- We've lost 3 fish in 3 days. They just suddenly flop over and die - there's obvious infection/fungus/parasite of some sort (see pics)- but otherwise no flashing/rubbing/gasping/or otherwise abnormal behavoir. We've been keeping koi for about 2 years now, but still consider ourselves semi-novice. Not clueless, but not experts by any means.
PH : 7.4
Ammonia: -.25ppm (not perfectly yellow, not quite at the .25 color)
*I know, parameters not ideal - planned water change in A.M.
1 dose each of Pimafix and Melafix, then I stopped.
200 gal. ( a temp holding tank as we moved late July), outdoors - 2 aeration bubbler stones - bio pressure filter w/ waterfall - no plants at this time.
So when the first one suddenly died, it was pretty darn sudden as in it appeared fine and then BAM, sideways and dead at the bottom. NO visible anomalies on it or any other koi in the pond at that time.
Next day another one suddenly died. At that time slight skin anomalies visible on all fish in pond, but spotty.
One dose each of Pimafix and Melafix and the next day the skin anomalies seemed drastically reduced, if not gone entirely by the naked eye at least.
Today, another sudden die off, and visible skin issues now "covering" entire bodies of remaining fish.
Gills were checked on thos that were dead/dying (in water) and looked red and clean.
See attached photos (best I could do just now, at night)
Will do water change tomorrow ASAP.
Have Pimafix and Melafix on hand - also Herbtana and Artemis - as well as Clout - again, not currently using anything since that first P and M dose over 72 hours ago.
We've had these guys for 2 years now, raised from wee little tiny runts, and now we're down to two and it's awful. Would hate to lise the big yellow guy pictured. Have a good pond store nearby I can pickup treatments etc. if anyone has suggestions.