View Full Version : koi with black spots

06-17-2011, 02:48 PM
Hey so i have Comets in 2 different tanks they came from the same place (bait store) and last few days 1 fish from both tanks have started getting a lot of black spots. what i have read is that it might be ammonia burn? but 1 out of 10 has it in my 45 gal aquarium and 1 out of 40 in the 250gal FT. a little help?

06-17-2011, 03:18 PM
does not look good!

what are your readings? ph, ammonia, nitrite and nitrate?

have you salted?

have you done a water change?

what are your volumes? ft, gb.. any extra filtration?

06-17-2011, 04:02 PM
This fish is in a 45 gal aquarium.. With a rena filter.. Have don1/3 water change. The other is 250 ft with 55 gallon biofilter then a55 gal clarification barrel. Then into 225 gallons of gb..

06-17-2011, 04:04 PM
I will check levels as soon as I get home..

06-17-2011, 04:22 PM
It may be just the photo, but the fins are burned on the closest one and the one behind it has a whitish film on its body. This is real common with feeders they have been shipped in super crowded conditions and it could be chemical burn, bacterial, or fungal. But if it holds true it will move very fast.the problem is you can not use chemicals because you want to produce food.

06-17-2011, 04:31 PM
this has developed after 2 weeks of them being in the tank.. i can use chems in the aquarium, i am not producing from it.

06-17-2011, 05:48 PM
great, you're lucky, furazone green works well for many different things.
if it appears to be parasitic use Clout.

06-17-2011, 06:57 PM
Typical symptoms of goldfish and koi diseases. ... BLACK SPOTS The most common cause of black spotting on fish is transient ammonia spikes.

Black spots in goldfish, koi , and other coldwater fish often occur as a result of ammonia surges in the water. The black spots can appear on the side or back of your fish. Frequent partial water changes will help to correct this condition and the color on the goldfish should return to normal within a few weeks.

I raise KOI so, take it from one who knows.:mrgreen:

06-18-2011, 07:28 PM
in the AP FT the levels are

ammonia .50 kinda high
ph 6.0
alk 40
hardness 75
Ni 0.5
Na 0

any help with my new system is helpful.

06-19-2011, 10:26 PM
Poor guy died in the aquarium.. The one in the ft its still alive

06-20-2011, 12:06 AM
Just some very basic information here:

Black spot is the name given to either of two goldfish illnesses:

1) In fact the first one isn't a goldfish illness at all, it is the sign of healing from injury caused by ammonia, rough handling, low pH, skin flukes or goldfish ick, and can appear on the skin or fins.

It is important to note that the black spots will not appear until the problem is removed and the skin begins to heal. This type of black spot usually disappears within 7 days.

2) The second type of black spot is a parasitic goldfish illness. Pond goldfish and those living in aquariums with snails are more at risk. Small black or brown spots about 2mm in diameter appear anywhere on the goldfish, including the mouth. They contain the larvae of parasitic flukes. Consult a pet shop or vet on the best anti-parasitic medicine for this goldfish illness if it becomes a problem.

Even after the tank and fish are free from the parasite, this type of black spot can remain on the goldfish as a scar.

SOURCE: http://www.happy-goldfish.com/black_spot.php