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Embryos of eastern rainbowfish Melanotaenia splendida splendida (Peters, 1866) tolerate fluctuating hypoxia

journal contribution
posted on 28.03.2019, 00:00 by Nicole Flint, RG Pearson, MR Crossland
© CSIRO. Hypoxia can have profound sublethal effects on reproduction and embryonic development of some freshwater fish. In the present study, the effects of diel fluctuating hypoxia on embryo viability were investigated for the eastern rainbowfish Melanotaenia splendida splendida, a small-bodied species common in wetlands of tropical Queensland. After daily hypoxic exposure (minimum 5% saturation) from fertilisation until hatch, no effects were found on egg incubation time, egg and larval mortality, and viability and size of hatching larvae. Older life history stages of the species are vulnerable to this level of hypoxia. Embryos of phytolithophilic species are likely exposed to fluctuating dissolved oxygen saturations in their natural habitat, and hypoxia tolerance may be a requirement for fish species that spawn predominantly on submerged plant material.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

69

Issue

6

Start Page

987

End Page

991

Number of Pages

5

eISSN

1448-6059

ISSN

1323-1650

Publisher

C S I R O Publishing, Australia

Peer Reviewed

Yes

Open Access

No

Acceptance Date

26/10/2017

External Author Affiliations

James Cook University; University of Sydney

Era Eligible

Yes

Journal

Marine and Freshwater Research

Exports

CQUniversity

Exports