CV values were found between scale and opercular bone estimates. Mean values of age estimate from scales were comparable ( p40.05) to the values obtained from opercular bones, otoliths, and vertebrae and were significantly ( p50.05) different with the dorsal fin ray age estimates. Scales were the most suitable structures for age estimation in C. mrigala.

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Precision of Calcified Structures Used for Estimating Age of Chain Pickerel

Bauerlien

Cornett

Zielonka

et al. 2018

N American J Fish Manag

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With the exception of Northern Pike Esox lucius, there is a paucity of information on the precision of age estimates based on calcified structures for esocid species, especially Chain Pickerel E. niger. We estimated ages for 42 Chain Pickerel from Stevens Creek Reservoir on the Savannah River, South Carolina-Georgia. Ages were estimated using sectioned pelvic, pectoral, dorsal, and anal fin rays, scales, cleithra (sectioned and whole), and otoliths to assess precision between repeated readings (four readers). Precision was evaluated by calculating agreement among readers, CV, and mean absolute difference (MAD) in estimates between reader pairs. We tested for differences in precision of estimates among structures using linear mixed models with CV or MAD as the response. Finally, we used age bias plots to evaluate whether there were structure or reader-related systematic biases in estimates. Coefficient of variation and MAD were significantly related to structure type (CV: P = 0.006, MAD: P = 0.001) and mean estimated age (CV: P < 0.001, MAD: P = 0.025). Precision was poor for all structures and poorest for age-0 fish; however, all analyses indicated that otoliths provided the most precise estimates. We observed agreement in estimates among all readers for 40% of the otoliths examined and consensus agreement for 74% of the estimates. Coefficient of variation for otoliths declined from 67% for fish with a mean estimated age of 0 years to 5% for age-4 fish. Conversely, MAD for otoliths increased from 0.34 years for fish with a mean estimated age of 0 to 0.46 years for age-4 fish. Estimates from all structures, except pectoral rays, were negatively biased compared with estimates from otoliths. We recommend the use of otoliths for age estimation of Chain Pickerel, but managers and researchers should be cognizant of and evaluate the potential effects of variability in age estimates among readers on their analyses.

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Comparison of pelvic fin rays, scales and otoliths for estimating age and growth of bull trout, Salvelinus confluentus

Cited by 46 publications

References 38 publications

Comparison of 4 aging structures in the American shad (Alosa sapidissima)

Comparison of 4 aging structures in the American shad (Alosa sapidissima)

Precision of aging structures for Indian major carp,Cirrhinus mrigala, from the River Ganga

Precision of Calcified Structures Used for Estimating Age of Chain Pickerel

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