As someone that did a lot of research into aquaculture for work a couple of years back, I'm now very picky about where I get fish, whether finfish or shellfish.
Safety, processes, practices and quality vary wildly by region and farm.
I'm in Scotland, and in general I'll select wild fish from Scottish waters or farmed fish from Norway, as the Norwegians have very good standards.
I'll also swerve fish (such as salmon) from Chile, as standards are relatively low there - for example, they permit a much higher sea lice count than anywhere in Europe.
For shellfish, I prefer wild Scottish sources, but Scottish farmed is OK too. I'd swerve shellfish (typically prawns) from Bangladesh, as despite farming often being done in a small scale, standards can be low.
Safety, processes, practices and quality vary wildly by region and farm.