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I love eating Tilapia. Guess what they eat?
Fish shit. Tilapia are used to clean aquaculture tanks after they've become fouled with excess excrement and food debris.
Disgusting? Maybe, but they still taste damn good to me!
We need to start shifting our appetites to fish that can be farmed efficiently and economically, and leave the wild stocks as a special treat.
It's probably better for Orcas to live on a diet of wild-caught salmon than it is for us to consume them. Just keep the Atlantic salmon farms in the Atlantic, and learn to farm Pacific varieties (or Char, or something else yummy) in the Pacific so we don't screw up species isolation.
Also, don't over-concentrate fish farms (although, compared to current agriculturally-generated estuary dead zones, fish farms are small potatoes).
We gotta get smart.
Also, contraception for humans is an extremely good idea.