Age, growth and utility of otolith morphometrics as a predictor of age in the wrasse Coris julis (Labridae) from the eastern Adriatic Sea


  • Frane Škeljo University of Split, Center of Marine Studies
  • Josipa Ferri University of Split, Center of Marine Studies
  • Jure Brčić University of Split, Center of Marine Studies
  • Mirela Petrić University of Split, Center of Marine Studies
  • Ivan Jardas University of Split, Center of Marine Studies



age, growth, daily rings, otolith morphometrics, Coris julis, Adriatic Sea


Age and growth of Coris julis were determined by examining sagittal otoliths belonging to fish sampled between November 2008 and October 2009 in the eastern Adriatic Sea (north-central Mediterranean Sea). A total of 1102 specimens (528 males, 487 females and 87 individuals of indeterminate sex), ranging from 48 to 222 mm total length were analysed. Ninety-two per cent of the otoliths were readable and 68% of the specimens had two readings in agreement. Counting of daily rings revealed that the second opaque ring represents the first annulus (315.1±27.8 daily rings). The maximum observed age was 7 years for males and 5 years for females, with males dominating in higher age classes ( > 3 years) and females in age classes 1+ and 2+. Growth was described by the von Bertalanffy growth curves and significant differences were found between males (L=29.10 cm, k=0.12 and t0=–1.48) and females (L=21.27 cm, k=0.21 and t0=–1.08). Otolith mass, length, width and thickness were determined for the otoliths belonging to 465 fish and the utility of these morphometrics as a predictor of age was evaluated. The most precise age estimations were obtained from the otolith length data, followed by the otolith mass.


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Araújo J.N., Martins A.S. 2007. Age, growth and mortality of white grunt (Haemulon plumieri) from the central coast of Brazil. Sci. Mar. 71(4): 793-800.

Bagenal T.B., Tesch F.W. 1978. Age and growth. In: Bagenal T.B. (ed.), Methods for assessment of fish production in fresh waters. Oxford Blackwell Scientific Publications, pp. 101-136.

Beamish R.J., Fournier D.A. 1981. A method for comparing the precision of a set of age determinations. Can. J. Fish. Aquat. Sci. 38: 982-983.

Bernard D.R. 1981. Multivariate analysis as a means of comparing growth in fish. Can. J. Fish. Aquat. Sci. 38: 233-236.

Boehlert G.W., Yoklavich M.M. 1998. Variability in age estimates in Sebastes as a function of methodology, different readers and different laboratories. Calif. Fish. Game. 70: 210-224.

Brusle S. 1987. Sex-inversion of the hermaphroditic, protogynous teleost Coris julis L. (Labridae). J. Fish. Biol. 30: 605-616.

Cardinale M., Arrhenius F., Johnsson B. 2000. Potential use of otolith weight for the determination of age structure of Baltic cod (Gadus morhua) and plaice (Pleuronectes platessa). Fish. Res. 45: 239-252.

Cardona L., López D., Sales M., Caralt S., Díez I. 2007. Effects of recreational fishing on three fish species from the Posidonia oceanica meadows off Minorca (Balearic archipelago, western Mediterranean). Sci. Mar. 71(4): 811-820.

Chang W.Y.B. 1982. A statistical method for evaluating the reproducibility of age determination. Can. J. Fish. Aquat. Sci. 39: 1208-1210.

Fischer W., Bauchot M.L., Schneider M. 1987. Fiches FAO d’identification des espèces pour les besoins de la pêche. Méditerranée et mer Noire. FAO, Rome, 1529 pp.

Fontes J., Afonso P., Santos R., Caselle J.E. 2010. Temporal variability of larval growth, size, stage duration and recruitment of a wrasse, Coris julis (Pisces: Labridae), from the Azores. Sci. Mar. 74(4): 721-729.

Fossen I., Albert O.T., Nilssen E.M. 2003. Improving the precision of ageing assessments for long rough dab by using digitised pictures and otolith measurements. Fish. Res. 60: 53-64.

Francis R.I.C.C. 1990. Back-calculation of fish length: a critical review. J. Fish. Biol. 36(6): 883-902.

