What did I miss?
The core of the story is this.
"The study modeled climate change between 2000 and 2050 using data from the Intergovernmental Panel on Climate Change, a joint effort by the United Nations Environment Program and the World Meteorological Association. It forecasts fish will shrink between 14 percent and 24 percent in that time frame."
What other factors did it discuss?
The only other point mentioned is a brief and vague "Smaller fish are less likely to reproduce, for instance." No mention of what they mean by that. No discussion on how small size limits, supporting overfishing, allow fish to be caught before they are old enough to breed, but I'll give you that one as being implied.
What else is there?