Q: How do I treat my pond fish for ich and other diseases?
Nadine – Okemos, MI
A: There’s nothing sadder than a sick fish—particularly when it’s your friendliest koi or most gregarious goldfish. If your underwater pal is looking a little under the weather, here’s what you need to do to nurse him back to health.
1. Water Change
Some clean, fresh water can make a big difference. It’s full of oxygen, and it’s devoid of pathogens that could be sapping his immune system and making him sick. So the first thing to do is complete a 25 percent water change to get some new wet stuff into the pond.
If only one or two fish seem to be affected, sequester them in an isolation tank. You can use an aquarium, a large plastic bin, a child-size swimming pool—whatever size is appropriate for your fish. Be sure to add pond salt to the water, which reduces fish stress, as well as an aerator and a net to cover the tank.
2. Inspect Your Fish
Next, you’ll need to get up close and personal with your finned friend. Examine him from head to tailfin. Do you see any signs of inflammation? Is there redness in his gills? Do you see cuts or scrapes? Strange parasites or spots? Make note of unusual findings to determine what illness your fish has. Some common diseases include:
- Ich: Technically known as Ichthyophthirius multifiliis, ich is an ectoparasite that presents as white spots on the body, fins and gills. Symptoms include loss of appetite, rapid breathing, hiding, resting on the bottom of the pond or tank, flashing, rubbing and scratching against objects, and upside down swimming near the surface. If not treated, ich will kill your fish.
- Anchor Worm: These copepod crustaceans from the genus Lernaea are parasites that latch onto fish and grow into an unsegmented worm-like protrusion. Visible with the naked eye, anchor worms cause localized skin redness and inflammation. A fish with anchor worm may frequently rub on objects or flash, have trouble breathing and appear lethargic.
- Fungus: Unlike ich and anchor worms, fungal disease—scientific name Saprolegnia—is an actual fungus that grows on fish that are injured or sick. Appearing as a white coating or cotton-like growths on the skin or fins, the fungus will eat away on the fish if left untreated, ultimately killing the fish.
4. Treat the Disease
Once you’ve determined what ails your fish, treat him with an appropriate remedy. You can find a range of treatments on The Pond Guy® Fish Health page, but here are some popular choices:
- MinnFinn™ is a natural, biodegradable, broad-spectrum treatment for parasites and fungal and bacterial infections. Many issues can be eliminated in as few as one to three treatments.
- Microbe-Lift® Parazoryne specifically attacks parasites, like anchor worms, fish lice and flukes, on goldfish and koi.
- Aquatic Nutrition Medicated Fish Food is formulated with four antibiotics that combat bacterial infections and disease while providing nutrition to your pond inhabitants. The soft pellets sink to the bottom of the pond where sick fish tend to hide.
- CrystalClear® KnockOut™ PLUS treats just about everything, including ich, parasites, protozoa, bacteria and fungi, that affect koi and goldfish.
4. Reevaluate Your Routine
You know the old saying, “An ounce of prevention is worth a pound of cure …” Well, when it comes to fish health, most times it’s true. Prevention is key to keeping your koi and goldfish healthy, and that prevention centers on your maintenance routines.
We recommend routine water changes, use of pond salt in low doses (don’t worry: it’s safe for your plants), filter clean-outs and removal of debris from the bottom of your pond. Doing so will keep your pond clean—and your fish happy and healthy.
Pond Talk: Have you ever nursed a fish back to health? If so, what did you do?
Filed under: Fish Diseases, Fish Population, Koi & Goldfish, Water Gardens & Features, Water Quality Issues | Tagged: anchor worm, fungus, how to treat anchor worm, how to treat fungus, ich, ick, minnfinn, sick fish, treating anchor worm | 4 Comments »