The combined effect of temperature and pH on embryonic development of obscure puffer Takifuguobscurus and its ecological implications

Rising temperature and decreasing pH caused by climate change may affect the development of fish. The objective of this study was to determine the combined effects of temperature (19, 22, 25, 28 °C) and pH (5, 6, 7, 8) on incubation time, total hatch rate, abnormal rate, and viability of newly hatched larvae 24 h post-hatch of obscure puffer Takifugu obscurus fertilized eggs. The results showed that incubation time was significantly shortened with increase in temperature and delayed at low pH. Significant interaction was detected between temperature and pH on incubation time. Both temperature and pH significantly affected the total hatch rate, abnormal rate, and the viability of newly hatched larvae, but no significant interaction was detected. Such results indicated that fluctuations in temperature and decreasing pH in waters during the spawning season of this anadromous species may have substantially negative impacts on its population recruitment and persistence.

Wang J., Li Z., Chenb Y. & Yang Z., 2015. The combined effect of temperature and pH on embryonic development of obscure puffer Takifuguobscurus and its ecological implications. Biochemical Systematics and Ecology 58:1-6. Article (subscription required).


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