Effect of the hydrostatic pressure on otolith growth of early juveniles of Nile tilapia Oreochromis niloticus |
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| Authors: | Correia A T Coimbra A M Damasceno-Oliveira A |
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| Affiliation: | 1. Centro Interdisciplinar de Investiga??o Marinha e Ambiental (CIIMAR/CIMAR), Rua dos Bragas 289, 4050‐123 Porto, Portugal;2. Centro Interdisciplinar de Altera??es Globais e Bioengenharia (CIAGEB)/Faculdade de Ciências da Saúde (FCS), Universidade Fernando Pessoa (UFP), Rua Carlos Maia 296, 4200‐150 Porto, Portugal;3. Centro de Investiga??o e de Tecnologias Agro‐Ambientais e Biológicas (CITAB), Universidade de Trás‐os‐Montes e Alto Douro, Quinta de Prados, 5000‐911 Vila Real, Portugal |
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| Abstract: | Nile tilapia Oreochromis niloticus early juveniles were maintained for 2 weeks in a pressurized system under a controlled photoperiod, at constant salinity and temperature. Groups of fish were exposed to one of three absolute hydrostatic pressure (HP) regimes: (1) a constant normal atmospheric pressure (100 kPa), (2) a constant 40 m pressure (500 kPa) or (3) a semi-diurnal cyclic vertical migration (100-500 kPa). No significant differences were detected in otolith size and incremental periodicity among the three HP treatments, suggesting that HP does not affect otolith growth of early juveniles O. niloticus. |
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| Keywords: | Cichlidae diel vertical migration microstructure sagittae |
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