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Fish losing smelling sense due to carbon dioxide level rise: Study

Published on July 27, 2018
Aquatic habitat under threat According to a recent study, fish are losing their sense of smell as rising carbon emissions is turning water they live more acidic.

Fish losing smelling sense

  • CO2 is absorbed by seawater forming carbonic acid.
  • Due of ocean acidification, fish will lose some of their smelling sense, making it more difficult to survive.
  • Fish use their sense of smell for essential things such as finding food and safe parts of ocean to re-produce, recognising each other and most importantly- sniffing out danger so that they can avoid predators.
  • Since 1800’s, ocean CO2 levels have risen by 43%. It is predicted to be more than double current level by the end of the century.

About the Study:

  • For this study, researchers compared behaviour of juvenile sea bass at CO2 levels typical of today’s ocean conditions and those predicted for the end of the century.
  • It was found that sea bass in acidic waters swam less and less likely responded when they encountered the smell of a predator.
  • It also showed that these fish were more likely to freeze as they were feeling anxious.
  • Though, only sea bass was used in the research, but the processes involved in sense of smell, are common to many fish species.
  • Thus, these findings will also apply to other types of fish as well.


Q1. Which sea organisms are losing their sense of smell as rising carbon emissions is turning water they live more acidic?
a. Octopus
b. Crocodile
c. Fish
d. None of the above

Q2. Which organism was used for research in this study?
a. Sea Bass
b. Shark
c. Whale
d. None of the above

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