I found this stunning looking animal at Ebay tonight, and the seller discribes the shark being able to be kept with koi. I wonder if its true....
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...2392444940&rd=1

perhaps it is a vegetarian? or maybe because same sized koi, it cannot get them into its mouth...
though at 3 feet it outgrows the koi by over a foot... hmmm

I saw them in person for the first time a couple weeks ago at the lfs. They really caught my eye because they were so different,and were in the fancy gold fish and koi tanks. Must be pretty laid back fish-I thought they were pretty cool looking,other than that I had never even heard of them.