Navarro-Rodríguez, M.R. (María Rosario)

Silva, A. (Alexandra)

Silva, A. (Andreia)

Soares, E. (Eduardo)

Villamor, B. (Begoña)

English

Navarro-Rosado, M.J. (María José)

Repositorio Institucional Digital del IEO

Small Exchange of Scomber colias Otoliths Programme From Atlantic and Mediterranean areas. Coordinated by María Rosario Navarro*, Andreia Silva**,  Begoña Villamor*, Alexandra Silva** and Eduardo Soares** March 2015 – June 2015  *Instituto Español de Oceanografía (IEO). Centro Oceanográfico de Santander. Promontorio de San Martín, s/n, 39004 Santander, Spain. **Instituto Português do Mar e da Atmosfera (IPMA). Av. Brasilia, 1449-006 Lisboa, Portugal.  1 – INTRODUCTION Following a recommendation of the Planning Group on Commercial Catches, Discards and Biological Sampling (PGCCDBS) in 2011, an exchange of chub mackerel otoliths was carried out in 2012-2013 to assess difficulties in age reading, provide a first evaluation of the agreement, precision and accuracy of age determination. Five age readers from Portugal and Spain participated in the exchange. A total of 244 otoliths were examined, collected in 2011 off the ICES areas VIIIc, IXa and in Western Mediterranean (Martins et al., 2014). The Planning Group on Commercial Catch, Discards and Biological Sampling (PGCCDBS) meeting in February 2014, recommended a Worshop to discuss the results of this exchange and the development of validation studies in this species. This Workshop on Age Reading of Chub Mackerel (Scomber colias) [WKARCM], chaired by Andreia Silva, Portugal, and Maria Rosario Navarro, Spain, will be held in Lisbon, Portugal, the 2-6 of November, 2015. However, due to the time passed since the exchange took place and a renovation of the readers of this species (retirements and new incorporations), it was thought necessary to carry out a new otolith exchange before the start of the Workshop. As the time available to carry out the new exchange is so short, it was decided to use a selection of 150 otolith images from the previous exchange. This Small Exchange of Scomber colias otolith images will be held via WebGr between March and June 2015.    2-OBJECTIVES The exchange will have the following objectives: 1- Evaluate the current precision in otolith age reading of chub mackerel among readers of fishery and surveys samples throughout the year. 2- Identify major difficulties in chub mackerel otolith interpretation for age determinations concerning observed disagreements (e.g. identification of true rings or checks). 3- Report results to the Workshop on Age Reading of Chub Mackerel (Scomber colias) [WKARCM] that will take place in November 2015.   3- MATERIAL AND METHODS  3.1 SETS OF OTOLITHS: The adopted sets of otoliths are shown in Table 1. They are a selection of 150 images from the three sets of the previous exchange (50 images selected from each set).   3.2 PARTICIPANTS AND QUALIFICATION OF READERS: A list with the participants is shown in Table 2, with a summary of their experience in the age determination of Scomber colias, as well as other species, and with the information about their area of expertise. Readers were ranked as High, Medium and Low level considering the number of otoliths (first) and the number of years of experience  (second) with this species. It was considered that an expert reader (High level) should be those with an experience aging at least 10000 otoliths, Readers with a Medium level should be those with an experience ageing between 2000-10000 otoliths, being readers with a Low level those with an experience  ageing less than 2000 otoliths. As no reader had an experience with 10000 or more otoliths, it was considered the participants to be ranked as Medium and Low levels. A summary with the readers experience scale is shown in Table 3.    Table 1. Set of otoliths used in the Small Exchange of Scomber colias Otoliths.            Nº images Months Nº images MonthsIEO - Murcia (Spain) GSA06, Western Mediterranean 24 January, March, April 26 July, November, December 18-39 cmIEO - Santander (Spain) VIIIcE, Bay of Biscay 25 January, March, April, June 25 August - November 27-39 cmIPMA (Portugal) IXa, Portugal waters 23 January-May 27 July, October 17-39 cmInstitute providing data Areas Length rate72 78150Total imagesNº images by set and monthFist half of the year Second half of the yearTable 2. Participants of the Small Eschange of Scomber colias Otoliths.  