Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis
The shape of sagitta otoliths was used to compare individuals of little tunny (<i>Euthynnus alleteratus</i>) harvested on board commercial fishing vessels from the coastal areas along the Eastern Atlantic, including the Mediterranean Sea. Fish sampling and selection was designed to cover...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Fishes |
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| Online Access: | https://www.mdpi.com/2410-3888/8/6/317 |
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| author | Rubén Muñoz-Lechuga Fambaye Ngom Sow Diaha N’Guessan Constance Davy Angueko David Macías Alexia Massa-Gallucci Guelson Batista da Silva Jorge M. S. Gonçalves Pedro G. Lino |
| author_facet | Rubén Muñoz-Lechuga Fambaye Ngom Sow Diaha N’Guessan Constance Davy Angueko David Macías Alexia Massa-Gallucci Guelson Batista da Silva Jorge M. S. Gonçalves Pedro G. Lino |
| author_sort | Rubén Muñoz-Lechuga |
| collection | DOAJ |
| description | The shape of sagitta otoliths was used to compare individuals of little tunny (<i>Euthynnus alleteratus</i>) harvested on board commercial fishing vessels from the coastal areas along the Eastern Atlantic, including the Mediterranean Sea. Fish sampling and selection was designed to cover possible seasonal changes and tuna size. The research encompassed both morphometric and shape analyses of left sagittal otoliths extracted of 504 fish specimens. Four shape indices (Circularity, Roundness, Rectangularity, and Form-Factor) were significantly different between two groups, showing a statistical differentiation between two clear spatial units. The degree of divergence was even more pronounced along the rostrum, postrostrum, and excisura of the generated otolith outlines between these two groups. One group corresponds to the samples from the coastal areas in the Northeast Temperate Atlantic and Mediterranean Sea (NETAM Area) and a second group from the coastal areas off the Eastern Tropical Atlantic coast of Africa (ETA Area). This study is the first to use otolith shape to differentiate tunas from separate spatial units. These results could be used to re-classify previously collected samples and to correct time series of data collected. |
| first_indexed | 2024-03-11T02:29:15Z |
| format | Article |
| id | doaj.art-edbe82dd534f4b34ba171ff8ded71fa1 |
| institution | Directory Open Access Journal |
| issn | 2410-3888 |
| language | English |
| last_indexed | 2024-03-11T02:29:15Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fishes |
| spelling | doaj.art-edbe82dd534f4b34ba171ff8ded71fa12023-11-18T10:22:56ZengMDPI AGFishes2410-38882023-06-018631710.3390/fishes8060317Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape AnalysisRubén Muñoz-Lechuga0Fambaye Ngom Sow1Diaha N’Guessan Constance2Davy Angueko3David Macías4Alexia Massa-Gallucci5Guelson Batista da Silva6Jorge M. S. Gonçalves7Pedro G. Lino8Portuguese Institute for the Ocean and Atmosphere (IPMA), Avenida 5 de Outubro s/n, 8700-305 Olhão, PortugalOceanographic Research Center of Dakar Thiaroye—CRODT/ISRA, LNERV—Route du Front de Terre, Dakar BP 2241, SenegalCenter of Oceanology Research, 29 Rue des Pêcheurs—BP V-18, Abidjan 01, Côte d’IvoireGeneral Directorate of Fisheries and Aquaculture, Libreville BP 9498, Estuaire, GabonSpanish Institute of Oceanography, Oceanographic Center of Málaga, Puerto Pesquero s/n, 29460 Fuengirola, Málaga, SpainAquaBioTech Group Central Complex, Naggar Street, Targa Gap, MST 1761 Mosta, MaltaAnimal Science Department, University Federal Rural of Semiárido, Av. Francisco Mota, 572—Bairro Pres. Costa e Silva, Mossoró CEP 59.625-900, RN, BrazilCCMAR—Centre of Marine Sciences, Campus de Gambelas, University of Algarve, 8005-139 Faro, PortugalPortuguese Institute for the Ocean and Atmosphere (IPMA), Avenida 5 de Outubro s/n, 8700-305 Olhão, PortugalThe shape of sagitta otoliths was used to compare individuals of little tunny (<i>Euthynnus alleteratus</i>) harvested on board commercial fishing vessels from the coastal areas along the Eastern Atlantic, including the Mediterranean Sea. Fish sampling and selection was designed to cover possible seasonal changes and tuna size. The research encompassed both morphometric and shape analyses of left sagittal otoliths extracted of 504 fish specimens. Four shape indices (Circularity, Roundness, Rectangularity, and Form-Factor) were significantly different between two groups, showing a statistical differentiation between two clear spatial units. The degree of divergence was even more pronounced along the rostrum, postrostrum, and excisura of the generated otolith outlines between these two groups. One group corresponds to the samples from the coastal areas in the Northeast Temperate Atlantic and Mediterranean Sea (NETAM Area) and a second group from the coastal areas off the Eastern Tropical Atlantic coast of Africa (ETA Area). This study is the first to use otolith shape to differentiate tunas from separate spatial units. These results could be used to re-classify previously collected samples and to correct time series of data collected.https://www.mdpi.com/2410-3888/8/6/317stock delimitationtunamorphologyfish populationshaper |
| spellingShingle | Rubén Muñoz-Lechuga Fambaye Ngom Sow Diaha N’Guessan Constance Davy Angueko David Macías Alexia Massa-Gallucci Guelson Batista da Silva Jorge M. S. Gonçalves Pedro G. Lino Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis Fishes stock delimitation tuna morphology fish population shaper |
| title | Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis |
| title_full | Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis |
| title_fullStr | Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis |
| title_full_unstemmed | Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis |
| title_short | Differentiation of Spatial Units of Genus <i>Euthynnus</i> from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis |
| title_sort | differentiation of spatial units of genus i euthynnus i from the eastern atlantic and the mediterranean using otolith shape analysis |
| topic | stock delimitation tuna morphology fish population shaper |
| url | https://www.mdpi.com/2410-3888/8/6/317 |
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