Otolith shape analysis as a tool for stock discrimination of forkbeard (Phycis phycis) in the Northeast Atlantic

Vieira, Alberto; Neves, Ana; Sequeira, Vera; Paiva, Rafaela Barros; Gordo, Leonel Serrano

doi:10.1007/s10750-014-1809-5

Cited by 30 publications

(24 citation statements)

References 34 publications

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“…Results of body geometric morphometric analysis obtained in this study suggests its usefulness as a population differentiation tool and indicate the existence of at least three phenotypically distinct local populations in the Northeast Atlantic, as reported by Vieira et al [19] using otolith shape analysis. This population differentiation suggests a link between the levels of phenotypic divergence and geographical distance, and also a limited adult fish migration between populations from the Azores, Madeira and mainland Portugal.…”

Section: Discussionsupporting

confidence: 83%

“…Genetic data suggest that the forkbeard forms a panmictic population in the Northeast Atlantic and the Mediterranean, and body shape variations indicate, as otolith shape analysis had already shown [19], a clear separation between the three populations from the Northeast Atlantic. The absence of a clear genetic structure and the differences in forkbeard morphology are not contradictory, since neutral genetic markers were used in this study.…”

Section: Discussionmentioning

confidence: 81%

“…Despite its economic importance, the population structure of forkbeard is still unknown. The only published study on this subject, based on otolith shape analysis, showed the possible existence of more than one stock unit of the forkbeard in the Northeast Atlantic, suggested by the separation of populations from Azores, Madeira and mainland Portugal [19]. …”

Section: Introductionmentioning

confidence: 99%

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Genetic and Morphological Variation of the Forkbeard, Phycis phycis (Pisces, Phycidae): Evidence of Panmixia and Recent Population Expansion along Its Distribution Area

et al. 2016

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The knowledge of population structure of a species is essential to effectively assess and manage fisheries. In the present study, genetics, by mitochondrial DNA cytochrome b sequence analysis, and body geometric morphometrics were used to evaluate the existence of distinct populations of the forkbeard (Phycis phycis), an important commercial species in several European countries, especially Portugal and Spain. For geometric morphometric analysis, specimens were collected in the Northeast Atlantic Ocean—Azores, Madeira and mainland Portugal, and for genetic analysis, these samples were complemented with samples collected in the Mediterranean Sea—Spain, Italy and Croatia, in order to cover the entire distribution area of the species. Body shape of the forkbeard from the Northeast Atlantic was found to be highly variable. This variation was probably associated with different environmental factors between the study areas. Despite morphological variation, a low genetic differentiation between samples from different areas was found, most likely due to gene flow that occurred in the past or with the demographic history of the species. Moreover, the presence of unique haplotypes in the Northeast Atlantic and in the Mediterranean suggests that recent gene flow between populations from these areas should be limited. Altogether, a high haplotype diversity, a low nucleotide diversity, a “star-like” network and the results of the mismatch distribution, indicate a possible signature of recent population expansions, which probably started during the end of the Last Glacial Maximum and led to the colonization of the Northeast Atlantic and the Mediterranean.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Genetic and Morphological Variation of the Forkbeard, Phycis phycis (Pisces, Phycidae): Evidence of Panmixia and Recent Population Expansion along Its Distribution Area

et al. 2016

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“…It does not seem to be true for the offshore rockfish P. kuhlii and the European conger C. conger, which are probably North-East Atlantic stocks (Correia et al, 2012;Catarino et al, 2013). On the other hand, some studies seem to support this assumption for the forkbeard P. phycis (Vieira et al, 2014(Vieira et al, , 2016 and the blackbelly rosefish H. dactylopterus (Aboim et al, 2005;Swan et al, 2006;Neves et al, 2011;Sequeira et al, 2010Sequeira et al, , 2012.…”

Section: Fishing Exploitation Effects and Considerations For Managementmentioning

confidence: 99%

Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings

Santos

Silva

Novoa‐Pabon

et al. 2019

Aquat. Living Resour.

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To obtain important baseline information about population dynamics and to provide valuable insights about the possible effects of artisanal fishing on the demersal fish community, this study had three specific objectives: (1) to update the annotated list of demersal teleost species occurring in the Azores (mid-North Atlantic); (2) to describe their depth distribution and related fishery information; and (3) to evaluate annual changes in their observed abundance and length composition. To do this, a time series with about 25 years of scientific data from the commercial fishery and surveys was analyzed. The demersal teleost community was represented by 213 species, predominantly deep-water species, reflecting the main marine habitat in the Azores region. Fishery takes place mainly in the intermediate strata (200–600 m), where the most commercially important species occur. No changing in the fork length (LF) distribution toward small individuals caused by size-selective fishing was detected in this study. The high variability observed in the LF data indicates the need for more accurate studies considering alternative statistical analyses (e.g., generalised linear models) to examine the possible factors (e.g. depth coverage, gear configuration, soak time, and fishing area) that cause this variability. On the other hand, the abundance indices of some commercially important species appear to have declined (Phycis phycis, Pontinus kuhlii, Conger conger, Beryx splendens and B. decadactylus), while others appear to be more stable (Helicolenus dactylopterus) or even increasing (Mora moro). Although the available data are insufficient for a formal assessment on the status of exploited populations, the long-term analysis of commercial landings and survey data was used as a basis to assess deep sea demersal teleost fisheries of the Azores, under a precautionary approach.

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“…Most studies have compared intraspecific differences in otolith shape either over large distances (>500 km e.g. Vieira et al, 2014), across oceanographic barriers (Tuset et al, 2003) or between habitats (Morat et al, 2014;Vignon & Morat, 2010). It is not yet clear what can be learned from otolith shape at small spatial scales and in the absence of strong oceanographic barriers.…”

Section: Introductionmentioning

confidence: 99%

Size-effect, asymmetry, and small-scale spatial variation in otolith shape of juvenile sole in the Southern North Sea

et al. 2018

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While otolith shape analysis can provide a valuable tool for discriminating between fish populations, factors which may influence otolith shape, such as the effect of size, directional asymmetry in growth, and local environmental conditions, are often unknown. Here, we analyzed differences in otolith shape across three size classes of age-0 common sole Solea solea L. from nursery grounds off the Belgian coast and in the Wadden Sea. Across size classes, form-factor decreased and roundness remained consistently high in both nursery grounds, while ellipticity increased in the Belgian nursery. Directional asymmetry between left and right otoliths measured by Fourier coefficients accounted for 0.96 and 7.2% of the variance when comparing otoliths overall, and for each size class, respectively. Within the Belgian nursery, results were consistent across sampling years and locations. In addition, otolith shape was marginally different between nursery grounds, but highly variable within nursery grounds. A small divergent group, which seems partly related to fish size, was noted at both spatial and temporal scales. Based on these results and before embarking on a study of population structure using otolith shape in age-0 common sole, we recommend testing for directional asymmetry and fish size effects across the entire region of interest.

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Otolith shape analysis as a tool for stock discrimination of forkbeard (Phycis phycis) in the Northeast Atlantic

Cited by 30 publications

References 34 publications

Genetic and Morphological Variation of the Forkbeard, Phycis phycis (Pisces, Phycidae): Evidence of Panmixia and Recent Population Expansion along Its Distribution Area

Genetic and Morphological Variation of the Forkbeard, Phycis phycis (Pisces, Phycidae): Evidence of Panmixia and Recent Population Expansion along Its Distribution Area

Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings

Size-effect, asymmetry, and small-scale spatial variation in otolith shape of juvenile sole in the Southern North Sea

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