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?
(I'm mostly kidding, I love fishing for perch too.)
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.
For 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.
I am from an older generation, I have never nor will ever eat sushi :)
Never too old to try something that is incredibly delicious. :-) My mom (born 1943) introduced me to sushi. Can't blame generation there.
You're really missing out. It's probably my favorite food on the planet, lol.
That's a terrible sensationalist website btw...
But the cold kills the parasites. Its why "sashimi grade fish" is safe.
This term has no legal definition and is unregulated. A fish caught, cut, and thrown on a plate as sashimi could be called sashimi grade having never touched a freezer to kill off parasites.
I can assure you by direct experience than the adults colonies could pass for a noodless dish at the first look.