Salmon Oil

do sardines have the same benefit as salmon oil then?
It’s the small oily fish that have the beneficial omega 3. What I’ve heard about salmon is that they risk carrying heavy metals. And farmed salmon is lower in omega 3 than wild.

Apparently more than half of small oily fish that are caught are used to feed farmed fish (as fish meal) because fish absolutely have to get omega 3 to survive.
 
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