A Method for Comparing the Precision of a Set of Age Determinations

Beamish, Richard; Fournier, David

doi:10.1139/f81-132

Cited by 872 publications

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“…Three rings readings were performed for each otolith for the same reader. After this procedure, we performed the consistency analyses among the readings for a given lamina, using the Average Percent Error (APE) (Beamish, Fournier, 1981), where: n = number of otoliths; r i = number of readings for each otolith i; a ij = the number of rings in otolith j in reading i; a i = average age calculated for the otolith i.…”

Section: Methodsmentioning

confidence: 99%

Age and growth of the white croaker Micropogonias furnieri (Perciformes: Sciaenidae) in a coastal area of Southeastern Brazilian Bight

2017

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1Studies on age and growth of fish populations have direct application in fisheries and contribute for policies of conservation. Our aim was update information on the Micropogonias furnieri growth parameters based on sagittae otoliths annulis readings, and we expected that the studied population from Southeast Brazil can reach more longevity than the reported in the available literature. We examined 286 individuals between August-2010 and July-2011 from Ubatuba Bay, SP. The Total Length ranged 200-480 mm. The determined growth parameters were: Males, L ∞ =523.4mm, k = 0.05×year -1 , t 0 = -8.78 year; Females L ∞ = 573.5mm, k = 0.06 × year -1 , t 0 = -7.49 year. The MI and % of edge type evidenced the formation of one ring per year during autumn/winter, coinciding with low temperature and low growth rate. These results differed from those reported for the Vazzoler's Population I (summer), and we detected higher longevity (45-48 years) as compared with the recorded in the available information.Keywords: Coastal fishes, Growth parameters, Longevity, Marginal increment, Ubatuba.Estudos de idade e crescimento de peixes têm aplicação direta na biologia pesqueira e contribuem para medidas de conservação.

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Section: Methodsmentioning

confidence: 99%

Age and growth of the white croaker Micropogonias furnieri (Perciformes: Sciaenidae) in a coastal area of Southeastern Brazilian Bight

2017

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“…3). The precision between two readings was computed using the index Average Percent Error (APE) by Beamish & Fournier (1981).…”

Section: Methodsmentioning

confidence: 99%

Age and growth of the dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in Abrolhos Bank, Northeastern Brazil

et al. 2011

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We determined the age and growth of the dog snapper (Lutjanus jocu), caught in the region of Abrolhos Bank, Bahia State, by the fishermen from coastal communities of Prado, Alcobaça, Caravelas, and Nova Viçosa. We examined 205 sectioned otoliths of fish caught by harpoon, longline, hand line, and gill nets (14.5 to 79.5 cm fork length). The formation of each ring was considered annual. The sectioned otoliths showed between 0 and 29 rings. Nearly half of the analyzed specimens had between 0 and 7 rings (88 of 205). Fish caught with nets in the estuarine region were the juvenile, while fish caught with lines and harpoons were the oldest. Two von Bertalanffy growth models were fitted to length-at-age data: one assuming constant variance of length-at-age (SVB) and another assuming constant coefficient of variation, i.e. variance increasing as a function of average size (CVVB). The SVB estimates were Loo = 87.82 cm, K = 0.10, and t0 = -1.486 and the CVVB estimates were Loo = 117.60 cm, K = 0.06, and t0 = -2.470. The largest Loo values estimated by the CVVB model are supported by reports from the literature of larger animals occurring in the deeper outer shelf of Abrolhos Bank. Growth parameters were also estimated for males and females separately (SVB model) (Loo = 92.80 cm, K = 0.099, and t0 = -1.680 for males, and Loo = 82.10 cm, K = 0.105, and t0 = -1.570 for females).

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“…The precision of the readings was estimated by the IAPE calculation (Index Average Percent Error) by Beamish & Fournier (1981), with two readers conducting consecutive and independent readings. The first reader analyzed the sets of whole and sectioned otoliths three times, and the second reader two times.…”

Section: ___________mentioning

confidence: 99%

Age, growth and mortality of dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in the northeast coast of Brazil

Rezende¹,

Ferreira

2004

Braz. j. oceanogr.

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fish were sampled (n=3.539) in the northeast portion of the Brazilian Exclusive Economic Zone. Sagitta otoliths were extracted from a sub sample of 216 individuals caught around the oceanic bank Sirius (03°59' s; 35°59' w) and over continental shelf from Ceará (05°03's; 36°02'w) to Bahía States (09°01's; 35°12'w). Opaque bands, presumed to be annual, were observed on whole (n= 210) and sectioned (n= 197) otoliths, showing ages from 0 to 20 and from 0 to 25 years respectively. The von Bertalanffy growth model was fit to length-at-age data resulting in the values of L∞= 77.22 cm, K= 0.110 and t 0 = -3.73. Incremental widths from the first to twentieth opaque band on sectioned otoliths (n = 39) were used on back calculation of length-at-ages and the estimated values were L∞= 71,20 cm, K= 0.112 e t 0 = -4.32. Otolith reading from sections is a reliable technique for aging L. jocu, which presented medium to high longevity and slow growth. Total mortality (Z) estimated by the catch curve was 0.134 corresponding to an annual survival rate of 87.5%. The natural mortality (M) estimated by the Ault et al. (1998) methodology was 0.12 for 25 years of longevity. R E S U M OIdade e crescimento do Lutjanus jocu foi determinada através da leitura de marcas de aposição em otólitos sagittae. 216 indivíduos, capturados no entorno da montanha oceânica Sirius e na plataforma continental do Ceará (05°03's; 36°02'w) até a Bahia (09°01's; 35°12'w) tiveram seus otólitos extraídos. Marcas opacas que provavelmente formam-se anualmente foram observadas em otólitos inteiros (n=210) e em otólitos seccionados (n=197) apresentando peixes com idades entre 0 a 20 e 25 anos respectivamente. O modelo de crescimento de Bertalanffy ajustado por métodos não lineares dos mínimos quadrados aos dados de idade e comprimento resultou em valores de L∞= 77,22 cm, K= 0,110 and t 0 = -3,73. Medidas incrementais da 1ª a 20ª marca opaca em otólitos seccionados (n=39) foram usadas para retrocalcular os comprimentos e as respectivas idades resultando em valores de L∞= 71,20 cm, K= 0,112 e t 0 = -4,32. Leitura de otólitos seccionados de L. jocu é uma técnica confiável para a determinação da idade e crescimento desta espécie, que apresentou longevidade de média a alta com crescimento lento. A taxa de mortalidade total (Z) estimada através da curva de captura foi 0,134 correspondendo a 87,5% de sobrevivência anual. A mortalidade natural (M) calculada pelo método de Ault et al. (1998) foi 0,12 para uma longevidade de 25 anos.

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A Method for Comparing the Precision of a Set of Age Determinations

Abstract: An index of average percent error is a better estimate of the precision of age determinations than the conventional percent agreement method because it is not independent of the age of a species.Key words: age determination, aging errors

Cited by 872 publications

References 0 publications

Age and growth of the white croaker Micropogonias furnieri (Perciformes: Sciaenidae) in a coastal area of Southeastern Brazilian Bight

Age and growth of the white croaker Micropogonias furnieri (Perciformes: Sciaenidae) in a coastal area of Southeastern Brazilian Bight

Age and growth of the dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in Abrolhos Bank, Northeastern Brazil

Age, growth and mortality of dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in the northeast coast of Brazil

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