What is the cost to build and start an aquaponics system?

Image by nicmcc
Aquaponics Greenhouse – growing tilapia too.

Question by Richard M: What is the cost to build and start an aquaponics system?
I have built and been running a homemade hydroponics system in my gagrage growing tomatos and have recently discovered aquaponics(using fish for the nutrient supply) does anyone have experince in this, how much is the starting investment?
any explaination as to what epoc is?
any explaination as to what epoc is?

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