xoxoxoBruce Saturday Dec 15 12:59 PM
December 15, 2007 Great Escape
monster Saturday Dec 15 01:46 PM
hope they survive in the river.
coolcat Sunday Dec 16 12:24 AM
"instinct" what exactly is it?.... Has it been scientifically explained? ...
xoxoxoBruce Sunday Dec 16 02:15 AM
A pattern of behavior, they do without knowing why. We know why but they don't.
ZenGum Sunday Dec 16 02:59 AM
I've seen some "explanations" that I didn't really understand but which seemed to me to work for very simple behaviours.
For example, caterpillars that always climb up branches are in fact climbing towards the light. Boffins like to mess with them by putting light bulbs at the bottom of grass stems and watching them climb down. (with lights at either end and a toggle switch, they have hours of fun...)
Anyway it turns out that if one of the caterpillar's eyes is receiving more light than the other, this sends a signal which inhibits (slows) the movement of legs on that side of the caterpillar's body. Just like with a tank, one side moving slower than the other means it turns, in this case, toward the light.
It is an open question, just how far this sort of behaviour can go in terms of complexity. For these fish, some mechanism to make them "swim into the current" seems quite possible.
Elspode Sunday Dec 16 04:07 AM
Are we pretty sure that they don't just somehow smell that there's some strange wherever that water's coming from? That would really simplify all the speculation.
xoxoxoBruce Sunday Dec 16 07:20 AM
Not everything, that gets a whiff of something strange, runs away from home.
morie Sunday Dec 16 10:01 AM
hope they aren't genetically modified trout. then again, it's probably too late to think about that.
classicman Sunday Dec 16 12:31 PM
Fish were designed to swim UPstream or into currents. But these trout, much like salmon, are still amazing to me.
Happy Monkey Sunday Dec 16 12:48 PM
Their normal behavior is to swim upstream to mate, jumping up waterfalls along the way. They've already explored the whole pool, and the only "upstream" is the pipe, which is nothing more than a particularly tricky waterfall to jump.
xoxoxoBruce Sunday Dec 16 12:56 PM
TheMercenary Sunday Dec 16 05:08 PM
How do we know that the fish aren't just being spit out of the pipe backwards?
Gravdigr Monday Dec 17 01:44 AM
When I first saw the pic, I hadn't read the story and thought it was a sewer pipe. I had this crazy mental image of some motherly English type sitting on a toilet, then letting out a whoop as a foot long brown trout tried to continue "swimming upstream". If you're picking up what I'm laying down...
Gravdigr Monday Dec 17 01:47 AM