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Embryos of eastern rainbowfish Melanotaenia splendida splendida (Peters 1866) tolerate fluctuating hypoxia
Hypoxia can have profound sublethal effects on reproduction and embryonic development of some freshwater fishes. 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 or 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 DO saturations in their natural habitat, and hypoxia tolerance may be a requirement for fish species that spawn predominantly on submerged plant material.
MF17192 Accepted 26 October 2017
© CSIRO 2017