High/Medium/LowYearsNo. Of otolithsSpecies YearsNo. Of otolithsRosario (Charo) Navarro charo.navarro@st.ieo.es Yes - WKARCM Co-chair Medium 2011-2014 5000Atlantic mackerel          Anchovy2007-2014     2008-2012> 20000                        > 10000Begoña Villamor begona.villamor@st.ieo.es No - Coordinator - - -Clara Dueñas clara.duenas@st.ieo.es Yes Low-0Horse mackerel                        Anchovy                                   Atlantic mackerel2007-2014            2007-2014               2007-2011> 20000                               > 15000                          > 10000Ana Antolínez ana.antolinez@st.ieo.es Yes Low-0Anchovy                          Horse mackerel      Atlantic mackerel1 year                          1 year                         1 year300                       600                 700Andreia V. Silva avsilva@ipma.pt Yes - WKARCM Co-chair Low 2013-2014 900 Atlantic sardine Anchovy2010-2014            2013-2014> 10000                        500Alexandra Silva asilva@ipma.pt No - Coordinator - - -Eduardo Soares esoares@ipma.pt Yes – Coordinator Low - 0Atlantic sardine          Anchovy1990-2014            2011-2014Sandra Dores sdores@ipma.pt yes Low - 0 Merlucius merlucius 2004-2014 > 20000Dina Silva dsilva@ipma.pt yes Low - 0 Trisopterus luscus 2014 > 1000Delfina Morais dmorais@ipma.pt yes Low 2013-2014 1000 Atlanctic sardine 2000-2014 >20000Maria João Ferreira mjferreira@ipma.pt Yes Low - 0 Trachurus spp 2000-2014 > 200001000Hake, red mullet, stripped red mullet, anchovy, sardine, horse mackerel, Atlantic mackerel, Mediterranean horse Mackerel, anglerfish2006-2014 >30000Andrea Massaro andreamassaro@live.it Yes Low 2013-2014 100Hake, red mullet, stripped red mullet, horse mackerel, Atlantic mackerel, Mediterranean horse Mackerel, common sole2011 8000Carbonara Pierluigi carbonara@coispa.it Yes Low 2010-20142010-20142010-2015600030002013-2015 800 Scomber scombrus 2013-2014 2002011-2014 20002011-2015 2000mackerel                        blue whitingFisheries Research Institute (FRI)                                                               64007 Nea Peramos Kavala,                                                                                         GreeceAthanasios Spetsiotis aspetsiotis@inale.gr Yes LowTrachurus picturatus                             Sardina pilchardus2005-2006         2010-2011>3000              >2000Instituto Español de Oceanografia (IEO)                                                Calle Varadero, Nº1                                                                                                30740 San Pedro del Pinatar (Murcia)                                                                           Spain Encarnación García encarnacion.garcia@mu.ieo.es Yes Medium2005-2011mackerel                       blue whiting                      sardineMiguel Vivas miguel.vivas@mu.ieo.es Yes MediumMediterraneanCOISPA Tecnologia & Ricerca - Stazione Sperimentale per lo Studio delle Risorse del Mare,                                                                                                                        Via dei Trulli 18/20.                                                                                                                          70126 Bari - Torre a Mare                                                                                                     ItalyPortugal-IPMAInstituto Português do Mar e Atmosfera (IPMA)                                       Avenida de Brasilia, 1449-006 Lisbon,                                                                PortugalICES IXaSpain-IEO                                       (C.O. Tenerife)Instituto Español de Oceanografia (IEO)                                               Dársena Pesquera, Pcl. 8                                                                                        38180 S/C Tenerife (Canary Islands)                                                  SpainCECAF-Canary Islands                    CECAF-MauritaniaItaly-COISPAGreece-FRIAegena Sea,                                                                  eastern Mediterranean Sea,                                          GFCM sub-area 22Alba Jurado Ruzafa alba.jurado@ca.ieo.es Yes Medium 2000Italy-CIBMCIBM, Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Vialen N. Sauro, 4                                    57128 Livorno,                                                                                        ItalyFAO-GSA: 10, 18, 19FAO-GSA: 9Age reading expertise level                                         Chub mackerelAge reading expertise level                                         Other species Chub mackerel Stock/Area of expertiseSpain-IEO                                       (C.O. Santander)Instituto Español de Oceanografia (IEO)                                                Promontorio de San Martin, s/n                                                                                        39004 Santander (Cantabria)                                                                           SpainBay of Biscay (ICES Subarea VIII) +  ICES IXaNCountry Institute & postal address Participants in workshop Email Readers or Not ?Spain-IEO                                                   (C.O. Murcia)Table 3. Summary of readers and their experience in Scomber colias otoliths age reading.  