Common Symptoms of Koi Problems
Flashing, Scratching, Jumping -You have parasites in the pond. See Medicine Chart for treatment
Ulcers, Red sores, Hole in the side disease - This is a gram-negative Bacterial infection caused by Aeromonas. See Medicine Chart for treatment
Red streaking in Fins & body - This is a gram-negative Bacterial infection called Hemmorhagic Septicemia. Large ulcers, similar to Aeromonas will appear in severe cases. See Medicine Chart for treatment
Slimy growths appear on Skin and may turn into sores - This is a Saproglenia Fungus that is common in pond fish. Separate the affected fish if possible to medicate them. If you cannot separate the fish, treat the entire pond with Forma-Green for 5-7 days also See Medicine Chart for treatment
Fins are frayed and the water is cloudy - You have an Ammonia problem in the pond. Start doing partial water changes immediately and test the water for Nitrites and Ammonia.
Fish gasp for air and hang just beneath the waterfall - Bacterial Gill Disease, Gill Flukes or lack of oxygen in the water. If the inside of the gill is brown/green in color, this could be Bacterial Gill Disease and needs to be treated quickly. See Medicine Chart for treatment. If Gills appear to look almost normal, or slightly reddish, this is probably Gill Flukes and needs to be treated. See Medicine Chart for treatment. If the fish appears to not have sores or infection and there is a lack of movement in the pond water you need to add aeration rather quickly. They are lacking oxygen.
Excessive slime covers entire fish - Make sure your water is not Over-Salted. This makes the fish produce more slime coat. If this is not the case, they could have a protozoan infection. See Medicine Chart for treatment
One or both Eyes are popped out - This is called pop eye, and is caused by a Kidney Infection. This could also be the start of Abdominal Dropsy. Immediate treatment is essential See Medicine Chart for treatment
Fins are eaten away and covered with a white coating - This is a gram-negative Bacterial infection called Flexibacter Columnaris. This can also appear anywhere on the fish especially the mouth. See Medicine Chart for treatment
Fins are red and eaten away - This could be a couple of different diseases. It could be a gram-negative Bacteria, or a parasitic infestation. Fin and tail rot is the most common. Try treating the fish with Forma-Green or See Medicine Chart for treatment