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   xoxoxoBruce  Saturday Dec 15 12:59 PM

December 15, 2007 Great Escape



From the Telegraph
Caught in the act, Brown Trout escaping from a UK fish farm, by leaping 3 feet into an 8 inch supply pipe. They swim against the current for 30 feet, to the river that supplies water to the farm.



monster  Saturday Dec 15 01:46 PM

hope they survive in the river.

Grilled with almonds and a little fresh lemon juice should do it.



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

Quote:
Originally Posted by coolcat View Post
"instinct" what exactly is it?.... Has it been scientifically explained? ...
Quote:
Originally Posted by xoxoxoBruce View Post
A pattern of behavior, they do without knowing why. We know why but they don't.
Also, a pattern that is not learned after birth but is programmed in, innately. Chicks imprinting on the first big moving thing they see is an example.
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.

Morie
check out my website: www.anthology.page.tl



classicman  Sunday Dec 16 12:31 PM

Quote:
Originally Posted by xoxoxoBruce View Post
Not everything, that gets a whiff of something strange, runs away from home.
not something strange...SOME strange. At least, thats the way I read it.


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.

But it's not like they don't have all day to keep trying.



xoxoxoBruce  Sunday Dec 16 12:56 PM

Quote:
Originally Posted by classicman View Post
not something strange...SOME strange. At least, thats the way I read it.
Yeah, that's what I meant, your wording is more gooder.


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

Quote:
Originally Posted by TheMercenary View Post
How do we know that the fish aren't just being spit out of the pipe backwards?
The fish look pretty calm, so I think they're swimming upstream. If they were coming out backwards, they would look scared as hell...


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