It has already been known for a long time fish, and in particular tuna, carry a lot of worms and parasites, which is why freezing rules are in place in pretty much every country.
For example here are EU regulations regarding freezing Tuna
Any angler will know that, in some lakes, it seems like every fish is full of worms. I've always dealt with that by frying the crap out of them -- no medium-rare bass for me, sorry. Alternatively, I'm sure they're fine after a few weeks in the freezer.
Rivers seem to be better, with worm presence (or at least, obvious worm presence) being less common. Additionally, I've never seen worms in bottom-feeding fish like catfish and carp.
Antibiotics of all sorts, runoff, etc... There's no magic panacea. Thai and Vietnamese shrimp farms have been known to kill of swaths of mangroves. This you can find from a Google search.
On a more anecdotal basis, I've also heard that Norwegian salmon is fed quite a cocktail of antibiotics etc and some people for that reason prefer New Zealand or Scottish salmon. Again this part I have no evidence.
So anyway my point is that it's definitely not as easy as it seems unless I misunderstand what "land based" means, I just assume they're fish farms not in the open sea but somewhere in a lake or an artificially made pool.
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[ 7.6 ms ] story [ 28.6 ms ] threadFor example here are EU regulations regarding freezing Tuna
https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=PI_...
EDIT: Looks like the next thread down goes into this. It is flash frozen to kill the parasites, usually on the boat.
That's a terrible sensationalist website btw...
In 2020, researchers at the University of Washington found evidence that Anisakis worms in raw seafood have increased 280 times since the 1970s.
So that seems new or new-ish.
Rivers seem to be better, with worm presence (or at least, obvious worm presence) being less common. Additionally, I've never seen worms in bottom-feeding fish like catfish and carp.
no just the heavy metals you can see...
I could just fish for perch, but what's the fun in that?
On a more anecdotal basis, I've also heard that Norwegian salmon is fed quite a cocktail of antibiotics etc and some people for that reason prefer New Zealand or Scottish salmon. Again this part I have no evidence.
So anyway my point is that it's definitely not as easy as it seems unless I misunderstand what "land based" means, I just assume they're fish farms not in the open sea but somewhere in a lake or an artificially made pool.