Are herons considered a koi predator? Yes 100% Get Free Quotes Today! Question: Are herons considered a koi predator? Top Answer (100% of 6 votes): Yes. Answer: Yes Explanation: Top proedators Timeless Ponds & Fountains Answer: Yes Explanation: Great Blue Heron can eat all your koi and pond fish La Rose Home Repair Get Free Quotes Today! Find Local Pros Free Pond Installation Cost Estimates Related Questions How Much Does It Cost to Put in a Koi Pond? What is a Stock Pond? What is a Retention Pond? Would you recommend hiring a Certified Aquascape Contractor (CAC) to build a pond?Top answer: Somewhat important What is the minimum size koi pond you would recommend building?Top answer: 250 gallons