Again, this study doesn't equate to this product being snake oil.
Years ago Dr. Eric Johnson, a renowned DVM that specializes in fish, came up with similar results in the following article;
http://www.koivet.com/a_melaleuca_tea_tree_oil_koi_wounds_healing.html
Where he stated:
"Melafix is promoted to have antibacterial properties but our research has shown this is not the case. We treated an inhabited system for five consecutive days and then ran CFU (colony forming unit) tests on the water and found a typical population of Aeromonas hydrophila/caviae, and Citrobacter freundii, as well as Serratia spp."
Having said that, he followed that with;
Koi With Wounds in Our Testing
We treated daily, using NO OTHER ADJUVANTS or other therapies. The wound was never dressed topically and the fish was never injected. No water changes were done. No SALT was applied or present in test tank water. Within three days, healing was impressive.
- MelaFix does not harm the filter
- MelaFix does not impact the pH
- MelaFix is NOT bactericidal as claimed.
- MelaFix (1% Melaleuca) ENHANCES AND SPEEDS HEALING
- MelaFix is the most impressive water borne treatment for superficial wounds and bacterial sores I have ever seen.
- MelaFix is non toxic to all freshwater species tested.
- MelaFix may obviate the need for injections in superficially infected fish.
I will probably add the recommendation of MelaFix to all my cases where a water treatment is practicable and where healing is urgently needed.
So while Melafix may not be the silver bullet when it comes to killing bacteria, it can potentially still be used in at least some cases to enhace healing.