Article (Scientific journals)
Otolith shape analysis and daily increment validation during ontogeny of larval and juvenile European chub Squalius cephalus
Bounket, Bernadette; Gibert, Pierre; Gennotte, Vincent et al.
2019In Journal of Fish Biology, 95 (2), p. 444-452
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Keywords :
Age; Cyprinidae; daily increment; Fourier; otolith; shape
Abstract :
[en] This assesses features of otoliths from laboratory-reared embryos, larvae and juvenile European chub Squalius cephalus from hatching to 180 days post-hatching (dph). We observed the development of the three pairs of otoliths (lapilli, sagittae and asterisci) and more precisely shape changes, as well as timing and deposition rate of increments of the lapilli. The lapilli and the sagittae were present at hatching, whereas the asterisci formed between 20 and 30 dph. The lapillus and sagitta shapes were round until 20 dph. From 60 dph the anterior and the posterior rostra of the sagittae were well developed, but very thin, making this otolith too fragile to manipulate for further studies of shape and validation of otolith increment deposition rate. The lapilli provided reliable age estimates for free embryos, larvae and juveniles up to 120 dph. However, caution should be taken when ageing fish older than 150 dph as an underestimation was noticeable. The regression of the number of otolith increments on age showed a slope and an intercept not significantly different from 1 and 0, respectively, which indicated that otolith growth increments were deposited on a daily basis, with the first microincrement occurring at hatching. Increment counts were consistent between three interpreters, indicating a consistent and reliable age estimate. This study validates that the otolith increment deposition rate can be used to assess hatching dates and daily growth of wild S. cephalus under 150 dph and in environments similar to the conditions used in this study.
Disciplines :
Zoology
Author, co-author :
Bounket, Bernadette;  Irstea > UR RECOVER > Equipe FRESHCO
Gibert, Pierre;  Irstea > UR RECOVER > Equipe FRESHCO
Gennotte, Vincent ;  CERER-Pisciculture asbl
Argillier, Christine;  Irstea > UR RECOVER > Equipe FRESHCO
Carrel, Georges;  Irstea > UR RECOVER > Equipe FRESHCO
Maire, Anthony;  EDF R&D LNHE > Laboratoire National d'Hydraulique et Environnement
Logez, Maxime;  Irstea > UR RECOVER > Equipe FRESHCO
Morat, Fabien;  PSL Research University > EPHE-UPVD-CNRS > USR 3278 CRIOBE
Language :
English
Title :
Otolith shape analysis and daily increment validation during ontogeny of larval and juvenile European chub Squalius cephalus
Publication date :
2019
Journal title :
Journal of Fish Biology
ISSN :
0022-1112
eISSN :
1095-8649
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
95
Issue :
2
Pages :
444-452
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 21 March 2019

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