I wondered if anyone knew if this is to increase water flow/aeration over the
gills, like a barracuda "yawns" when they're at leisure?
Or is it suggestable they do this as a display? For example, the Austrl/PNG
rainbowfish I keep do a similar thing, but they do this whole head bobbing
thing. The blackside (if male) doesn't have anyone else to show off for,
unless it's into that inter-species kind of thing... ;) So I'm not really sure
this is the case.
Does anyone know any papers that have studied this? It would be interesting
to note if this is an adaptation that is normal or under stress, and if I'm
not supplying enough dissolved O2 :)
Thanks in advance!
Todd
http://www.farmertodd.com
I hope you know that this will go down on your permanent record.
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