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| Troadec, Herve. |
| 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 the 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 the growth model are weak since they are restricted to the definition of L0, in the case of an exponential model, or of L∞ in 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... |
| Tipo: Text |
Palavras-chave: Otolithe; Image numérique; Âge; Croissance; Solea solea / Pollachius virens; Otolith; Digital image; Age; Growth; Solea solea / Pollachius virens. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00189/30072/28560.pdf |
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| Gaamour, A.; Missaoui, M.; El Abed, A.; Deniel, Ch.. |
| A new osseous part, the opercula bone, is used to estimate the age of 2099 round sardine Sardinella aurita, Valenciennes, 1847 captured in the Cap Bon area. The period of sampling, with a monthly rhythm, is spread out June 1994 at December 1995 and from June to September 1996. The relation between the length of fish (LF) and the ray of opercula (RT) is LF = 22,25 RT 0,994. The validation of the age estimate method is carried out directly by the monthly follow-up of average marginal lengthening and the percentage of individuals with marginal hyaline zone. This study showed that the round sardine has a double cycle of growth per year. The analysis of the key age-length shows that the females dominate in the majority of the age groups. The parameters of... |
| Tipo: Journal Contribution |
Palavras-chave: Allache; Os operculaire; Âge; Croissance Age determination Growth curves Age determination http://aims.fao.org/aos/agrovoc/c_24110. |
| Ano: 2001 |
URL: http://hdl.handle.net/1834/3784 |
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