It looks like a Cisco to me. They can reach a weight of 1 kilo. The fish in the pic is a bit harder to Id as it is bloated and looks like scales are missing
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I like fish cause they taste good
Well the only thing I can think of is a grass carp. Cause I was looking on the internet at fish hatcheries and theres quite a few small ones around here like in leduc area. they all said they raised grass carp. so im 99% sure its a grass carp. couldnt be a roach cause roach seldom reach over a pound. and they dont live here. not sure if this could be koi cause they dont have such huge scales. and whatever it was it didnt seem to be living nice cause it was dead when you found it
Likely a quill back sucker. especially if the stocked pond has a tie into the irrigation system. Grass carp would only be in there if F&W permitted someone to do such. A quick phone call to your local offiice could rule out carp.
Dont know , never seen anything like it. Looks wierd 
An Alien?
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