Spoke with the guys at Agway. They said it was definately a mink attack (+1 to gone fishin). I guess they rip off the heads, eat the guts and leave the rest...exactly as the crime scene is.
Upon closer inspection my koi looks to have been harrased as well. His scales are really damaged, but it looks like he's ok otherwise.
They also said my pump behavior was completely odd. Might be ordering a new pump.
-spence
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