It is a bad sign when a fish that is typically social or busy starts to segregate themselves and/or stays at the bottom of the pond clamping their fins. Jumping out of the water, scratching themselves on rocks, swimming much slower than normal or not with the other fish as usual are all signs that you should look into the health of your fish and the health of your pond water.
Physical Appearance Change
A helpful tool at helping to diagnosed and resolve potential fish problems and diseases, consider checking out the world renowned koi vet: Dr. Erik Johnson's webpage or the Koi Crisis website.
Water Quality is the #1 reason why fish get sick or die. There are parasites in your water no matter what you do because Mother Nature continually exists around your pond. A fish's slime coat protects them from these parasites but if stressed out because of poor water quality, the slime coat breaks down and the fish is susceptible to diseases. Consider adding Pond Salt to the water to increase the slime coat of the fish to be safe.
To maintain good balance in your water, consider your routine maintenance and your seasonal maintenance--
Was the waterfeature properly shut down in the fall?
Was a Spring Cleaning performed on the waterfeature?
What water treatments are you adding weekly or should be adding?
Is your filtration system big enough for your total gallons of water?
Do you have TOO MANY fish?
Are you overfeeding the fish?
Do you have enough aquatic plants in your pond?
So What Now?
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Dreamscapes Watergardens services koi ponds and waterfalls in the city of Lebanon, Lancaster, Harrisburg, Mechanicsburg, Camp Hill, Cleona, Cornwall, Fredericksburg, Indiantown Gap, Jonestown, Kleinfeltersville, Mount Gretna, Myerstown, Newmanstown Palmyra, Quentin, Reistville, Richland, Schaefferstown of Pennsylvania, PA