This article contains numerous misrepresentations and omissions.
a) Global fisheries are already down over 50% NOW.
b) A temperature rise of 4 °C will result in a catastrophic collapse of civilization.
c) A 9.6 °C increase will literally mean human extinction (long before).
d) The resulting food chain collapse @4 °C or even 9C will mean massive species extinction of all mammals. It is also extremely unlikely that any fish will survive at the higher temperatures.
This is a pretty good example of how computer modeling totally fails to include sufficient parameters and variables. I am not aware of any credible sources that claim such ridiculous projections such as this.
The only way any science could come up with such figures and projections is to wear blinders and not be aware of any of the published literature regarding survivability at higher temperatures.