Jurado-Ruzafa, A. (Alba)

Santamaría, M.T.G. (María Teresa García)

English

Repositorio Institucional Digital del IEO

Growth studies based on otoliths of Trachurus picturatus- Indirect validation and challenges-Alba Jurado-Ruzafa and Teresa G. SantamaríaInstituto Español de OceanografíaCentro Oceanográfico de CanariasWKARHOM 3 - Workshop on Age reading of horse mackerel, Mediterranean horse mackerel and Blue jack mackerel (Trachurus trachurus, T. mediterraneus and T. picturatus)0102030400 1 2 3 4 5 6 7TL (cm)  Growth parametersArea Reference Method Sex N Length Linf (cm) k (years-1) t0 (years) R² Azores Isidro (1990) ML Total 516 FL 52.9 0.2 -0.23 n.a.Westhaus-Ekau and Ekau (1982) DR Total n.a. TL 51.1 0.144 -1.584 n.a.Garcia et al. (2015) DR Total 1420 FL 58.3 0.09 -2.67 n.a.♂ 628 FL 64.4 0.07 -3.34 n.a.♀ 489 FL 62.1 0.08 -3.11 n.a.BC Total 796 FL 52.9 0.11 -2.45 n.a.♂ 391 FL 60.2 0.08 -2.78 n.a.♀ 320 FL 51.4 0.12 -2.18 n.a.Madeira Jesus (1992) ML Total 489 TL 44.3 0.316 n.d. 0.93 Pereira (1993) ML Total 877 TL 43.8 0.23 -0.57 0.97 Vasconcelos et al. (2006) DR Total 578 TL 42.3 0.161 -2.563 0.74 ♂ 248 TL 39.6 0.194 -2.282 0.72 ♀ 295 TL 49.8 0.114 -3.052 0.75 BC Total 229 TL 48.3 0.135 -2.898 0.99 ♂ 89 TL 44.8 0.143 -3.207 0.99 ♀ 131 TL 44.6 0.163 -2.43 0.99 Vasconcelos et al. (2008) ML Total 889 TL 36.0 0.254 -1.445 0.99 ♂ 391 TL 38.4 0.197 -1.994 0.99 ♀ 454 TL 32.1 0.384 -0.764 0.99 Canary Islands Jurado-Ruzafa andSantamaria (in press)DR Total ♂♀913695625TL TL TL 34.9 42.1 38.4 0.214 0.141 0.169 -2.545-3.038-2.8350.87 0.87 0.87 Mediterranean Sea Casaponsa (1993) n.a. Total n.a. TL 32.2 0.228 -1.469 n.d.Cefali et al. (2004) n.a. Total 875 FL 38.8 0.22 -1.79 n.d.Distribution and growth studiesFishbase(2018)WKARHOM 3 - Livorno (Italy), 5-9 November 2018T. picturatus Otolith deposition - Indirect validationWKARHOM 3 - Livorno (Italy), 5-9 November 2018Azores – Garcia et al. (2015)T. picturatus Otolith deposition - Indirect validationNotes:• No validation of thecoherency of the ageingcriteria.• Maximum assigned age: 18years (FL=50.7cm)!• Partial radii measurementsare not provided in thepaper.Indirect methodDeposition periodicityof one annulusMarginal increment ratio (MIR)Mean monthly evolutionof the marginal increment:MIR = (Ro-rn)/RoWKARHOM 3 - Livorno (Italy), 5-9 November 2018Madeira – Vasconcelos et al. (2006)T. picturatus Otolith deposition - Indirect validationNotes:• Validation of the coherencyin the ageing criteria: partialradii measurement.• Partial radii measurementsare not provided in thepaper.Deposition periodicityof one annulusNot addressedWKARHOM 3 - Livorno (Italy), 5-9 November 2018Canary Islands – Jurado-Ruzafa & Santamaría (in press)T. picturatus Otolith deposition - Indirect validationNotes:• Validation of the agedetermination: partial radiimeasurement.• Partial radii provided in thepaper.Qualitative: monthly % opaque edge – condition factor (Kn)Quantitative: mean monthlymarginal translucent widthAnnulus radius (mm)i ii iii iv v vi2.42 2.89 3.18 3.42 3.57 3.77Indirect methodDeposition periodicityof one annulusr1r2r3=RoWKARHOM 3 - Livorno (Italy), 5-9 November 2018ConclusionsT. picturatusChallenges:• Direct age validation: studies of daily deposition. Annual deposition of one ring has been indirectly proved : 1 year – 1 annulus. The adopted ageing criteria for the species are coherent based on the resultsof the obtained annuli partial radii.• Structure of the population in the EasternAtlantic Ocean.THANK YOU FOR YOUR ATTENTION

Growth studies based on otoliths of Trachurus picturatus – Indirect validation and challenges –

Jurado-Ruzafa, Alba

Santamaría, María Teresa García

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/13654/1/24713.pdf

Growth studies based on otoliths of Trachurus picturatus – Indirect validation and challenges –

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