I don't know how big your fish are but 30 in a 1000 gallon pond is pushing it to put it mildly. With this number of fish in the pond, many if not all of which are immune to resident populations of parrasites, viruses and bacteria but carriers none the less, are probably exposing your new fish to organisms they have never before encountered. The stress of the move coupled with the stress of adapting to new surroundings in a pond already well populated with other fish increases stress levels still further and they will go down hill very quickly indeed.
My advice is to stop adding fish and think about thinning out the fish you have. They will double in size in the first year and when they do, I guarantee the few fish you are losing now could escalate into a total wipe out.
A pond is an eco system pushed way beyond anything nature would tolerate. You can have the best water, a perfect diet and plenty of O2 but overcrowd your fish past a certain well defined limit and mother nature will reak her revenge.
Alan
Posted on Aug 19, 2005, 12:24 AM from IP address 213.120.101.21