Navarro, M.R. (María Rosario)

Silva, Alexandra

Silva, Andreia

Soares, Eduardo

Villamor, B. (Begoña)

English

Silva, A. (Andreia)

Soares, E. (Eduardo)

Silva, A. (Alexandra)

Repositorio Institucional Digital del IEO

Workshop on Age Reading Of Chub Mackerel (Scomber colias) (WKARCM)Lisbon, 02-06 November 2015Problem identification in ageing of otoliths of chub mackerel(Scomber colias) ToR C Andreia V. SilvaMaria Rosario NavarroBegoña VillamorEduardo SoaresAlexandra SilvaAge Range 3-6 yearsImage AnalysisSelection of 124 otoliths 3 sets14 readers Age criteria• For the three sets of otoliths of this exchange the conventional birth date is the1st January.• The spawning period of this species occurs in spring, between March andJune in Iberian waters (Martins, 1996; Navarro et al., 2014).• True annual rings will be those formed in winter each year.Analysis1 - Check the age range for each otolith by setAge Range: 3-6 years2 – Calculate the age difference Age difference: 3 years3 – Count the number of otoliths for each age difference4 – Identify the possible causes of age differences by set50 otoliths images, 1 with 100% of agecoincidencesPROBLEM:Identification of first annual ring Bay Biscay SetNº OTOLITHS with difference agerange of1 2 3 4 > 52 11 14 14 85 years4 yearsPROBLEM: Double rings counts86-Sc-IEO-S-5450 otoliths images, 1 with 100% of agecoincidencesBay Biscay SetNº OTOLITHS with diference agerange of1 2 3 4 > 52 11 14 14 83 years2 years6 years7/8/201635-O-IEO-M-36Mediterranean SetNº OTOLITHS with diferenceage range of1 2 3 4 > 512 25 7 3 1PROBLEM: Double rings counts3 years6 years4 years49 otoliths images, 1 with 100% of agecoincidences7/8/201635-O-IEO-M-36Mediterranean SetNº OTOLITHS with diferenceage range of1 2 3 4 > 512 25 7 3 149 otoliths images, 1 with 100% of agecoincidencesPROBLEM: Edge type identification38-O-IEO-M-193 years2 years35-O-IEO-M-36Mediterranean SetNº OTOLITHS with diferenceage range of1 2 3 4 > 512 25 7 3 1PROBLEM: First annual ring identification38-O-IEO-M-192 years3 years37-O-IEO-M-1849 otoliths images, 1 with 100% of agecoincidencesPortugal SetNº otoliths with number of years diference from modal age equal to: 1 2 3 4 > 53 14 4 3 1PROBLEM: − First ring identification− Edge type25 otoliths images, 0% of age agreement4 years5 years103-Mas MAT101 2011Jan 121-Mas MAT367 2011Jul4 years3 yearsPortugal SetNº otoliths by age difference1 2 3 4 > 53 14 4 3 1PROBLEM:Double rings counts25 otoliths images, 0% of age agreement116-Mas MAT294 2011Mai3 years4 years5 years3-5> years of age diferences- First ring identification;- Double rings counts each as an annual growth ring;- Problem in the interpretation of the otolith growth structure.1-2 years of age diferences- First ring identification (specialy in Bay of Biscay)- Edge type identificationMain Problems

Problem identification in ageing of otoliths of chub mackerel (Scomber colias)

Navarro, María Rosario

Villamor, Begoña

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/10187/1/Silva%20et%20al%202015_AgeProblemsScomberColias_WKARCM.pdf

Problem identification in ageing of otoliths of chub mackerel (Scomber colias)

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Digital.CSIC