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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,

Fundamental Idea behind Injections Injections of Antibiotics
The "sweet spot" under the PELVIC fins is soft, scaleless and easy to penetrate, leaving the needle AWAY from delicate structures.

Starting Off: Injection Fundamentals

Fundamental Idea behind Injections
Injections of Antibiotics
- by Doc Johnson

Injections will be the only way to save the bacterially infected fish that will not eat. Soaking the infected fish in a bath of antibiotics is a last resort, but will not save valuable fish lives. I strenuously recommend that you obtain the necessary injectible antibiotics and the syringes and needles, and commence injections immediately. Azactam is also very good but has spotty to no availability of late. Nuflor is also well accepted and works, with only one injection because it is oil based.

Injection of Koi and other ornamental fish should be undertaken only when the risks are weighed against the benefits. There is a 5% chance that a fish will be injured or die when injected, even with a safe drug. With experience, the percentage drops dramatically. I recommend use of a 1cc tuberculin syringe. Needle size is best at 25 gauge, 3/4 inch length. Catch the fish as un-stressfully as possible. If the fish is laboring in the net, let him go and try again later. You can wrap a fish in a plastic bag with the water let out. Insert the needle at an angle, aiming through the fish as if to emerge at the mouth,going in just behind the ventral fins, but well in front of the anus or vent. Quickly depress the plunger and withdraw the needle.

DO NOT INJECT FISH IN THE BASE OF THE PECTORAL FIN. That is a horrifying misunderstanding by some folks, that has then been taught to others! It is the PELVIC fins that define the injection anatomy! When you inject in the base of the pectoral fin, you may be told that this avoids liver filtration of the antibiotic which is NOT true and has been disproven over five years ago. Worse, injection near the pectoral is within a short distance from the heart and gall bladder. This is a VERY risky place to inject a fish.


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