Otto question

alexv1n

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Jan 10, 2003
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Ottawa, ON, Canada
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The other day I decided to get some Otto cats to keep algae in check. I went to an LFS and bought 3 ottos whom I placed in a quarantine tank.

I kind of made a mistake when introducing them to the tank because I wasn't very patient and after floating the plastic bag for half an hour I have added some aquarium water to it and about ten minutes later I put the fish in the tank.

Well, I didn't do my fair amount of research and wasn't aware that these fish are really easy to stress when putting in a new environment. Anyway, after about 20 minutes I noticed that the fish "stood" on their fins. Their bodies seemed very tense and then after about another 5 minutes they started to swim franticly, going up and down along the glass.

In the end, one fish was dead maybe within 1 hour upon introduction. Oh, I must note that I took the water from the main tank which has been running OK for 2 months now with perfect water quality parameters (as far as I can tell from my test equipment) - Ammonia (0), Nitrite (0), Nitrate (0), Phosphates (0), pH (7.2), KH (4°dH), GH (6°dH).

I have removed the dead otto and the remaining two appeared to be in shock but breathing. They survived through the night and the next morning I discovered that both have some sort of spine deformities. One fish had some apparent bend in the spine while the other had kind of "S" shaped bend. I have replaced the dead fish with a new otto I got and I acclimatized it properly this time and it seemed to be doing OK initially.

Anyway, two days later the three aren't still very active. Lying most of the time or hanging by the glass. They do seem to eat from time to time. The otto with "S" curved spine seemed to have straightened up and now appears normal. However the second "bent" otto, even though straight now, has some kind of inflamation on the body. The whole part from the dorsal fin to the tail is reddish and slightly swollen.

I suspect that they could have been hurt at LFS when being netted but I don't dismiss the possibility of disease. From what I've read, the only disease which usually causes spinal deformities is TB. I hope that's not the case.

The fish is still eating a little bit and sometimes swim around, but mostly lie down. Sometimes some of them even could lie on its side, almost belly-up. But then a few minutes later turns up and acts normal.

I'm kind of concerned and I'm even considering destroying them, disinfecting the tank and get some other fish (like CAEs). Any ideas or suggestions as to what I should do before I freeze those poor things. I like the fish's looks and smaller size but I have recently read a lot of horror stories about keeping ottos and them dying like flies...
 
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From my experience with ottos in three different tanks, the following describes "normal" behavior patterns:
- they freak out easily and dash around when startled
- their normal state is hanging on the side of the glass or hiding in plants
- they eat nothing but brown algae and algae wafers (usually at night only)

Within my population of 9 ottos, there exists a few 'deformities', but the fish seem to be doing alright and acting normally. I know someone with a flying fox with the big hump back you describe and it has lasted for months so far in that state.

I'm sure someone more knowledgeable can suggest some medical situations for you, but I thought I'd add my two cents. Good luck.
 
I bought 3 otos on July 29 and they are all still alive and well, but I agree with Winnie on their behavior, they still freak out easily. Mine also eat zucchini.

You do not mention, does your q-tank have plants, either real or fake, whatever? They do not like to be out in the open, for sure, maybe that is why they are so stressed.
 
You do not mention, does your q-tank have plants, either real or fake, whatever? They do not like to be out in the open, for sure, maybe that is why they are so stressed.

It's a small (5.5g) tank that has no plants, however I built a small cave out of stones so they can hide...
 
You know what? I think you should just go ahead and move them to their permanent residence. I think they probably feel exposed where they are. There are assorted opinions about Q. tanks - I think with ottos you might as well put them where they are gonna be. Mine never approach the rocks/cave; they head for plants or the glass or even the glass behind the filter or heater.
 
Winnie,

I'd gladly do that but I'm concerned about the possible disease they might have. Especially the one with the red tail. It does look inflamed even though the skin is OK. The reddish tissue appears to be under the skin. The whole tail half of the body is considerably reddish and appear to be slighly swollen. Too bad I don't have a digital camera. It would have been so much easier to show this. I decided to get a photo of the fish from a web site and just color it to resemble what I have. See the attachment (image courtesy http://www.aquahobby.com/gallery/goto.html).

Also the previous deformities of their spines frighten me somehow (all the fish are "straight" now :)) I just fear they might have tuberculosis or something. I just don't want to infect my main (55g) tank.

oto.jpg
 
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Somehow, if you want to keep them, you'll have to make them more comfortable in their q-tank. Get some dark paper and cover the sides of the tank as well (assuming the back already is). Maybe find something else to put in the tank for hiding, something tall/vertical. You could buy just one tall bushy plastic plant and place it right in front center. If you bought some black plastic needlepoint canvas (Wal-Mart, craft stores), you could make a lean-to against the back wall for them to hide behind. You could still see and watch them around the plant and through the holes in the canvas.

I don't really know anything about the redness, sorry, but that was a great job on colouring the picture.
 
I have already made some minor changes to the tank. I added a bush of Ceratophyllum submersum. I know that's probably not the kind of plant otos would appreciate but I had it spare. I did have the back glass covered with black paper.

I have a 15W incandescent light which might be too bright for the small tank and the fish, so I'll replace it with the original incandescent hood with one bulb (25W).

I also have an undergravel filter I pulled from a 1 gal "kid" tank, filled it with wool and use so far as a filter media in q-tank. So, it's black plastic that covers approx 1/4 of the bottom with the tube and airstone, so the otos use it to hide as well.

Maybe I'll dig a wide-leaved plant from the main tank and drop it in the Q.

Anyway, two fish behave OK (including the "red tail" one) but the one I added last doesn't seem to feel too well. It frequently rests on its side, sometimes swims in spiral or even spins along its head-tail axis while swimming forward (observed this today). Looks kind of disoriented.

They try to eat the remnants of the brown algae I had in the tank and today even ate some dried algae tablet.

I don't think they have TB because all have straighten up and have no "broken spine syndrom". My guess is that they were just too stressed out and their muscles were tense making the spine bend weirdly (plus all their fins were sticking out to extremes). Now they look much more relaxed but still not quite healthy enough...

I'll observe them a little while and will let you know if I find out anything.

In meanwhile, do you have any suggestions on their diet, frequency of feeding, etc. I have never had herbivorous fish before, so pardon my ignorance.
 
Ok, sad news.

Today in the morning the "red tail" oto was dead. I had a pronounced sharp bent spine. I guess he was just able to keep his body straight when alive. He must have some spinal injury after all (hence the swollen red body). Parts of the fishes body and eyes were covered with some kind of white slime, I'm not sure what it was.

Another oto (the "disoriented" one) was still disoriented, swimming randomly, having difficulty staying afloat and constantly falling to the bottom lending on its side or even belly up. I decided to euthanize it to prevent from suffering.

So, I'm left with only one oto which so far seems OK, but who knows what happens tomorrow :(
 
Sorry about your oto losses. Here's a dumb question, but I wonder if the one remaining is the last one you acclimated slower? They do like to be in groups so I don't know if you want to try a couple more, if it's worth one more stab at aggravation for you.

Mine like to nibble on zucchini. I boil and cool half-circles to make it quite soft, then anchor them with a veggie clip. I recently tried a piece of broccoli stem prepared the same and they were hanging all over it when I turned the lights on in the morning, before they went bonkers (OMG! The light's on! Run for your lives!). Frequency depends on availability of algae in your tank, I guess. I have 3 and I supplement twice a week, once with a small piece of algae tablet and the other with the veggie.
 
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