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Danio and Barilius in an open tank - bound to fail?
July 11, 2015
9:32 pm
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oaken
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I've been thinking of setting up a tank with some Barilius and I was considering adding some Danionins as well. Now, I have embarassingly little experience with both of these genera, but I have understood that they are quite prone to jump - at least if startled. So do people reckon it would be impossible to keep fish from these genera in an open top tank without them winding up on the floor?

July 12, 2015
5:01 am
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BillT
Eugene, Oregon
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Large and mid-sized danionins are certainly jumpers.

Floating plants inhibit their jumping out.

Lack of scarey stimuli (sudden noises, light changes, movements) also helps. Some tanks I have visually screened to keep them more calm.

Bill Trevarrow [email protected]
July 12, 2015
5:14 pm
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Byron Hosking
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In addition to what BillT mentioned, I would be most concerned over what might happen during darkness.  This is when I have had fish jump out, when I have inadvertently left the cover open just two inches.  During darkness, other fish in the tank may startle a fish, and it jumps as a reflex action.  If the water level is well down from the top this might work as far as fish jumping.

Personally, I do not recommend open top tanks at all.  Water evaporation is a major issue, and not just thinking about water leaving the tank but where do you think it is going?  Into the structure of the room.  Then there is dust that enters the tank, and this can be more significant than you might think.  Tank water temperature will also fluctuate more without a cover, which in some cases such as during warm spells may not be detrimental but in others such as fish that need warm air above the surface, not so good.

Byron.

Byron Hosking, BMus, MA Vancouver, BC Canada
July 12, 2015
6:25 pm
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oaken
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Thanks for your answers. 

Byron, I'm not too concerned about water evaparation as the air inside modern apartments is usually too dry anyway. As for fish that need warm air, I'm not planning to keep any such species or species that would suffer from temperature fluctuation (temperature fluctuation is not really a problem for me either, but anyway). With the fish mentioned the addition of cover would probably make them suffer temperature wise more than anything else.

As far as dust goes, it's an interesting point I haven't thought much about but surely the filter should take care of this? I haven't noticed any issues with this with other open tanks that I have that are without filtration as well.

The reason for wanting an open tank is I think that it adds another dimension to the tank, but of course choice of fish has to be adapted accordingly.

July 13, 2015
5:42 pm
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Matt
Málaga, Spain
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Personally never had an issue with Barilius jumping, although only kept B. canarensis and the tank did have a cover.

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