Otolith size-at-hatch reveals embryonic oxygen consumption in the zebrafish, <Emphasis Type="Italic">Danio rerio</Emphasis> |
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Authors: | A?Bang Email author" target="_blank">P?Gr?nkj?rEmail author |
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Institution: | (1) Department of Marine Ecology, Institute of Biological Sciences, University of Aarhus, Finlandsgade 14, 8200 Aarhus N, Denmark |
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Abstract: | Otoliths have frequently been used to reconstruct growth histories in larval, juvenile and adult fish. However, there is growing
evidence that otolith growth is directly determined by metabolic intensity and, consequently, only indirectly related to somatic
growth. By performing measurements of oxygen consumption rate and other early life-history traits on individual eggs of zebrafish
(Danio rerio), we found that oxygen consumption explained residual variance in otolith size that is not accounted for by egg size. Total
oxygen consumption during the embryonic stage explained 34% of the variance in sagitta size at hatch, whereas larval size
at hatch (as a proxy for growth during the embryonic period) was not significantly correlated with sagitta size. This strongly
suggests that otolith growth is directly related to metabolic rate, and yields a mechanism that may explain recent observations
of a link between otolith size at hatch and viability in larval fish. |
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