Results
author = "De Pontual Helene"
> : "otolith"
(x)
Unsupervised Bayesian reconstruction of individual life histories from otolith signatures: case study of Sr : Ca transects of European eel (Anguilla anguilla) otoliths
Description :
The reconstruction of individual life histories from chemical otolith measures is stated as an unsupervised signal-processing issue embedded in a Bayesian framework. This computational methodology was applied to a set of 192 European eel (Anguilla anguilla) otoliths. It provided a robust and unsuper...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Growth of Northwest Iberian juvenile hake estimated by combining sagittal and transversal otolith microstructure analyses
Description :
Daily growth of Atlantic juvenile hake from Northwest Iberia has been estimated employing a new approach combining analyses of transversal and sagittal sections of the otoliths along the ventral radius. Age of juvenile hake ranging from 3 to 25 cm collected during a spring 2002 survey was estimated....
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Daily variations of the saccular endolymph and plasma compositions in the turbot Psetta maxima: relationship with the diurnal rhythm in otolith formation
Author(s) :
Edeyer Anaick
,
De Pontual Helene
,
Payan P
,
Troadec Herve
,
Severe Armelle
,
Mayer-gostan N
Description :
We studied the circadian variations of the ionic composition ([Na+], [K+], [Cl-]), total CO2 ([tot CO2]), and protein concentration ([protein]) in the plasma and endolymph in the distal and proximal sides of the sacculus in the turbot Psetta maxima. Daily variations in total plasma calcium ([tot Ga]...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Reconstructing individual shape histories of fish otoliths: A new image-based tool for otolith growth analysis and modeling
Author(s) :
Fablet, Ronan
,
Chessel, Anatole
,
Carbini, Sebastien
,
Benzinou, Abdesslam
,
De Pontual, Helene
Description :
In this paper is presented a novel image processing tool for the extraction of geometric information in otolith images. It relies on the reconstruction of individual otolith shape histories from otolith images. Based on the proposed non-parametric level-set representation of otolith shape history, a...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Are hake otolith macrostructures randomly deposited? Insights from an unsupervised statistical and quantitative approach applied to Mediterranean hake otoliths
Description :
Individual fish age data are crucial to fish stock assessment, so their accuracy and precision are vital. The acquisition of age data most often relies on interpreting fish otoliths, a complex task in which expert subjectivity increases with the complexity of the structural patterns of the otoliths....
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Otolith growth in trout Oncorhynchus mykiss: supply of Ca2+ and Sr2+ to the saccular endolymph
Description :
Kinetic and pharmacological characteristics of Ca2+ fluxes across the saccular epithelium of trout were studied using a perfused isolated inner ear. Ca-45(2+) influx from the Ringer solution to the endolymph was 3-4 nmoles h(-1) mu(-1) endolymph, which corresponds to a global turnover rate of the en...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Importance and future of individual markers for the ecosystem approach to fisheries
Description :
The use of genetic, biochemical and electronic markers in population biology and ecology has been growing tremendously during the last two decades. The first part of this paper aims at reviewing the main principles and advances of these individual markers through a few key applications on exploited ...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Manual of Fish Sclerochronology
Description :
Sclerochronology, the study of calcified structures to reconstruct the past history of living organisms, is central to fish biology and fisheries management. This manual aims to provide an overview of the current theoretical and practical aspects of sclerochronological studies. By providing informat...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Characterization and variations of organic parameters in teleost fish endolymph during day-night cycle, starvation and stress conditions
Author(s) :
Guibbolini M
,
Borelli G
,
Mayer Gostan N
,
Priouzeau F
,
De Pontual Helene
,
Allemand D
,
Payan P
Description :
The aim of the present work was to examine the modifications of the organic composition of fish endolymph under environmental conditions (day-night cycle, starvation and Cl-2-Stress) known to modify otolith growth. Endolymph electrophoretic patterns were compared. An antibody raised against the trou...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English
Evidence of underestimation of European hake growth in the Bay of Biscay, and its relationship with bias in the agreed method of age estimation
Description :
In 2002, a pilot experiment on hake tagging was carried out using methodology specifically developed to catch and handle fish in,good condition. By the end of 2005, 36 hake and five tags had been returned to the laboratory (a 3.1% return rate) with a maximum time at liberty of 1066 days. The somatic...
Repository :
Archimer, Archive Institutionnelle de l'Ifremer
Language(s) :
English