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| Lagardere, Françoise; Troadec, Herve. |
| Close similarities have been found between the otoliths of sea-caught and laboratory-reared larvae of the common sole Solea solea (L.), given appropriate temperatures and nourishment of the latter. But from hatching to mouth formation. and during metamorphosis, sole otoliths have proven difficult to read because the increments may be less regular and low contrast. In this study, the growth increments in otoliths of larvae reared at 12 degrees C were counted by light microscopy to test the hypothesis of daily deposition, with some results verified using scanning electron microscopy (SEM), and by image analysis in order to compare the reliability of the 2 methods in age estimation. Age was first estimated (in days posthatch) from light micrographs of whole... |
| Tipo: Text |
Palavras-chave: Larval sole; Solea solea; Otolith; Daily increment; Validation; Image analysis. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00337/44785/44488.pdf |
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| Doray, Mathieu; Stequert, Bernard; Taquet, Marc. |
| Daily growth increments measured in the otolith of Thunnus atlanticus were used to estimate the age and growth of individuals. which were sampled from an artisanal fishery operating around fish aggregating devices (FADs) moored off Martinique Island. In this study, 76 otoliths were analysed for fish ranging from 20 to 68 cm fork lengths (FL). The fish were caught using trolling lines at depths ranging from 0 to 10 m. Counts were made, under a light microscope, on the external part of the transverse section of the sagittae, from the primordium to the ventral edge. The mean coefficient of variation of the age reading was 2.4%. To validate readings, the number of increments for 11 individuals was counted using both optic and scanning electron microscopes. The... |
| Tipo: Text |
Palavras-chave: Thunnus atlanticus; Daily increment; Otolith; Age. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-396.pdf |
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