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High incidence of otolith abnormality in juvenile European flounder Platichthys flesus from a tidal freshwater area

Title
High incidence of otolith abnormality in juvenile European flounder Platichthys flesus from a tidal freshwater area
Type
Article in International Scientific Journal
Year
2017
Authors
Neves, V
(Author)
Other
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Guedes, A
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FCUP
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B. Valentim
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FCUP
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Campos, J
(Author)
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Freitas, V
(Author)
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Journal
Vol. 13
Pages: 933-941
ISSN: 1745-1000
Publisher: Taylor & Francis
Other information
Authenticus ID: P-00N-CK1
Abstract (EN): Otolith abnormality has been reported for a wide range of freshwater and marine fish species. In this study, the sagittal otolith morphology and mineralogy of juvenile European flounder, Platichthys flesus, were examined to describe the incidence and types of structural deformities in this species. Juvenile flounder were collected over the years 2013-2015 in the tidal freshwater section of an estuarine nursery (Minho estuary, NW Portugal). Otolith abnormality was found in 43% of the individuals and, in most cases, occurred in both otoliths. Despite an abnormal mineralogy confirmed by scanning electron microscopy, the morphometry and the mineral polymorph composition of abnormal otoliths did not differ from normal ones (i.e. aragonite). This contrasts with other studies where vaterite and/or calcite were found to replace aragonite in abnormal otoliths. Further studies are needed to elucidate whether abrupt salinity changes associated with habitat transitions may have played a role in the abnormal otolith biomineralization in this species.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 9
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