Register now on PaFlyFish.com! Login
HOME FORUM BLOG PHOTOS LINKS


Sponsors

Browsing this Thread:   1 Anonymous Users



« 1 (2)


Re: What happens to all the fish...

Joined:
2007/1/2 11:55
From Bozeman
Posts: 19932
Offline
Quote:

wsender wrote:
Also, the water velocity at the bottom is significantly lower then at the top or in the main channel. Trout can just lie against the bottom, and exert very little effort, even during high water events.


Yep. Watch underwater videos of trout feeding. They sit on the bottom, seemingly effortlessly in some very fast water. They only appear to expend effort when they move into the main flow to grab a meal. Big searching flies don't just work in fast water because they are easier to notice in the turbulent flows... they also work because the reward for working so hard for a meal has to be higher.

Posted on: 2011/8/31 23:23


Re: What happens to all the fish...

Joined:
2006/9/14 20:03
Posts: 258
Offline
Couple years ago I read a academic paper on fluid dynamics, partially funded by the defense department, where they measured the energy expenditure of swimming trout. The surprising result was as current velocity increased, trout used less energy to maintain position. Apparently in slow water, they had to work their fins and gills much harder to stay in place. As the current increased, their swimming efficiency increased as well.

The extra oxygen available from more water passing through the gills was not enough to account for the results. They went on to show the aerodynamic shape and sinusoidal body motion allowed trout to maintain position in a current while barely using its fins. Somewhat like a bird flying into the wind without flapping its wings.

Posted on: 2011/9/1 2:44
_________________
That money talks
I won't deny.
I heard it once.
it said, "Goodbye."
Richard Armour


Re: What happens to all the fish...

Joined:
2011/3/31 12:18
From Clearfield
Posts: 2490
Offline
It is amazing how efficient nature is.

Posted on: 2011/9/1 7:48
_________________
www.theavocations.blogspot.com


Re: What happens to all the fish...

Joined:
2010/8/9 16:23
Posts: 3364
Offline
Trout are really incredible when they're in their lies. I believe there is a video out there called "Trout Lies" or something to that affect and it's about an hour and change of great underwater footage of trout in a variety of lies. There is even footage showing that trout can move forward against current without using their tails and only manipulating their pectoral, dorsal, and anal fins. It's really quite remarkable.

Also, that video sheds a lot of light on to the whole 'adipose fin is useless' debate. It's worth the watch.

Posted on: 2011/9/1 8:57


Re: What happens to all the fish...

Joined:
2011/8/15 15:02
From Bethlehem, PA
Posts: 117
Offline
The stream I fish the most, the Saucon Creek, gets hammered by high water every year. Usually at least one of the events is not unlike Irene the other day. The stream gets very far out of it's banks. Trees fall; some are washed down. Pools are scoured out or filled in; new channels appear. I've never known that to have much effect on the stream. Despite the high water events and the number of people that frequent it, whether fishermen or picnickers, I've been very successful there over the years and continue to call it my "home" water.

Posted on: 2011/9/1 12:08
_________________

The fisherman: He ariseth early in the morning and awaketh the entire household. He arriveth home late at night, smelling of strong drink and the truth is not in him.


Re: What happens to all the fish...
Moderator
Joined:
2006/9/9 9:29
From Monessen, PA
Posts: 22117
Offline
Nature is resilient; and though we shouldn't lose our concern for some of these precious resources, Mother Nature is rarely, if ever, their enemy.

Posted on: 2011/9/1 17:29
_________________
I don't like spinach, and I'm glad I don't, because if I liked it I'd eat it, and I just hate it. --Clarence Darrow


Re: What happens to all the fish...

Joined:
2009/4/22 22:42
From Southwest, Pa
Posts: 98
Offline
Quote:

JackM wrote:
Nature is resilient; and though we shouldn't lose our concern for some of these precious resources, Mother Nature is rarely, if ever, their enemy.


That's an awesome quote!

If I should recognize it, I don't. If that's your own, well done!

Posted on: 2011/10/5 10:00



« 1 (2)



You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.

[Advanced Search]





Site Content
Login
Username:

Password:

Remember me



Lost Password?

Register now!
Stay Connected

twitterfeed.com facebook instagram RSS Feed

Sponsors
Polls





Copyright 2014 by PaFlyFish.com | Privacy Policy| Provided by Kile Media Group | Design by 7dana.com