The wife and I go down to Medicine Park, a small tourist town in SW Oklahoma a couple times a year. We were eating lunch on the patio of a restaurant that looks over Medicine Creek. I had heard Medicine Creek was a good trout fishery (rare in Oklahoma). I noticed there were a ton of huge fish finning on top of the water. I could not tell what they were from where I was sitting, so I asked the restaurant owner. He said they were Big Head Carp, thousands of them!
Wife and I walked down to the water and walked over a pedestrian bridge to get a look. From bank to bank there was nothing but 30+ pound Big Head Carp

I had never seen one carp any where near that size, and here the whole friggin river or creek was completely full of them. I asked does anyone fish them? He said a couple of Vietnamese men come down occasionally and take a few. But he does not know if they eat them or not. He said he use to take a couple home for his garden, but the were so big he only needed one or two. He stopped because the neighborhood cats and dogs would dig up his gardens,

They are an invasive species, I am surprised the State Fish and Game Department has not netted them out of there.