Gordoa A., Molí B. 1997. Age and growth of the sparids Diplodus vulgaris, D. sargus and D. annularis in adult populations and the differences in their juvenile growth patterns in the north-western Mediterranean Sea. Fish. Res. 33: 123-129.

Gordoa A., Molí B., Raventós N. 2000. Growth performance of four wrasse species on the north-western Mediterranean coast. Fish. Res. 45: 43-50.

Guidetti P. 2004. Consumers of sea urchins, Paracentrotus lividus and Arbacia lixula, in shallow Mediterranean rocky reefs. Helgol. Mar. Res. 58: 110-116.

Gutreuter S. 1987. Considerations for estimation and interpretation of annual growth rates. In: Summerfelt R., Hall G.H. (eds.), The Age and Growth of Fish. The Iowa State University Press, Ames, pp. 209-242.

Hereu B., Zabala M., Linares C., Sala E. 2005. The effects of predator abundance and habitat structural complexity on survival of juvenile sea urchins. Mar. Biol. 146: 293-299.

Jardas I. 1996. Jadranska ihtiofauna. Školska knjiga, Zagreb, 533 pp.

Lloret J., Zaragoza N., Caballero D., Riera V. 2008. Biological and socioeconomic implications of recreational boat fishing for the management of fishery resources in the marine reserve of Cap de Creus (NW Mediterranean). Fish. Res. 91: 252-259.

Morales-Nin B., Moranta J., García C., Tugores M.P., Grau A.M., Riera F., Cerdà M. 2005. The recreational fishery off Majorca Island (western Mediterranean): some implications for coastal resource management. ICES J. Mar. Sci. 62: 727-739.

Pajuelo J.G., Lorenzo J.M., Méndez M., Coca J., Ramos A.G. 2002. Determination of age and growth of the striped seabream Lithognathus mormyrus (Sparidae) in the Canarian archipelago by otolith readings and backcalculation. Sci. Mar. 66(1): 27-32.

Pilling G.M., Grandcourt E.M., Kirkwood G.P. 2003 The utility of otolith weight as a predictor of age in the emperor Lethrinus mahsena and other tropical fish species. Fish. Res. 60: 493-506.

Pino A.C., Cubillos L.A., Araya M., Sepúlveda A. 2004. Otolith weight as an estimator of age in the Patagonian grenadier, Macruronus magellanicus, in central-south Chile. Fish. Res. 66: 145-156.

Radtke R.L., Shafer D.J. 1992. Environmental sensitivity of fish otolith microchemistry. Aust. J. Mar. Freshw. Res. 43: 935-951.

Raventós N., Macpherson E. 2001. Planktonic larval duration and settlement marks on the otoliths of Mediterranean littoral fishes. Mar. Biol. 138: 1115-1120.

Ross J.R., Crosby J.D., Kosa J.T. 2005. Accuracy and precision of age estimation of Crappies. North. Am. J. Fish. Manage. 25: 423-428.

Quignard J.P., Pras A. 1986. Labridae. In: Whitehead P.J.P., Bauchot M.L., Hureau J.C., Nielsen J., Tortonese E. (eds.), Fishes of the north-eastern Atlantic and the Mediterranean. UNESCO, Paris, pp. 919-942.

Schneider W. 1990. FAO species identification sheets for fishery purposes. Field guide to the commercial marine resources of the Gulf of Guinea. FAO, Rome, 268 pp.

Steward C.A., DeMaria K.D., Shenker J.M. 2009. Using otolith morphometrics to quickly and inexpensively predict age in the gray angelfish (Pomacanthus arcuatus). Fish. Res. 99: 123-129.

Victor B.C. 1982. Daily otolith increments in two coral-reef wrasses, Thalassoma bifasciatum and Halichoeres bivittatus. Mar. Biol. 71: 203-208.

Worthington D.G., Fowler A.J., Doherty P.J. 1995. Determining the most efficient method of age determination for estimating the age structure of a fish population. Can. J. Fish. Aquat. Sci. 52: 2320-2326.




How to Cite

Škeljo F, Ferri J, Brčić J, Petrić M, Jardas I. Age, growth and utility of otolith morphometrics as a predictor of age in the wrasse Coris julis (Labridae) from the eastern Adriatic Sea. scimar [Internet]. 2012Sep.30 [cited 2023Dec.10];76(3):587-95. Available from: