While the idea of Tilapia feeding on chicken poo is rather gross... I have to realize that I am an American. We live in a society that in general is completely ignorant of the food chain. I work with a young woman who wouldn't cook chicken, b/c she didn't like seeing raw meat in those cellophane covered styrofoam packages. She'd have a melt down if any raw meat touched any surface in her kitchen. Freak out if she ran out of bleach wipes. (Um... in my house, bleach comes in a jug!) She wouldn't cook an egg b/c she didn't like the looks of the inside of an egg... and on and on the food phobia goes.
I love a good lobster or crab dinner. Those critters are the hoovers of the ocean, cleaning up all manner of filth. Same with clams, mussels, and oysters. So, how is a Tilapia that eats poo much different? Sometimes, ignorance is bliss. I used to enjoy Tilapia, and am sure that I will enjoy it again... after I have some mental processing time. Really, is eating a Tilapia that has filtered chicken poo through it's system much different than eating a salad that has grown with benefit of chicken poo compost?
And I LOVE the idea of Aquaponics: Think of the economic impact: If every home owner had a green house set up with an Aquaponic system, they could produce a LOT of their own food. Add chickens and perhaps a few rabbits to the mix, and I'm wondering if it might be possible to shed the notion that it's necessary for every household to have 2 full time incomes.