I cannot see why a fish needs a massive inoculation of any particular bacteria every day.
I never said "every day". A few times a week is fine as the gut bacteria does not die off in a couple of days, but it needs to be added occasionally to keep fish immune.
A. You assume quarantine kills every last pathogen. I'm skeptical that this is always true.
I do not assume that, quarantine does not kill bacteria, viruses or funguses.
It is not true in human medications so I'm not sure why fish QT processes are different. In some cases, it may just knock pathogens down to lower levels. Fish then can handle the situation just like your fish do.
Fish are not like Humans. Fish eat nothing but living foods which are loaded with bacteria and parasites as it is always raw. Their immunity depends on living gut bacteria, ours does not as we normally eat cooked foods and rarely eat raw living animals so our intake of living bacteria only comes from raw vegetables.
By the way a normal fishes diet in the sea is also composed of an enormous amount of liver oil. The liver in a fish could be 20% of the fishes weight and most of that weight is oil. Some fish use the oil in their liver for buoyancy. Dry foods offer no oil as it stinks and does not dry well.
Fresh fish also supplies calcium in a form fish can use from their bones but the most important thing fresh food offers to fish is living pathogens that fish need to stay immune. We get shots to prevent disease fish eat pathogens with every meal "unless that food is dry, manufactured food" which has no pathogens, so it offers nothing for immunity.
Over thousands of years our immune system evolved to "create" our immunity by other means but our gut bacteria also controls our immunity, just not as much as fish. (I have posted scientific articles on that)
Immunity that a fish has from the ocean does not entirely disappear in a quarantine situation.
True, but that immunity disappears eventually when you put that fish into a tank with no pathogens because it needs pathogens to maintain immunity and we also get tetanus shots, measles and others.
That is why so many fish are on the disease forum after or during quarantine.
Just look at that forum. I have never been on it.
What is your evidence that a quarantined fish that has fully recovered from the process being more susceptible to disease than is a fish straight from the ocean of otherwise equivalent health?
Read my last paragraph. A quarantined fish placed in a sterile (as per parasites) tank will eventually lose all that immunity to parasites.
No parasites mean no immunity and there is no parasites in dry foods, it is un-natural, not healthy and not needed. Fish need to eat what fish eat in the sea along with all the natural vitamins, minerals "and" pathogens.
This thread is about dry foods verses real foods and I see no benefit to the fish of dry foods except convenience. So, in my opinion, if you can't supply the fish with the proper food that they normally eat, you should not be surprised if they get sick or catch a disease from another fish you just put in.
This morning I collected and threw in my tank thousands of amphipods along with mud. I have been doing that for decades. Immune fish, eating living gut bacteria do not get sick providing some other criteria is provided.
I collected them here.
