Discriminating bluemouth, Helicolenus dactylopterus (Pisces: Sebastidae), stocks in Portuguese waters by means of otolith shape analysis

2010 ◽  
Vol 91 (6) ◽  
pp. 1237-1242 ◽  
Author(s):  
Ana Neves ◽  
Vera Sequeira ◽  
Inês Farias ◽  
Ana Rita Vieira ◽  
Rafaela Paiva ◽  
...  
Keyword(s):  
Shape Analysis ◽  
Stock Structure ◽  
Elliptic Fourier Analysis ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Mainland Portugal ◽  
Two Factors ◽  
Helicolenus Dactylopterus ◽  
Elliptic Fourier Descriptors ◽  
Stock Differentiation

The understanding of the stock structure of a species is essential to effectively manage fisheries. Otolith shape analysis has been successfully applied in stock identification using the elliptic Fourier analysis. This method was used to assess possible differences in the otolith shape of Helicolenus dactylopterus caught around the Azores, Madeira and mainland Portugal. A total of 294 individuals ranging from 23 to 29 cm in total length, equally distributed by sex and area, were analysed. The multivariate analysis of variance performed on the otolith normalized elliptic Fourier descriptors (NEFDs) revealed significant differences for both area and sex, but no interaction was found between the two factors. In the canonical discriminant analysis an overall classification success of 69.4% and 66.7% was achieved for females and males respectively. These results suggest the usefulness of otolith shape analysis for stock differentiation of bluemouth from Portuguese waters.

Insights on stock structure of round sardinella Sardinella aurita off north-west Africa based on otolith shape analysis

2016 ◽  
Vol 89 (4) ◽  
pp. 2153-2166 ◽  
Author(s):  
M. Bacha ◽  
A. M. Jeyid ◽  
S. Jaafour ◽  
A. Yahyaoui ◽  
M. Diop ◽  
...  
Keyword(s):  
West Africa ◽  
Shape Analysis ◽  
Stock Structure ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
North West ◽  
Sardinella Aurita

scholarly journals Southern flounder (Paralichthys lethostigma) stock structure inferred from otolith shape analysis

2014 ◽  
Vol 112 (4) ◽  
pp. 326-338 ◽  
Author(s):  
Stephen R. Midway ◽  
Steven X. Cadrin ◽  
Frederick S. Scharf
Keyword(s):  
Shape Analysis ◽  
Stock Structure ◽  
Paralichthys Lethostigma ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Southern Flounder

scholarly journals Identifying blue whiting (Micromesistius poutassou) stock structure in the Northeast Atlantic by otolith shape analysis

2016 ◽  
Vol 73 (9) ◽  
pp. 1363-1371 ◽  
Author(s):  
Kélig Mahe ◽  
Clémence Oudard ◽  
Tiphaine Mille ◽  
James Keating ◽  
Patricia Gonçalves ◽  
...  
Keyword(s):  
Shape Analysis ◽  
Central Area ◽  
Fish Population ◽  
Stock Structure ◽  
Linear Discriminant ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Northeast Atlantic ◽  
Blue Whiting ◽  
Mature Fish

Information on stock identification and spatial stock structure provide a basis for understanding fish population dynamics and improving fisheries management. In this study, otolith shape analysis was used to study the stock structure of blue whiting (Micromesistius poutassou) in the northeast Atlantic using 1693 samples from mature fish collected between 37°N and 75°N and 20°W and 25°E. The results indicated two stocks located north and south of ICES Divisions VIa and VIb (54°5N to 60°5N, 4°W to 11°W). The central area corresponds to the spawning area west of Scotland. Sampling year effects and misclassification in the linear discriminant analysis suggested exchanges between the northern and southern stocks. The results corroborate previous studies indicating a structuring of the blue whiting stock into two stocks, with some degree of mixing in the central overlap area.

Population structure of the European sardine Sardina pilchardus from Atlantic and Mediterranean waters based on otolith shape analysis

2021 ◽  
Vol 243 ◽  
pp. 106050
Author(s):  
João Neves ◽  
Alexandra Almeida Silva ◽  
Ana Moreno ◽  
Ana Veríssimo ◽  
António Múrias Santos ◽  
...  
Keyword(s):  
Population Structure ◽  
Shape Analysis ◽  
Sardina Pilchardus ◽  
Otolith Shape ◽  
Otolith Shape Analysis

Otolith shape analysis and daily increment validation during ontogeny of larval and juvenile European chub Squalius cephalus

2019 ◽  
Vol 95 (2) ◽  
pp. 444-452
Author(s):  
Bernadette Bounket ◽  
Pierre Gibert ◽  
Vincent Gennotte ◽  
Christine Argillier ◽  
Georges Carrel ◽  
...  
Keyword(s):  
Shape Analysis ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Daily Increment ◽  
European Chub ◽  
Squalius Cephalus

scholarly journals Identification of fish families and species from the western Arabian Gulf by otolith shape analysis and factors affecting the identification process

2019 ◽  
Vol 70 (12) ◽  
pp. 1818 ◽  
Author(s):  
Yu-Jia Lin ◽  
Khaled Al-Abdulkader
Keyword(s):  
Shape Analysis ◽  
Arabian Gulf ◽  
Correct Prediction ◽  
Sample Sizes ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Identification Process ◽  
Prediction Rate ◽  
Candidate Species ◽  
Sampling Procedures

Otolith shape analysis was used to identify 16 fish species belong to 5 families from the western Arabian Gulf to construct a cost-effective method of delineating fish taxonomic groups. We further tested the factors potentially affecting the identification process, including using different dataset sources, sex, the number of candidate species, different sample sizes and different sampling procedures. No specific dataset outperformed any other in the identification of fish families and species. Using all data sources yielded the best performance. Otolith shape parameters were significantly affected by somatic length, but not by sex. The correct prediction rate declined as the number of candidate species increased. An insufficient sample size led to a reduction in correct prediction rates with increased variability. The effects of size-biased sampling were species specific and could greatly reduce the correct prediction rate if the species of interest exhibits strong allometric changes in otolith shape. Having multiple sources of data, information a priori to reduce the number of candidate species and sufficiently large sample sizes across wide size classes so as to include possible variations in otolith shape are key to the precise identification of fish families and species using otolith shape analysis.

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