Scientia Marina, Vol 83, No S1 (2019)

Explorative analysis on red mullet (Mullus barbatus) ageing data variability in the Mediterranean


https://doi.org/10.3989/scimar.04999.19A

Pierluigi Carbonara
COISPA Tecnologia and Ricerca, Stazione Sperimentale per lo Studio delle Risorse del Mare, Italy
orcid https://orcid.org/0000-0002-2529-2535

Walter Zupa
COISPA Tecnologia and Ricerca, Stazione Sperimentale per lo Studio delle Risorse del Mare, Italy
orcid https://orcid.org/0000-0002-2058-8652

Aikaterini Anastasopoulou
Hellenic Centre for Marine Research, Greece
orcid https://orcid.org/0000-0003-0872-6984

Andrea Bellodi
Department of Life and Environmental Sciences, University of Cagliari, Italy
orcid https://orcid.org/0000-0002-9017-1692

Isabella Bitetto
COISPA Tecnologia and Ricerca, Stazione Sperimentale per lo Studio delle Risorse del Mare, Italy
orcid https://orcid.org/0000-0002-8497-1642

Charis Charilaou
Department of Fisheries and Marine Research, Ministry of Agriculture, Rural Development and Environment, Cyprus
orcid https://orcid.org/0000-0002-5510-7265

Archontia Chatzispyrou
Hellenic Centre for Marine Research, Greece
orcid https://orcid.org/0000-0003-1603-8524

Romain Elleboode
French Research Institute for Exploitation of the Sea (Ifremer), France
orcid https://orcid.org/0000-0001-9084-0895

Antonio Esteban
Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Murcia, Spain
orcid https://orcid.org/0000-0002-2896-7972

Maria Cristina Follesa
Department of Life and Environmental Sciences, University of Cagliari, Italy
orcid https://orcid.org/0000-0001-8320-9974

Igor Isajlovic
Institute of Oceanography and Fisheries Split, Croatia
orcid https://orcid.org/0000-0001-7101-9575

Angélique Jadaud
MARBEC, Ifremer, Univ Montpellier, CNRS, France
orcid http://orcid.org/0000-0001-6858-3570

Cristina García-Ruiz
Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain
orcid https://orcid.org/0000-0003-2767-4200

Amalia Giannakaki
Hellenic Center for Marine Research, Institute of Marine Biological Resources and Inland Waters, Greece
orcid https://orcid.org/0000-0001-5436-991X

Beatriz Guijarro
Intituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Spain
orcid https://orcid.org/0000-0002-2083-4681

Sotiris Elias Kiparissis
Hellenic Agricultural Organization-DEMETER, Fisheries Research Institute of Kavala, Greece
orcid https://orcid.org/0000-0002-0587-8889

Alessandro Ligas
Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Italy
orcid https://orcid.org/0000-0003-1036-3553

Kelig Mahé
French Research Institute for Exploitation of the Sea (Ifremer), France
orcid https://orcid.org/0000-0002-6506-211X

Andrea Massaro
APLYSIA, Italy
orcid https://orcid.org/0000-0001-9224-3883

Damir Medvesek
Institute of Oceanography and Fisheries Split, Croatia
orcid https://orcid.org/0000-0002-3869-8550

Chryssi Mytilineou
Hellenic Centre for Marine Research, Greece
orcid https://orcid.org/0000-0002-9326-1650

Francesc Ordines
Intituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Spain
orcid https://orcid.org/0000-0002-2456-2214

Paola Pesci
Department of Life and Environmental Sciences, University of Cagliari, Italy
orcid https://orcid.org/0000-0002-9066-8076

Cristina Porcu
Department of Life and Environmental Sciences, University of Cagliari, Italy
orcid https://orcid.org/0000-0003-2649-6502

Panagiota Peristeraki
Hellenic Center for Marine Research - University of Crete, Biology Department, Greece
orcid https://orcid.org/0000-0002-8608-078X

Ioannis Thasitis
Department of Fisheries and Marine Research, Ministry of Agriculture, Rural Development and Environment, Cyprus
orcid https://orcid.org/0000-0002-0940-2212

Pedro Torres
Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Málaga, Spain
orcid https://orcid.org/0000-0002-7076-6023

Maria Teresa Spedicato
COISPA Tecnologia and Ricerca, Stazione Sperimentale per lo Studio delle Risorse del Mare, Italy
orcid https://orcid.org/0000-0001-9939-9426

Angelo Tursi
University of Bari Aldo Moro (UNIBA), Department of Biology, Spain
orcid https://orcid.org/0000-0002-7776-2738

Letizia Sion
University of Bari Aldo Moro (UNIBA), Department of Biology, Italy
orcid https://orcid.org/0000-0002-0308-1841

Abstract


The uncertainty in age estimation by otolith reading may be at the root of the large variability in red mullet (Mullus barbatus) growth models in the Mediterranean. In the MEDITS survey, red mullet age data are produced following the same sampling protocol and otolith reading methodology. However, ageing is assigned using different interpretation schemes, including variations in theoretical birthdate and number of false rings considered, in addition to differences in the experience level of readers. The present work analysed the influence of these variations and the geographical location of sampling on red mullet ageing using a multivariate approach (principal component analysis). Reader experience was the most important parameter correlated with the variability. The number of rings considered false showed a significant effect on the variability in the first age groups but had less influence on the older ones. The effect of the theoretical birthdate was low in all age groups. Geographical location had a significant influence, with longitude showing greater effects than latitude. In light of these results, workshops, exchanges and the adoption of a common ageing protocol based on age validation studies are considered fundamental tools for improving precision in red mullet ageing.

Keywords


Mullus barbatus; age variability; MEDITS; Mediterranean; reader effect; false rings; date of birth

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