I have a large mature pond that has suddenly experienced a massive death rate among my larger fish.
As well as several "fancy" Koi, the deaths include Mirror and Leather Carp.
All the fish were in the 8-14lb bracket, and were in excellent condition prior to the outbreak.
A total loss of eighteen fish over a period of 10 days. The fish showing no outward sign of disease or distress. No fungus/Finrot/Gill Infection/Scale Loss/Eye Cloud or bloating. The fish were eating well up three or four days before the outbreak.
A large number of smaller fish, mainly "Fancy" Goldfish, are fine .. They have sailed through the period and are eating well.
The pond itself appears immaculate .. Crystal-clear water with abundant plant growth. The water is well filtered and aereated. No "Blooms" or algae growth. Chemical levels test confirm all OK.
Anybody else had this problem ??
Edited by MrWiggly, 05 September 2007 - 03:35 PM.