does any 1 keep koi carp in there garden pond ? i also have 3 stergoen im alright with the koi but can find little info on stergeon i have lost 2 this year got3 left tho water quality ok had it tested the stergeon go a milky colour then start swimming on there backs and go up sidedown may be a swim bladder prob but all the koi are all ok stergoen are about 9ins long long got about 30 fish in pond the size of the pond is 5yards 4 yards wide and 5ft at its deepest point 2 oxygen stones goin all the time pressureised filter and u.v pump will turn the water round evry hour water is gin clear and ok any1 help me with the stergoen or some1 who has kept them in the past and had the same probs as me hope some1 wil be able to help before i loose any more best regards to you all steve...

This is a hard one?. I had a google look and could only find the site below in the UK. Other than that i can only recommend the Water Garden Centre on Langsett Rd.

http://www.practicalfishkeeping.co.uk/pfk/pages/show_article.php?article_id=105

Do you have any plants hanging over the pond that may be toxic to the fish? Koi are usually a bit stonger than most fish, and will survive a little longer than most in toxic conditions!

Never heard of this fish being kept but its spelt sturgeon. This may help with your research. Are you starting a caviar business?