sick fish -- I need advice (fish koi spot green large)
Veterinarians treating large fish like koi always inject or treat with
antibiotics in the food. Much as with you and I, the fishes circulation
will deliver the antibiotic where needed. Fish can also absorb some
antibiotics through the skin and gill membranes, so for small fish that
refuse food, it's worth trying adding antibiotic to the water.
Nitrofurazone and kanamycin are two I can think of off the top of my
head that are absorbed - there are others. However, fish do not recieve
as strong a dose, a lot of the antibiotic breaks down in the water and
is lost, and you often damage your biofiltration which causes other
problems.
The other BIG problem with adding antibiotics to the water is that you
tend to raise antibiotic resistant bacteria in your fishtank. This is
particularly true of aquarists who use antibiotics frequently and switch
medicines after a few days when one doesn't work. There is at least one
very well-do***ented case of an aquarist becoming infected with
antibiotic resistant Mycobacterium marinum.
For visible external physical damage, preventing infection by dabbing
the injury with either an antibiotic cream/ointment like neosporin or a
bacteriostatic like mercurichrome is ideal. Again, you want to
concentrate the medicine at the wound. Dabbing malachite green onto a
wound that has fungused works exremely well. Diffuse external
infections like flexibacter often respond to bacteriostatics like
potassium permanganate or acriflavine which don't lead to drug resistance.
<soapbox>
So, why are all these antibiotics for tank water on the market? First,
they do sometimes work. But mostly, the pet fish industry is not
regulated at all, so caveat emptor applies. As long as a fish store
employee will recommend a packet of capsules for a sich fish and someone
buys them, they will stay be on the shelves. That attitude has also led
to the popularity of inadequately tested "natural" remedies like pimafix
and melafix, products that cause algae problems like pH down,
ineffective nitrifying bacterial products, and "kitchen-sink" water
treatments rather than simple dechlorinator.
I try very hard to stick to recommending antibiotics in food for fish
that are still eating or spot-treatments for wounds. I think it's far
more effective and safer for the aquarist.
</spoapbox> ;-)
BTW, keep us posted on how your fish is doing. I'm rooting for him!
-- Elaine T __
http://eethomp.com/fish.html <'__><
rec.aquaria.* FAQ http://faq.thekrib.com
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