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

Flint, N., Pearson, R.G., and Crossland, M.R. (2018) Embryos of eastern rainbowfish Melanotaenia splendida splendida (Peters, 1866) tolerate fluctuating hypoxia. Marine and Freshwater Research, 69 (6). pp. 987-991.

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Abstract

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.

Item ID: 54606
Item Type: Article (Research - C1)
ISSN: 1448-6059
Keywords: freshwater, larval biology, pollution, tropics, wetlands
Copyright Information: © CSIRO 2018.
Funders: Sugar Research and Development Corporation (SRDC), Rainforest Cooperative Research Centre (RCRC), Queensland Government (QG)
Projects and Grants: RCRC Catchment to Reef Program, QG Growing the Smart State Program
Date Deposited: 18 Jul 2018 08:02
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060204 Freshwater Ecology @ 100%
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