READER EMAIL EXPERIENCE, YEARS EXPERIENCE, Nº OTOLITHS EXPERTISE LEVELRosario (Charo) Navarro charo.navarro@st.ieo.es 2011-2014 5000 MediumAlba Jurado alba.jurado@ca.ieo.es 2005-2011 2000 MediumEncarnación García encarnacion.garcia@mu.ieo.es 2011-2014 2000 MediumMiguel Vivas miguel.vivas@mu.ieo.es 2011-2014 2000 MediumPierluigi Carbonara carbonara@coispa.it 2010-2014 1000 LowDelfina Morais dmorais@ipma.pt 2013-2014 1000 LowAndreia Silva avsilva@ipma.pt 2013-2014 900 LowAthanasios Spetsiotis aspetsiotis@inale.gr 2013-2014 800 LowAndrea Massaro andreamassaro@live.it 2013-2014 100 LowEduardo Soares esoares@ipma.pt 0 LowSandra Dores sdores@ipma.pt 0 LowDina Silva dsilva@ipma.pt 0 LowMaria João Ferreira mjferreira@impa.pt 0 LowClara Dueñas clara.duenas@st.ieo.es 0 LowAna Antolínez ana.antolinez@st.ieo.es 0 Low3.4 AGE DETERMINATION PROCEDURES WebGR will be used for the determination of the age and growth rings. See WebGR Workshop User’s Manual for details about the use of WebGR. Readers should indicate the annual age determination and position of the winter rings supporting his/her interpretation of the age. Checks or false rings should not be marked, thought if present they could be mentioned in the remark field of the reading.  Minimum knowledge for age determination: Age reading should be made preferably without consulting the length of the fish, based on the otolith examination according to the date of capture and general knowledge of the seasonal otolith growth pattern during the year and being aware of the conventional birth date. · For the three sets of otoliths of this exchange, the conventional birth date is 1st January. · The spawning period of this species occurs in spring, between March and June in Iberian waters (Martins, 1996; Navarro et al., 2014) · True annual rings will be those formed in winter each year. Checks or false rings may be present throughout the year and cause problems in age determination.  4. DATA ANALYSIS  A standard statistical analysis will be used to investigate the age interpretation among readers using the GussEltink spreadsheet (Eltink, 2000). Precision will be estimated by the coefficient of variation (CV) of annuli counting between the different readers. Relative bias and percentage agreement between readers, and modal age, as well as an overall estimate for percentage agreement will be performed.  5. AGENDA FOR THE EXCHANGE OF OTOLITHS The exchange will start in March of 2015 and will end by 16th June.     REFERENCES Eltink, A.T.G.W. 2000. Age Reading Comparisons (MS Excel Workbook version 1.0 October 2000). http://www.efan.no   ICES 2011.Report of the Planning Group on Commercial Catches, Discards and Biological Sampling (ICES PGCCDBS).ICES CM 2011/ACOM:40 ICES 2014. Report of the Planning Group on Commercial Catches, Discards and Biological Sampling (ICES PGCCDBS). ICES CM 2014/ACOM:34 Martins, M.M. 1996. New biological data on growth and maturity of Spanish Mackerel (Scomberjaponicus) off the Portuguese coast (ICES Division IXa). ICES. PelagicFishCommettee. C.M. 1996/H:23. Martins, M.M.; Silva, A.; Navarro, M.R.; Vivas, M.; Rodríguez, E.; Morais, D.; Villamor, B. 2014. Report of chub mackerel (Scombercolias, Gmelin 1798) otolith exchange 2012-2013. Working Document to the ICES Planning Group on Commercial Catches, Discards and Biological Sampling [PGCCDBS], Horta (Azores), Portugal from the 17th–21st of February 2014. ICES CM 2014/ACOM: 34. Navarro, M.R.; Villamor, B.; Landa, J.; Hernández, C. 2014. Reproductive characteristics and body condition of chub mackerel (Scomber colias) in the south of Bay of Biscay, 2011-2013. ISOBAY14 – XIV International Symposium on Oceanography of the Bay of Biscay. DOI: 10.13140/2.1.3620.3841. 

Small Exchange of Scomber colias Otoliths Programme from Atlantic and Mediterranean areas

Navarro-Rosado, María José

Silva, Andreia

Villamor, Begoña

Silva, Alexandra

Soares, Eduardo

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/9491/1/Navarro%20et%20al_Small%20Exchange%20of%20Scomber%20colias%20Otoliths%20Programme.pdf

Small Exchange of Scomber colias Otoliths Programme from Atlantic and Mediterranean areas

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