This was posted in the commentaries.
The new laws will probably be rarely enforced (although I expect there will be a few scapegoats made). Switzerland is a very law abiding country and members of society effectively enforce them themselves. Therefore if you have a solitary goldfish in a small bowl, expect your neighbours, friends and even family to come down on you hard for this. You would effectively be bullied into complying without any bureacratic involvement. The goldfish example you provide wouldn't occur as the parents would respect the law and therefore wouldn't house the goldfish in those conditions. You my find this far-fetched but this is a country where work is practically outlawed on sunday, even washing your car in a residential area may well generate complaints from neighbours. It may sound oppresive but it definately works. The Swiss love bureaucracy, it's a fact of life over here which took some getting used to (for me) as paperwork is endless.
This law would not work in the UK as respect for authority is not observed in the same way. If you tell people not to flush fish over here then the majority will not, I doubt you would get the same response in the UK. I fail to see how regulating aquariums (outlawing bowls etc) is a bad thing, you stop shops from selling these unsuitable vessels. Having a minimum tank size for tankbuster fish is a very positive move. The shops wil enforce it as best they can (the quality here is far above that I have observed in many UK fish stores). I will be chatting with my LFS about the laws over the next few weeks and will report back their opinions and concerns via the forum.
As a closing statement, isn't it great that a government accepts that fish are capable of experiencing pain and suffering and are taking positive steps to reduce this?