Koi Fish Information Centre

Internal bacterial infection. It’s what caused the pop-eye and is now causing the bloating.
Given your limited access to medicines, the best thing you can do for all of your fish is to make sure they have optimal conditions so they have less of a chance of getting sick in the first place. This means keeping your tank(s) under stocked and keeping the water quality in top condition. Actually, that is the best thing that any of us should do rather than relying on meds to treat the fish that get sick because of overstocking and/or poor water quality.
If you decide to euthanize, here’s a site with some “humane” ways to do it. http://www.wisegeek.com/what-is-the-most-humane-way-to-euthanize-a-fish.htm
Lenny Vasbinder Fish Blog - http://GoldLenny.blogspot.com

Category: Philippines Internet Koi Society