Improving the precision of ageing assessments for long rough dab by using digitised pictures and otolith measurements

Fossen, Inge; Albert, Ole Thomas; Nilssen, Einar M.

doi:10.1016/s0165-7836(02)00063-2

Cited by 23 publications

(27 citation statements)

References 25 publications

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“…Patterns were less distinct in the wild red snapper otoliths, but significance differences were still detected across at least one age group. Red snapper otolith growth and shape patterns were similar to patterns shown for long rough dab (Fossen et al 2003), and Atlantic cod (Galley et al 2006). Both studies showed faster otolith growth along the anterior-posterior axis.…”

Section: Groupsupporting

confidence: 71%

“…Thus, otolith shape, independent of size or weight can be used to correctly assign age classes to young red snapper. Doering-Arjes et al (2008) found similar results using otolith shape to assign ages of knownage Atlantic cod and similar studies have used external features such as otolith size and weight measurements to estimate age of fish (Fossen et al 2003;Petursdottir et al 2006). The cross-validation classification matrices showed 65.6% correct age classification of otoliths from knownage, hatchery fish and 68.9% correct age classification of otoliths from wild fish.…”

Section: Discussionsupporting

confidence: 56%

“…Significant age effects on otolith shape were noted in some studies employing otolith shape analysis to identify fish stocks (Begg and Brown 2000;Galley et al 2006), but few studies have attempted to age fish with this method. Fossen et al (2003) examined alternative methods to increase ageing accuracy of long rough dab, Hippoglossoides platessoides and found a significant correlation between otolith size characteristics and age. In that study, it was suggested that simple otolith measurements could be incorporated into a model to increase ageing accuracy and precision for that species.…”

Section: Introductionmentioning

confidence: 99%

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The use of otolith shape analysis for ageing juvenile red snapper, Lutjanus campechanus

Beyer

Szedlmayer

2010

Environ Biol Fish

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Section: Groupsupporting

confidence: 71%

Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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The use of otolith shape analysis for ageing juvenile red snapper, Lutjanus campechanus

Beyer

Szedlmayer

2010

Environ Biol Fish

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“…The assignment of age to juvenile fish is commonly based on counts of otolith daily growth rings, a time-consuming task which requires long training and experience (Jones 1992). Otolith and fish morphometric characteristics have been shown to be good predictors of age in adult fish of several species (Fossen et al 2003, Lou et al 2005, Steward et al 2009, see review by Francis and Campana 2004). The idea of extending the technique to overcome the particularly difficult task of determining age in juvenile fish has been put forward by Pawson (1990).…”

Section: Introductionmentioning

confidence: 99%

Predicting the age of sardine juveniles (<em>Sardina pilchardus</em>) from otolith and fish morphometric characteristics

2015

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Summary: An age prediction model based on individual morphometric characteristics (total length; weight) and otolith morphometric characteristics (diameter; weight) was investigated for juvenile sardine, Sardina pilchardus (Walbaum, 1792). Juveniles were collected from northern Portugal between May 2004 and January 2005. Daily growth rings were counted on the otoliths of 114 juveniles of 7-16 cm total length. The sample was divided into a training sample used to develop the age prediction model and a test sample used to evaluate the predictive ability of the model. The best model for predicting the logarithm of age was a linear regression with otolith diameter. The prediction of daily age was more accurate for younger (<200 days) juveniles. Overall, ages predicted from the model were unbiased in relation to ages determined from otolith microincrement counts. Moreover, predicted daily ages reproduced the overall shape of the observed age distribution and provided comparable growth estimates (0.041 cm day -1 ). The back-calculated birthdate period ranged from 29 September 2003 to 22 July 2004, with a peak in January 2004, which is consistent with the spawning season. The model presented here could be used as a method for increasing the volume of juvenile daily age data. Since growth and survival varies spatially and temporally, relationships between age and otolith/fish morphometry should not be extrapolated outside sampled periods, areas and fish size/age.

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“…A estimativa da idade e do crescimento em populações de peixes é importante na avaliação dos estoques pesqueiros e vem sendo estudada por diversos autores, correlacionando os resultados obtidos com os aspectos reprodutivos, alimentares, entre outros (FOSSEN; ALBERT; NILSSEN, 2003;PINO et al, 2004).…”

Section: Introductionunclassified

Idade e Crescimento do Bagre Genidens Genidens na Barra da Lagoa do Açu, Norte do Estado do Rio de Janeiro

Oliveira¹,

Novelli²

2005

TropOcean

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RESUMOO objetivo deste trabalho foi determinar e avaliar os aspectos da idade e crescimento do bagre Genidens genidens (Valenciennes, 1839) capturados na lagoa do Açu, uma importante lagoa costeira da região norte do Estado do Rio de Janeiro. As determinações das idades foram obtidas através da contagem dos anéis de crescimento impressos nos otólitos. Os resultados mostraram que a população de G. genidens da lagoa do Açu é composta, predominantemente de indivíduos de 2 a 4 anos de idade, com máximo de 5 anos. A primeira maturação gonadal correspondeu ao primeiro ano de vida para ambos os sexos. A regressão entre o comprimento total e peso total mostrou um crescimento alométrico positivo. A relação entre o comprimento total e idade revelou um rápido crescimento até o primeiro ano de vida, com uma redução após esta idade. Tendência inversa foi observada para a relação peso total e idade, onde um rápido crescimento foi constatado após um ano de idade. O peso do otólito aumentou continuamente durante a vida do G. genidens, indicando que a relação peso do otólito e idade pode ser usada como uma ferramenta adicional nos estudos de determinação da idade e avaliação do crescimento de G. genidens.Palavras chave: idade, crescimento, otólitos, Genidens genidens, lagoa do Açu. ABSTRACT Age And Growth of Catfish Genidens genidens From Açu Lake Sand Bar, North of The Rio de Janeiro StateThe objective of the present work was to determine and assessment the age and growth aspects of catfish Genidens genidens (Valenciennes, 1839) caught in the Açu Lake an important coastal lagoon of the North of the Rio de Janeiro State. Age determinations were obtained counting the annual annuli in the otoliths. In the range of age studied, the results showed that G. genidens populations from Açu Lake have mainly 2 -4 years with maximum age of 5 years. The first years old corresponded to the first gonad maturation from both sex. Regression between total length and total weight showed positive and alometric growth. The total length-age relationship revealed a fasted increasing of length until the first year of life, reducing it after this age. Inverse trend it was observed for total weight-age relationship, with fast growth after one year old. Otolith weight Tropical Oceanography, Recife, v. 33, n. 1, p. 57-66, 2005.

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Improving the precision of ageing assessments for long rough dab by using digitised pictures and otolith measurements

Cited by 23 publications

References 25 publications

The use of otolith shape analysis for ageing juvenile red snapper, Lutjanus campechanus

The use of otolith shape analysis for ageing juvenile red snapper, Lutjanus campechanus

Predicting the age of sardine juveniles (<em>Sardina pilchardus</em>) from otolith and fish morphometric characteristics

Idade e Crescimento do Bagre Genidens Genidens na Barra da Lagoa do Açu, Norte do Estado do Rio de Janeiro

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