Comparison of otolith and scale readings for age and growth estimation of common dentex <i>Dentex dentex</i>

Baudouin, Marie; Marengo, Michel; Pere, Antony; Culioli, Jean‐Michel; Santoni, Marie-Catherine; Marchand, Bernard; Durieux, Eric

doi:10.1111/jfb.12816

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…The common dentex is gonochoristic, reaching sexual maturity between 2 and 4 years old [ 16 , 17 , 18 ]. It grows to a maximum length of 100 cm and a weight of 13 kg, with a relatively long life span (up to 36 years) [ 19 ]. Due to its large size, flesh quality, and high commercial value, the species is of great interest to both artisanal and recreational fisheries [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Absence of spatial genetic structure in common dentex (Dentex dentex Linnaeus, 1758) in the Mediterranean Sea as evidenced by nuclear and mitochondrial molecular markers

et al. 2018

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The common dentex, Dentex dentex, is a fish species which inhabits marine environments in the Mediterranean and Northeast Atlantic regions. This is an important species from an ecological, economic and conservation perspective, however critical information on its population genetic structure is lacking. Most samples were obtained from the Mediterranean Sea (17 sites) with an emphasis around Corsica (5 sites), plus one Atlantic Ocean site. This provided an opportunity to examine genetic structuring at local and broader scales to provide science based data for the management of fishing stocks in the region. Two mitochondrial regions were examined (D-loop and COI) along with eight microsatellite loci. The COI data was combined with publicly available sequences and demonstrated past misidentification of common dentex. All markers indicated the absence of population genetic structure from the Bay of Biscay to the eastern Mediterranean Sea. Bayesian approaches, as well as the statistical tests performed on the allelic frequencies from microsatellite loci, indicated low differentiation between samples; there was only a slight (p = 0.05) indication of isolation by distance. Common dentex is a marine fish species with a unique panmictic population in the Mediterranean and likely in the Atlantic Ocean as well.

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Section: Introductionmentioning

confidence: 99%

Absence of spatial genetic structure in common dentex (Dentex dentex Linnaeus, 1758) in the Mediterranean Sea as evidenced by nuclear and mitochondrial molecular markers

et al. 2018

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“…1). For teleosts, age was previously estimated by counting annuli on scales but this method underestimates the age of old individuals [25,26]. From now on, age is usually estimated by counting growth increments in otoliths (Fig.…”

Section: Growth Bands Countmentioning

confidence: 99%

“…As a result, otoliths are considered as one of the best tools to estimate age of teleosts [30]. Analysis of sectioned otoliths appears to produce the highest and most accurate estimation of age by improving the readability of growth bands [26]. Statoliths (Fig.…”

Section: Growth Bands Countmentioning

confidence: 99%

Age Determination and Lifespan of Marine Animal Species

Bourg

2019

Reference Module in Biomedical Sciences

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Ectotherms: species whose internal temperature is dependent on the ambient temperature.Endotherms: species whose internal temperature is fixed and regulated by the organism.Fish: paraphyletic group of fin and gill-bearing aquatic vertebrates. The term is used for convenience and refers usually to the teleosts taxa, but some authors may also include other taxa (e.g. elasmobranchs).Iteroparity: a reproductive strategy with several reproductive events during life, these events possibly occurring in successive years.Life-history strategies: strategies selected by natural selection during evolution allowing species to develop, live, and propagate (e.g. species with a short lifespan and many offspring, like mice, vs long-lived species with a few offspring, like elephants).Life-history traits: traits moulding life-history strategies (e.g. body size, age at maturity, duration of development, number of offspring, lifespan).Marine species: aquatic species living in seas and oceans, as opposed to freshwater species living in rivers, ponds, lakes and so on.Record lifespan: longest duration of life of individuals observed in a species. In most marine species, this age can reflect the age at capture and not the maximal lifespan, i.e. the lifespan of the last survivors.

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“…However, many studies have demonstrated that age estimation using fish scales can result in serious underestimation for some species (e.g. Beamish and Chilton 1982;Gray et al 2012;Baudouin et al 2016). Therefore, K. bigibbus age and growth need to be estimated using more accurate age determination methods.…”

Section: Introductionmentioning

confidence: 99%

Using optimised otolith sectioning to determine the age, growth and age at sexual maturity of the herbivorous fish Kyphosus bigibbus: with a comparison to using scales

Ogino

Furumitsu

Kiriyama

et al. 2020

Mar. Freshwater Res.

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Determining the population parameters of herbivorous fishes facilitates our understanding of their overall effects on ecosystems. However, this has not been successful with species such as Kyphosus bigibbus that are difficult to age using otoliths. In this study, we estimated the age, growth and age at sexual maturity of K. bigibbus off the west coast of Kyushu, Japan, using fish scales and otoliths. Scales were found unreliable because they caused underestimation of the age of fish older than 5 years, whereas otoliths were reliable when used with our improved otolith-sectioning methodology. The maximum age and fork length were 46 years and 574mm for females and 32 years and 506mm for males. According to the von Bertalanffy growth curves, females became slightly larger than males, and both sexes showed nearly asymptotic fork lengths after 10 years. The age at 50% sexual maturity for females and males was 3.2 and 1.9 years respectively, which is extremely early considering their maximum age. The year-class composition of K. bigibbus suggests that its recruitment may have increased rapidly since 1999, following noticeable losses of kelp forests in this region. Our findings will contribute to the understanding of algal forest ecosystems and advancement of fish ageing studies.

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Comparison of otolith and scale readings for age and growth estimation of common dentex Dentex dentex

Abstract: Three methods of age estimation were compared for Dentex dentex. Based on sectioned otoliths, scales appeared to be relevant only up to 5 years and whole otoliths up to 12 years. The maximum estimated age was 36 years, which constitutes to date the oldest age reported.

Cited by 12 publications

References 15 publications

Absence of spatial genetic structure in common dentex (Dentex dentex Linnaeus, 1758) in the Mediterranean Sea as evidenced by nuclear and mitochondrial molecular markers

Absence of spatial genetic structure in common dentex (Dentex dentex Linnaeus, 1758) in the Mediterranean Sea as evidenced by nuclear and mitochondrial molecular markers

Age Determination and Lifespan of Marine Animal Species

Using optimised otolith sectioning to determine the age, growth and age at sexual maturity of the herbivorous fish Kyphosus bigibbus: with a comparison to using scales

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