Question about fish behavior?

Question

I've got a few Volcano rasboras in my 55 gallon, and unfortunately I haven't been able to find a lot of info on them.  They were actually labled as "Volcano tetras" at my LFS.  The only pictures I could find are here:

http://www.rva.ne.jp/cogata/volcano_rasbora.htm

Mine are nicer-looking than that, which much more orange-red coloration on their fins, and are a little less skinny and more robust looking, but you get the idea.

I was watching them tonight, and I saw some interesting behavior.  Two of them were hovering parallel next to each other, and their fins were spread out as far as they could go.  Suddenly they moved closer until they were actually touching and starting doing a synchronized, exaggerated full-body wiggle.  This lasted for a few seconds, then the two fish swam apart.  It was pretty cool to watch.

Anyone have any idea what that was?  Territorial display, spawning behavior, etc.?  I have yet to see them do it again.

I also spotted a single fry of some sort clinging to the glass.  I've got a male and female zebra danio in there, and I saw them spawning in the willow moss a few weeks ago, so I figured it must be a danio fry, although it was twice as big as my white cloud fry are when they're in the glass-clinging stage.  The rasboras are bigger than the danios, though, so I wonder if it could be a rasbora fry?

Jason P · Accepted Answer

The only time I've observed similar behavior was with live bearers as either mating or territorial. The male would raise it's fins parallel to another male as it's territorial display, when it was mating it would be in front of or circling the female. However, the only time I've seen a full body wiggle (accurate description btw) was with guppies, and it was a mating display, not territorial.

I know it's not much and a different type of fish all together, but it's the only experience I have with such displays. Hope it helps.

Question about fish behavior?

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