In North America, cardinals will usually be wild caught. In Europe, I believe they have tank-raised fish from the Czech Republic and perhaps other places now, but I know the Czech were breeding cardinals a decade or so ago. I have rarely seen "tank-raised cardinals" advertised locally, so I assume most here (in NA) are wild.
Now, on the matter of wild caught fish, this is a concern many share, that we may be depleting wild stocks by over collecting. And while this is likely to have occurred with a very few species, it really is not significant in most cases. Destruction of the natural habitats is progressing alarmingly rapidly in some areas, particularly in SE Asia more than in South America. And this is a far greater disaster for the fish. There are most assuredly fish species that will be extinct before we have ever discovered them.
Most countries in SA have laws regarding the time of year when specific species can be collected, and if these are followed, the species should not be threatened. Aside from this, there is also the Project Piaba. This has been operating for several years now, and the idea behind it is that the resident peoples can make a decent living collecting ornamental fish, and this means they will not be cutting down the forest for agriculture. All this destruction of the rainforest is a very serious problem, and providing economic stability to the people while preserving the environment is well worth it. And not surprisingly, the locals know how many fish they can catch without depleting the species, and since it is their livlihood for many years to come, they are careful to be environmentally sound, Of course, if no one buys their fish, the idea will soon peter out, so there is a good reason to acquire wild caught fish.
Here's more on the Project Piaba:
http://projectpiaba.org/
My concern is more for the individual fish than for the environment (although, of course I do care about the environmental impact as well). In the organization you link to above, I like the way they seem to raise the fish in nets in the river. It would be less traumatic for the fish to be netted if they live in an enclosure versus being scooped up from the pure wild. As long as they aren't treating the fish with antibiotics or other medicines that get into the environment like farm raised salmon that are kept in ocean pens.
When the tank lights come on, I have to do another inspection for bodies to see if any died in the night. I have to take at least 7 dead ones back this morning. Ugh.