Antolínez, A. (Ana)

Dueñas-Liaño, C. (Clara)

Hernández, C. (Carmen)

Villamor, B. (Begoña)

English

Repositorio Institucional Digital del IEO

Problems identification in ageing of otoliths of Anchovy (Engraulis encrasicolus) fromDivisions VIIIcb and IXa North.Dueñas- Liaño, C., Hernandez, C., Antolínez, A., and Villamor, B.WKARA2 [Workshop on Age reading of European anchovy (Engraulis encrasicolus)]28 November -2 December 2016Pasaia (Guipuzcoa, Spain)Age interpretation criteriafollowed by Uriarte et al., (2002 and 2016) and ICES WKARA 2009The method is based on the knowledge of the annual growth pattern of the anchovy otoliths, of the seasonal growth of otolithedge by ages and of the most typical checks.• A set of an opaque and hyaline zone corresponds to an annual growth zone (annulus).• The date of birth is conventionally assumed to be the 1st of January and the fish is assigned to a year class on this basis (if anotolith is collected during the first semester the age group correspond to the number of hyaline zones, if the otolith is collectedfrom a fish caught during the second semester, the hyaline edge will not be considered)• Maximum otolith growth (opaque ring formation) takes place in summer months, and it decreases in winter time (hyaline ringformation). However, in some areas, the starting of the opaque edge during spring time changes with ages, being remarkablysooner at age 1 than at older ages.• Typical annual growth of the otoliths is established, by which annulus width during the first, second and third years of life(corresponding to 0, 1 and 2 years old groups) decreases progressively. Older ages present a rather similar width to the oneexperienced at previous ages.• Typical checks occur before and after the first winter ring is formed, during age 0 and age 1 of anchovy. The checks before thetrue hyaline winter ring are generally present around the nucleus, these checks are named C05 and C08. The most typical ringformed after the first true hyaline ring is formed during June/July in many of the 1 years old anchovy at the peak of their firstspawning period, which is considered to be a spawning check. According to its position in relation to the total expected annualgrowth these checks are named C 12, C15 or C18 if laid down around 50% or 80% of expected annual growth.ICES Sub-division VIIIc EastMarch 16, 2016. nº 11, 155 mm. 2 years old?. Hyaline edgeRings marked on the rostrum and anti-rostrum.Are there annual rings or maybe spawing ring C 15? March 16, 2016. nº 23, 165 mm. 2 years old?. Hyaline edge.Rings marked on the rostrum and anti-rostrum. Of the 1st ring to the base, there is one equidistant.Is it a spawning ring C 15 or other annual ring? and then 3 years oldMarch 16, 2016. nº 71,  162 mm. 2 years old?. Hyaline edge.Rings marked on the rostrum and anti-rostrum. Little estimated growth then false ring: spawning ring C 15VIIIc East2 or 3 years old?March 16, 2016 nº21  161 mm.Hyaline edge2 or 3 years old?• 1st annual triple winter ring + spawing ring C15• 1st annual double winter ring + spawning ring C 15? + 2nd marked annual ring and edge.March 16, 2016. nº32, 153 mm. Hyaline edge. 2 or 3 years old?• 1st annual ring marked and weak spawning ring C 15 + 2º ring + edge• 2nd annual ring marked, because estimated growth or spawning ring C 15 March 16, 2016nº 44 ,157 mm.Hyaline edge. 3 years old• 1st annual winter ring +2nd annual ring + edge.Because esteemed patternof growth.• Why not is it, 2nd ring maybe spawning ring C 18?Is it because large otolithsize ?March 16, 2016. nº 50, 168 mm. Hyaline edge. 2 or 3 years old?•2nd real ring or spawning ring C 18?VIIIc East. 2 or 3 years old?March 16, 2016 nº 89, 172 mmHyaline edge. 3 years old.Good example of annual rings with expected growthMarch 16, 2016. nº 96,  165 mm . Hyaline edge. 2 years oldSpawning ring C 15 because little growth?March 16, 2016.nº 90  163 mmHyaline edge. 3 years old.1st winter ring +weak spawning ring C 12 + 2nd annual ring + edgeMarch 16, 2016.  Nº 51, 161 mm. Hyaline edge. 2 or 3 years old?Spawning ring C 12 or spawning ring C 18?  