Frequency demodulation on otolith numerical images for the automation of fish age estimation / Troadec, Hervé

Public ISBD Faire une suggestion d'achat Titre : Frequency demodulation on otolith numerical images for the automation of fish age estimation Type de document : texte imprimé Auteurs : Troadec, Hervé, Auteur Importance : pp. 207-219 Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : A method to assist the reading of calcified structures with digital images is proposed. An a priori growth pattern is introduced in the image processing to take into account both the variability of the ring size and thé non-linearity of their growth. The introduction of biological knowledge is performed within a demodulation processing using the reciprocal growth function. The ring number is estimated by spectral analysis. The constraints introduced by thé growth mode! are weak since they are restricted to the definition of L0, in the case of an exponential model, or of Lin the case of a Von Bertalanffy model. When applied to larval Dover sole otoliths (Solea solea) results close to the expert's are obtained. In the case of saithe otoliths (Pollachius virens) the mean discrepancy with the expert's, i. e. 1.5 years, can be assigned to the lack of processing of marginal rings and to the inadequacy of the morphogenesis model on which the processing algorithm is based. This approach which is only founded on the dynamic features of the "biological signal", will hâve to be completed in future work with the introduction of structural information. Frequency demodulation on otolith numerical images for the automation of fish age estimation [texte imprimé] / Troadec, Hervé, Auteur . - [s.d.] . - pp. 207-219. Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : A method to assist the reading of calcified structures with digital images is proposed. An a priori growth pattern is introduced in the image processing to take into account both the variability of the ring size and thé non-linearity of their growth. The introduction of biological knowledge is performed within a demodulation processing using the reciprocal growth function. The ring number is estimated by spectral analysis. The constraints introduced by thé growth mode! are weak since they are restricted to the definition of L0, in the case of an exponential model, or of Lin the case of a Von Bertalanffy model. When applied to larval Dover sole otoliths (Solea solea) results close to the expert's are obtained. In the case of saithe otoliths (Pollachius virens) the mean discrepancy with the expert's, i. e. 1.5 years, can be assigned to the lack of processing of marginal rings and to the inadequacy of the morphogenesis model on which the processing algorithm is based. This approach which is only founded on the dynamic features of the "biological signal", will hâve to be completed in future work with the introduction of structural information.

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Manual of fish sclerochronology / Troadec, Hervé

Public ISBD Faire une suggestion d'achat Titre : Manual of fish sclerochronology Type de document : texte imprimé Auteurs : Troadec, Hervé, Auteur Editeur : IRD Année de publication : 2002 Importance : 463 p. ISBN/ISSN/EAN : 2709914095 Langues : Français (fre) Index. décimale : 597 Vertébrés à sang froid. Poissons Résumé : Sclerochronology is the study of calcified structures to reconstruct the past history of living organisms, is central to fish biology and fisheries management. This volume aims to provide an overview of the current theoretical and practical aspects of Sclerochronology studies. By providing information on the nature of calcified structures, their uses in fish research and methods for preparation and examination, the manual constitutes a comprehensive guide for researchers, technicians and students either new in the field or interested in expanding their range of expertise. This book entitled " manual of fish Sclerochronology " addresses a board range of topics, including interpretation of various types of calcified structures, and details the validation of interpretation techniques, using direct, semi direct, and indirect procedures. Nit includes an extensive review of the use of the data, particularly growth and growth analysis, ecological applications, and demographics. Manual of fish sclerochronology [texte imprimé] / Troadec, Hervé, Auteur . - IRD, 2002 . - 463 p. ISSN : 2709914095 Langues : Français (fre) Index. décimale : 597 Vertébrés à sang froid. Poissons Résumé : Sclerochronology is the study of calcified structures to reconstruct the past history of living organisms, is central to fish biology and fisheries management. This volume aims to provide an overview of the current theoretical and practical aspects of Sclerochronology studies. By providing information on the nature of calcified structures, their uses in fish research and methods for preparation and examination, the manual constitutes a comprehensive guide for researchers, technicians and students either new in the field or interested in expanding their range of expertise. This book entitled " manual of fish Sclerochronology " addresses a board range of topics, including interpretation of various types of calcified structures, and details the validation of interpretation techniques, using direct, semi direct, and indirect procedures. Nit includes an extensive review of the use of the data, particularly growth and growth analysis, ecological applications, and demographics.

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