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Aquameds is a mid size provider of fish medications to the koi and goldfish resources you often turn to. They support their retailers as well as the hobbyist. They have a consultation form of great utility. Retailers can also contact them through their site,

Fresh Wound Management in Koi
Young heron will eat their fill, then for practice they will stab remaining fish to hone their hunting skills.

Wound Management

Since wounds are NOT caused by a disease process and usually you can tell a wound from an ulcer, I'd encourage you to consider no handling at all. MAYBE medicated food.

The first step in the management of wounds is to establish the cause. If another fish is the culprit, then the two combatants must be separated. An example of such a mismatch would be a small Plecostomus with a large Koi, goldfish and pond fish. Once the plecostomus has eliminated all the algae in the aquarium, this wily scavenger might decide to rasp its next meal from the flanks of the Koi, goldfish and pond fish. This is a common behavior for Plecostomus.

Once the cause of the wound is established, you should correct whatever defect precipitated the damage. Sharp rocks in the tank should be removed, etc. Then the condition of the fish should be assessed. If the lesion is deep or exposes muscle, then the fish would merit an injection of an antibiotic. Do not apply antibiotics to the main system, as it will negatively impact the biological activity of the beneficial bacteria. I don’t care what the packaging says that came with the antibiotic capsules.

If the lesion is superficial and the fish is otherwise very healthy and will eat, then my recommendation is NOT to treat the fish (or the sore) with anything. Watch the wound closely.

In all instances, healing is accompanied by a decline in the redness of the lesion. An increase in the redness of the wound is prima facie evidence that an injection is commendable.

The condition of the water is actually as important as the condition of the fish. If your fish suffers a wound in water that is sub-optimal in quality, good healing will be unlikely. In fact, without good water, most minor wounds will worsen. To the contrary, most wounds will heal on heir own if water quality is maintained impeccably.

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Koi Beginner
Once you've leapfrogged through this tutorial you will have a solid, working concept of the Koi hobby and what it's all about. This is done just about exclusively with video and very little written material.
More than koi health, this site spans all things animal, by a real veterinarian who shoots you straight.

By Frank Prince-Iles. A UK authority who put this site together some time ago and which is still relied upon as a major source of good Koi and pond fish information

If you have a koi, pond or fish problem, this site takes you through twenty easy questions and at the end you know what you need to fix in your pond to create restored Koi health.
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If you need pet information AND Koi pondfish and pond information you might like DrJohnson.com which has everything from pet info, to vet info, to koi and pond fish. It has it ALL! Pet Information.

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