Lusk made an interesting comment in the Q&A section of the recent PB Mag about tilapia. I don't have the mag in front of me, but I think he said something like he was unsure what kind of forage support tilapia actually offered for LMB.

Just a data point in this discussion.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."