Chip
I used to have a handle on life, but it broke.
The trouble with life is there's no background music. :)
> -----Original Message-----
> From: Crail, Todd [SMTP:tcrail_at_northshores.com]
> Sent: Tuesday, November 26, 2002 11:16 AM
> To: nanfa_at_aquaria.net
> Subject: NANFA-- Yawning darters?
>
> It's been nice to be able to turn my head every 20 minutes or so and see
> native fish while I work. One piece of behavior I've noticed is with the
> darters (I'm currently keeping Rainbow and Blackside). They do a "yawning
> thing" long after a meal (most fish I *think* do this to purge anything
> out of
> the gills at or near feeding time). I've seen walleye and perch do the
> same
> thing at rest.
>
> 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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/-----------------------------------------------------------------------------
/"Unless stated otherwise, comments made on this list do not necessarily
/ reflect the beliefs or goals of the North American Native Fishes
/ Association"
/ This is the discussion list of the North American Native Fishes Association
/ nanfa_at_aquaria.net. To subscribe, unsubscribe, or get help, send the word
/ subscribe, unsubscribe, or help in the body (not subject) of an email to
/ nanfa-request_at_aquaria.net. For a digest version, send the command to
/ nanfa-digest-request_at_aquaria.net instead.
/ For more information about NANFA, visit our web page, http://www.nanfa.org