A web-based environment for shape analysis of fish otoliths. The AFORO database


  • Antoni Lombarte Institut de Ciències del Mar (CMIMA-CSIC), Barcelona
  • Òscar Chic Institut de Ciències del Mar (CMIMA-CSIC), Barcelona
  • Vicenç Parisi-Baradad Departament d’Enginyeria Electrònica, Universitat Politècnica de Catalunya (UPC), Barcelona
  • Roger Olivella Institut de Ciències del Mar (CMIMA-CSIC), Barcelona
  • Jaume Piera Unitat de Tecnologia Marina (CMIMA-CSIC), Barcelona
  • Emilio García-Ladona Institut de Ciències del Mar (CMIMA-CSIC), Barcelona




otolith, shape analysis, Curvature Scale Space, Wavelets, Fourier


We present an automatic system for describing and identifying fish otolith shapes combining information technologies with modern advances in signal analysis. As a major novelty with respect to past studies the system includes wavelets (WT) and curvature space scale (CSS) analyses that have been shown to provide local morphologic information and characteristics (landmarks) of the sagitta otolith outline for non-specialists. By applying this electronic catalogue directly the system is very helpful for determining teleostean fish size, population and species. Both the electronic catalogue and the shape analysis are implemented through the AFORO database, which at present contains more than 1250 high resolution images of the left sagitta from 292 species and 94 families of teleostan fishes sampled mainly in Mediterranean and Antarctic waters.


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Bird, J.L., D.T. Eppler and D.M. Checkley. – 1986. Comparison of herring otoliths using Fourier series shape analyses. Can. J. Fish. Aquat. Sci., 43: 1228-1234.

Campana, S.E. and J.M. Casselman. – 1993. Stock discrimination using otolith shape analysis. Can. J. Fish. Aquat. Sci., 50: 1062-1083.

Cardinale, M., P. Doering-Arjes, M. Kastowsky and H. Mosegaard.– 2004. Effects of sex, stock, and environment on the shape of known-age Atlantic cod (Gadus morhua) otoliths. Can. J. Fish. Aquat. Sci., 61: 158-167. doi:10.1139/f03-151

Castonguay, M., P. Simard, and P. Gagnon. – 1991. Usefulness of Fourier analysis of otolith shape for Atlantic mackerel (Scomber scombrus) stock discrimination. Can. J. Fish. Aquat. Sci., 48 : 296-302. doi:10.1139/f91-041

Fitch, J.E. and R.L. Brownell. – 1968. Fish otoliths in cetacean stomachs and their importance in interpreting feeding habits. J. Fish. Res. Bd Can., 25: 2561-2574.

Lombarte, A. and A. Castellón. – 1991. Interespecific and intraspecific otolith variability in the genus Merluccius as determined by image analysis. Can. J. Zool., 69: 2442-2449. doi:10.1139/z91-343

Lombarte, A., G.J. Torres and B. Morales-Nin. – 2003. Specific Merluccius otolith growth patterns related to phylogenetics and environmental. J. Mar. Biol. Ass. U.K., 83: 277-281. doi:10.1017/S0025315403007070h

Mallat, S. – 1991. Zero crossings of a wavelet transform. IEEE Trans. Inform. Theory, 37: 1019-1033. doi:10.1109/18.86995

Mokhtarian, F. and A.K. Mackworth. – 1992. A Theory of Multi-Scale, Curvature-Based Shape Representation for Planar Curves. IEEE Trans. Pattern Analysis Mach. Intellig., 14 : 789-805. doi:10.1109/34.149591

Morales-Nin, B. – 2000. Review of the growth regulation processes of otolith daily increment formation. Fish. Res., 46: 53-67. doi:10.1016/S0165-7836(00)00133-8

Morales-Nin, B., A. Lombarte and B. Japón. – 1998. Approaches to otolith age determination: image signal treatment and age attribution. Sci. Mar., 62: 247-256.

Nolf, D. – 1985. Otolith piscium. In: H.P. Schultze (ed.), Handbook of paleoichthyology, 10. pp. 1-145. Gustav Fisher Verlag, New York.

Parisi-Baradad, V., A. Lombarte, E. García-Ladona, J. Cabestany, J. Piera and Ò. Chic. – 2005. Otolith shape contour analysis using affine transformation invariant wavelet transforms and curvature scale space representation. Mar. Freshw. Res., 56: 795-804. doi:10.1071/MF04162

Piera, J., V. Parisi-Baradad, E. García-Ladona, A. Lombarte, L. Recasens, and J. Cabestany. – 2005. Otolith shape feature extraction oriented to automatic classification with open distributed data. Mar. Freshw. Res., 56: 805-814. doi:10.1071/MF04163

Platt, C. and A.N. Popper. – 1981. Fine structure and function of the ear. In: W.N. Tavolga, A.N. Popper and R.R (eds.), Hearing and sound communication in fishes. pp. 3-38. Springer-Verlag, New York.

Schmidt, W. – 1969. The otoliths as a means for differentiation between species of fish of very similar appearance. Proc. Symp. Oceanog. Fish. Res. Trop. Atl., UNESCO, FAO, OAU. 393-396.

Smale, M.J., G. Watson and T. Hetch. – 1995. Otolith atlas of southern African marine fishes. In: Ichthyological Monographs of the J.L.B. Smith Institute of Ichthyology, 1: 1-244.

Worsley, J.C. and J.D. Drake. – 2002. Practical PostgreSQL. O’Reilly, Sebastopol, USA.




How to Cite

Lombarte A, Chic Òscar, Parisi-Baradad V, Olivella R, Piera J, García-Ladona E. A web-based environment for shape analysis of fish otoliths. The AFORO database. scimar [Internet]. 2006Mar.30 [cited 2023Dec.10];70(1):147-52. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/192




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