What does it depend on?VIIIc East2 against 3 years oldMarch 16, 2016.nº 12,  156mmHyanile edge. 2 years old1st annual doble winter ring+ spawning ring C15March 16, 2016. nº 14, 162mm. Hyaline edge. 2 years oldSpawning ring C 15 because, is it little growth for annualring? Or 3 years old?March 16, 2016nº28, 163mmHyaline edge. 2 years old• 1st annual triple winter ring• No 1st + 2nd + 3rd ring independent? March 16, 2016. nº 29, 159mm. Hyaline edge. 2 years old.Spawning ring C 15. Rings marked on the rostrum.VIIIc EastReal or false rings?October. DEMERSALES2016L131, nº38 , 96 mm. 0 year oldCentral check C 08: R1 741,43 µmL129, nº22, 106 mm. 0 year oldCentral check C 08: 790,68 µmL94, nº11, 114 mm. 0 year oldCentral check C 08: 887,66 µmL129, nº12, 104 mm. 1 year oldAlthough small size. Annual ring R1: 907,11 µmL94, nº 3, 116 mm. 1 year oldCentral check C 08: R1 715,58 µmL131, nº 36, 115 mm. 1 year oldAnnual ring : R1 923,48 µmOctober.DEMERSALES2016VIIIc East. False checks previous to the 1sr winter hyaline zone: measureMay 5, 2016. nº32, 139mm2 years old. Spawning ring C 15May 5, 2016. nº 37, 138mm2 years old. Spawning ring C 18May 5, 2016. nº 51, 136mm2 years old. Weak spawning rings C12 and C15May 5, 2016.nº 80, 132mm2 years old. Spawning ring C 12May 5, 2016. nº 55, 138mm2 years old. Spawning ring C 12May 5,2016. nº 76, 139mm2 years old. Weak spawning ring C 12VIIIc East: Common checks appear during the 2nd year of lifeICES DivisionVIIIbApril 25, 2016Nº 23,  132 mm1st annual double winter ring +Spawning check C 15Hyaline edge. 2 years oldApril 25, 2016Nº 93, 133 mm1st annual triple ring of winter +Spawning checks C 15 and C 18Hyaline edge. 2 years oldVIIIb. What rings do we take into account?April 25, 2016Nº28, 138 mm1st annual ring marked +weak spawning ring C 15 +hyaline edge2 years oldApril 25, 2016. nº66, 136 mm. Hyaline edge. 2 years old1st weak annual ring ( R1 1004,44 µm )+ spawning ring C 18April 25, 2016Nº90,  131 mm1st annual double ring +Spawning ring C 12 +Hyaline edge2 years oldApril 25, 2016. Nº 98, 131 mm. Hyaline edge. 1 year old1st  weak annual ring (R1 927,21 µm). We do not count for small size? VIIIb: Common checks appear during the 2nd yearApril 25, 2016Nº 64, 138 mmHyaline edge1 year oldWeak central ringWhen the ring is takenInto account ? April 25, 2016. Nº82 , 128 mm. Hyaline edge1 year old . Weak central ring and little growth ?April 25, 2016Nº 68, 148 mmHyaline edge1 year oldWeak central ringApril 25, 2016. Nº 92, 148 mm. Hyaline edge2 years old.  Weak central check with expected growth ?VIIIb. Little visible ringsWhen do we takeinto account?April 25, 2016 Nº 65, 146 mmSmall opaque edge at bases.1 year old.Weak annual ringApril 20, 2016. Nº 93, 145 mm. Hyaline edge.2 years old. Weak annual ring with expected growthApril 20, 2016Nº 95, 153 mmSmall opaque edge at bases.2 years oldWeak split ringsApril 20, 2016. Nº 100, 138 mm. Hyaline edge. 2 years oldWeak annual ring with expected growthVIIIb. Little visible ringsWhen do we takeinto account?January 20,2016. nº1, 165 mm. Hyaline edge . 2 years old1st annual double winter ring.January 20, 2016. nº 2, 181 mm. Hyaline edge. 2 years oldSpawning ring C 15April 25,2016  Nº 32, 156 mmHyaline edge. Central check C 08: R1 800,90 µm + 1st annual double winter ring + :• 2nd annual ring marked + hyaline edge ? 3 years old• Or spawning ring C 18 + hyalineedge ? 2 years oldApril 25, 2016.Nº 86, 163 mm. Hyaline edge. 3 years old.1st annual winter ring: R1 953,46 µm. Weak spawning ring C 18VIIIbSpecial otolithsto showMay 17, 2016. nº39, 127 mmOpaque edge. 1 year oldApparently winter annualring, but when measuring itsradius: R1 745,82 µmCheck central C 08May 17, 2016. nº 76, 123 mm. 2 years oldWeak check central C 08: R1 743,35 µmMay 17, 2016  nº36, 122 mmOpaque edge.2 years oldSpawning ring C 12May 17, 2016Nº94,  126 mmOpaque edge2 years oldSpawning ring C 15VIIIb. Different typesof checksMay 17, 2016nº 55, 125 mmOpaque edge2 years oldSpawning ring C 15May 17, 2016. nº74, 125 mmHyaline edge. 2 years oldSpawning ring C 15May 17, 2016nº11, 128 mmOpaque edge2 years oldWeak spawning ring C 18May 17, 2016. nº 66, 130 mm. Opaque edge.2 years old. Weak spawning ring C 18VIIIb. Different typesof checksICES Sub-division Ixa NorthMarch 16, 2016 nº 3, 111 mmOpaque edge1 year old1st annual winter ring (R1 1188,35 µm) +Wide spawning ring C 15very markedMarch 16, 2016. nº42, 106 mm. Opaque edge. 1 year old1st annual winter ring (R1 1055,42 µm) + wide doublespawning ring C 15 very markedMarch 16, 2016nº 81, 107 mmOpaque edge.1 year old1st annual winter ring (R1 1147,85 µm) +Spawning ring C 15 verymarkedMarch 16, 2016. Nº 99, 106 mm. Opaque edge. 1 year oldCheck central C 05 ( R1 600,64 µm)  + triple annual winter ringIxa NorthOvermarked checksApril 21, 2016Nº 65, 136 mmOpaque edge1 year oldIs it possible to spawningcheck C 15 more marked than the annualring  (R1 1020,53 µm) ?April 21,2016. nº 66, 140 mm. Opaque edge. 1 year oldSpawning check C 15 more marked than the annual ring (R1 944,27 µm)May 10,2016nº 80,  128 mm Opaque edge1 year oldWeak spawningCheck C 15June 22, 2016. Nº7, 125mm. Hyaline edge. 2 years old1st annual winter ring (R1 974,02 µm) no central checkIxa North Edge typesMarch 16, 2016. Nº 100, 117 mm. 1 year oldWeak spawning C 18 . Opaque edge ?April 21, 2016. Nº 55, 128 mm1 year old. Opaque edge?May 10, 2016.Nº49, 126 mm1 year old. Opaque edge?May 10, 2016. Nº94, 125 mm1 year old. Opaque edge?June 22, 2016. Nº 1, 131 mm2 years old. Hyaline edgeJune 22, 2016Nº 34, 131mm2 years old. Hyaline edgeIxa North. Edge typesMarch 16, 2016. Nº65, 110 mmOpaque edge. 1 year old.Central check C 08 (R1 848,00 µm) + 1st annual triple ringsMarch 16, 2016. Nº78, 112 mmOpaque edge. 1 year old.Central check C 05 ( R1 620,33 µm )+ annual winter ring + spawning check C 18March 16, 2016. Nº79, 110 mm Opaque edge. 1 year old.Central check C 05 (R1 796,90 µm)+1st annual triple ringsMarch 16,2016. Nº 11, 113 mm. Opaque edge1 year old. Central check C 05 (R1 778,85 µm)+ annual winter ring+ spawning check C 15March 16,2016. Nº28, 120 mmOpaque edge. 1 year oldCentral check C 08 (R1 879,42 µm)+ 1st annual double ringsMarch 16,2016. Nº 84, 115 mmOpaque edge. 1 year oldCentral check C 05 (R1 795,44 µm)+ 1st annual double rings+ spawning check C 18March 16, 2016. Nº 29, 137 mmOpaque edge. 1 year old.Central check C 08 (R1 896,57 µm) +Annual winter ringMarch 16, 2016. Nº 91, 117 mm Opaque edge? 1 year old.Central check C 08 (R1 782,91 µm)+Annual winter ring +spawning check C 15April 21, 2016. Nº 60, 128 mmOpaque edge. 1 year old1st annual doble ring or annual ring + spawning check C 15April 21, 2016. Nº 64, 129 mm Opaque edge. 1 year oldCentral check C 08 (R1 797,23 µm)+Annual winter ringApril 21, 2016. Nº 82, 140 mm Opaque edge. 1 year oldSpawning check C 15 more marked thanAnnual ring?April 21, 2016. Nº 83, 144 mmOpaque edge. 1 year old1st annual winter ring + spawning check C 15May 5, 2016. Nº 2, 128 mm Hyaline edge. 2 years old1st multi ring and Weak spawning check C 15May 5, 2016. Nº 3, 140 mmHyaline edge. 2 years oldAnnual double ring or annual winterring + spawning check C 12?May 5, 2016.Nº4, 138 mmHyaline edge. 2 years oldCentral check C 08 (R1 747,89 µm)+Double spawning check C15 or C12+C15?May 5, 2016.Nº 6, 140 mm . Hyaline edge2 years old. 1st annual double ring+Spawning check C 15May 5, 2016.Nº 8, 125 mm Hyaline edge. 2 years old.Spawning check C 15May 5, 2016.Nº 22, 145 mm. Hyaline edge2 years old. Annual winter ring + doublespawning check C 15 or C12 + C15?May 10, 2016. Nº 41,137 mm.Hyaline edge. 2 years oldSpawning check C 15May 10, 2016. Nº42, 150 mmHyaline edge. 2 years oldSpawning check C 12May 10, 2016. Nº44, 140 mmHyaline edge. 2 years oldSpawning check C 15May 10, 2016. Nº47,141 mm Hyaline edge. 2 years oldSpawning check C  15May 10, 2016. Nº 50, 139mm Hyaline edge. 2 years oldSpawning check C 15May 10, 2016. Nº68, 144 mmOpaque edge?  2 or 3 years old?Spawning check C 15 or 2nd annual ring?Thank you

Problems identification in ageing of otoliths of Anchovy (Engraulis encrasicolus) from  Divisions VIIIcb and IXa North

Dueñas-Liaño, Clara

Hernández, Carmen

Antolínez, Ana

Villamor, Begoña

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/handle/10508/11098/Due%c3%b1as_et_al.2016_WKARA2_Otolithproblemsidentification.pdf?sequence=1&isAllowed=y

Problems identification in ageing of otoliths of Anchovy (Engraulis encrasicolus) from Divisions VIIIcb and IXa North

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