"I think that's a big leap in judgment. When you review the literature you find that under certain conditions garlic has shown effects as an immune booster and has shown limited success in controlling (not curing) pathogens in fish. However, those results are highly dependent on the methodology used and just about as many studies have failed to find any notable effect. The question isn't whether garlic can kill pathogens, but whether garlic as it's used within the hobby can kill pathogens or improve health and that question is still very much up in the air."
As I stated before, studies have been done, and it's proven to do what you question. The biggest problem is that allicin is highly unstable see below ,
http://en.wikipedia.org/wiki/Allicin
"Allicin compound obtained from garlic that has demonstrated potent antibacterial and anti-fungal properties that protect garlic from pathogens [1][2]. Allicin is also the chemical constituent primarily responsible for the hot, burning flavor of fresh garlic.[citation needed]
Allicin is not present in garlic in its natural state. When garlic is chopped or otherwise damaged, the enzyme alliinase acts on the chemical alliin converting it into allicin.[3] Alliin is an amino acid that does not build proteins. Alliinase has been demonstrated to be irreversibly deactivated below a pH of 3; as such, allicin is generally not produced in the body from consumed fresh or powdered garlic.[4][5][6] In light of this, Allicin is considered to be of very limited value as an oral antibiotic due to poor bioavailability.[7]
Allicin is not a very stable compound. It degrades slowly upon standing and is rapidly destroyed by cooking. Allicin can be used for some medicinal purposes: it helps fighting arteriosclerosis, it has the ability to dissolve fats and it can also be used as an antioxidant to some extent.[8][9] Other studies have shown a strong oxidative effect in the gut that can damage intestinal cells [10],[11] Vasodilative effect of garlic in physiological oxygen levels is possibly caused by catabolism of its allicin-like polysulfides to hydrogen sulfide, a reaction which could depend on reduction mediated by glutathione.[12]"
http://www.pubmedcentral.nih.gov/art...?artid=1782446
"Allicin, a major ingredient of fresh garlic extract that is produced during the crushing of garlic cloves, exerts various beneficial biological effects, including a broad spectrum of antimicrobial activity, antihyperlipidaemic and antihypertensive effects."
http://www.3dchem.com/molecules.asp?ID=156
"Being a strongly oxidising compound, it protects garlic from attack by bacteria and insects by disabling the enzymes that are found in the substrate necessary for infections to occur,"
http://www.foodengineeringmag.com/CD...00f932a8c0____
"Published articles had suggested that simply throwing cloves of garlic into the pond was helpful in promoting healthy stocks, and preliminary results from the application of allicin to fish bacteria in the lab are encouraging."
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http://www.fao.org/docrep/field/003/AC233E/AC233E06.htm
"Prevention with medicated feeds: during epidemic season of Grass carp enteritis, medicated feed is more helpful. Use 1–2 kg garlic per 100 kg of fish once a day for six consecutive days. Pulp and blend the garlic with fish feeds for feeding, preventive result would be better if 40g of table salt is added for every 5kg of food. For adult fish, mix the pulped garlic with some adhesive, and spread onto tender grass which can be applied after it is dry, or medicated feed may be given in pellet form."
http://www.geocities.com/shtinkythef...ses/garlic.htm
" Garlic has long been thought to ward off evils like vampires, disease, ect. While mostly unfounded, Garlic has many antibacterial and anti-parasitic properties, mostly derivative of its high sulfur content. It can be fed to fish nearly all fish, tropical and coldwater, freshwater, marine, and salt, to cure many parasitic infections, internal external. Internal parasites are inherently hard to treat, because of the difficulty in getting medicines into the intestines, where they occur. "
I'm suprised you being a marine bio , don't know about this.... and yea, you google skills are weak grasshopper....lol Again guys, the thing to remember is that is has to be freshly crushed or it's pretty much useless for what we are using it for.