Otoliths sagittae of Merluccius hubbsi: an efficient tool for the differentiation of stocks in the Southwestern Atlantic

Vaz‐dos‐Santos, André Martins; Santos-Cruz, Nayra Nicolau dos; Souza, Dmitri; Giombelli-da-Silva, Aline; Gris, Bárbara; Rossi-Wongtschowski, Carmen Lúcia del Bianco

doi:10.1590/s1679-87592017143506503

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…Traditionally, the morphological characteristics of otoliths have been used to identify prey, but shape indices could also be an efficient tool in identifying prey in stomach contents of ichthyophagous organisms. Shape indices of otoliths are widely used for differentiation of fish stocks (Avigliano et al ., 2015; Zischke et al ., 2016; Vaz-dos-Santos et al ., 2017) and identification of ontogenetic variations (Cañas et al ., 2012; Carvalho et al ., 2015). However, otolith shape indices have not yet been used as a tool to aid in the identification of species in stomach contents of ichthyophagous organisms, although these indices are easy to apply and provide excellent results for description and differentiation of species (Tuset et al ., 2003; Volpedo & Echeverría, 2003; Rondon et al ., 2014).…”

Section: Introductionmentioning

confidence: 99%

Otolith shape index: is it a tool for trophic ecology studies?

Carvalho

Spach²,

Vaz‐dos‐Santos

et al. 2019

J. Mar. Biol. Ass.

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The aim of this study was to test the effective separation of shape indices of otoliths of three species belonging to the family Sciaenidae before and after in vitro digestion. We measured 328 sagittal otoliths and applied six shape indices. Before the experiment, the aspect ratio (otolith height/otolith length%), circularity, ellipticity and relative surface of the sulcus acusticus were suitable for differentiating the species of genera Paralonchurus and Stellifer. Among the species of Stellifer, the aspect ratio and rectangularity were suitable. Otoliths exposed to in vitro digestion showed no significant differences in their morphometry before and after the experiment. After in vitro digestion, the aspect ratio and circularity were effective in separating Paralonchurus and Stellifer. However, none of the indices used in the present study were efficient to separate otoliths of congeneric species after in vitro digestion.

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Section: Introductionmentioning

confidence: 99%

Otolith shape index: is it a tool for trophic ecology studies?

Carvalho

Spach²,

Vaz‐dos‐Santos

et al. 2019

J. Mar. Biol. Ass.

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Age estimation, growth and maturity of the Argentine hake (Merluccius hubbsi Marini, 1933) along the northernmost limit of its distribution in the south-western Atlantic

Costa

Braga

Vieira

et al. 2018

Marine Biology Research

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Highlighting growth regulation processes in fish populations by a simplex simulation approach: application to Merluccius hubbsi stocks in the Southwestern Atlantic

Semmar

Vaz‐dos‐Santos

2019

ICES Journal of Marine Science

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A new simplex-based simulation approach (Spx) was developed to highlight multidirectional and multi-scale relationships between morphometric variables helping to functionally differentiate biological (fish) groups for better stocks definition and monitoring. Application concerned Merluccius hubbsi sampled in 1968–1972 and 2004 in six Southwestern Atlantic areas. Simulation results highlighted negative trends opposing front to back compartments indicating competition for body biomass distribution. However, top and bottom parts within these compartments were positively correlated indicating cooperative processes in favour of target local growth regulation. Positive and negative trends of growth regulation were also highlighted at lower body scale, notably between smaller components constituting body front compartment. On a geographical scale, average regulation levels of same morphometric variables showed monotonic or alternated variations between successive fish groups. This highlighted target and modulated growth regulations governing biomass distribution in different body parts by geographical-dependent ways. Under dynamical aspect (1968–1972 vs. 2004), growth regulation of mouth tended to increase with time leading to conclude on morphometric responses of M. hubbsi to overfishing pressure. Spx results were confirmed by several traditional approaches which showed less integrative aspect.

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Otoliths sagittae of Merluccius hubbsi: an efficient tool for the differentiation of stocks in the Southwestern Atlantic

Cited by 4 publications

References 26 publications

Otolith shape index: is it a tool for trophic ecology studies?

Otolith shape index: is it a tool for trophic ecology studies?

Age estimation, growth and maturity of the Argentine hake (Merluccius hubbsi Marini, 1933) along the northernmost limit of its distribution in the south-western Atlantic

Highlighting growth regulation processes in fish populations by a simplex simulation approach: application to Merluccius hubbsi stocks in the Southwestern Atlantic

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