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I am sorry, I am not getting your logic. Are you saying that the shrimp and salmon would be taking fish from the ocean anyway, so, if we are taking only 1.8 kilos of fish to grow 1 kilo of salmon or shrimp, we are doing good?
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Yes, that's doing good. You're talking about a 10-12 kilos of fish being eaten for each kilo an animal puts on in the wild. In captivity you're looking at about 1-3 kilos of
food (not fish) per kilo of growth. No more than 40% of that food is fishmeal (usually much less, and now often completely replaced by soy protein). That fishmeal is made up waste from fish processing and menhaden, which isn't captured by bottom trawlers, has extremely low bycatch rates, and ATM is being harvested sustainably.
Chickens and cattle eat about 25% more fish per lb of growth than farmed fish do and are by far the leading consumers of fishmeal.