CNN reports that the city of Rome has passed a set of laws to prevent cruelty to animals. For instance, dog owners will be forced to walk their dogs regularly. And round goldfish bowls have been banned because round bowls supposedly cause the fish to go blind. Specifically, the article says:

The newspaper [Il Messaggero] reported that round bowls caused fish to go blind. No one at Rome council was available to confirm this was why they were banned. Many fish experts say round bowls provide insufficient oxygen for fish.

I have never before heard this claim about the dangerous effects of round bowls. I tried to google "round bowls goldfish blind" to see if anyone has written about this, but no luck. However, depending on the size of the opening in the bowl, it does seem logical that the fish may not get enough oxygen. And if they don't get enough oxygen, maybe they'll go blind (shortly before they die).

Incidentally, I'm totally in favor of laws forcing people to walk their dogs. I hate it when people (such as my neighbor) keep their dog chained up in their yard all day, every day.