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Hi Paul, David;
fish ladders can have their problems, but overall they are better than =
no fish ladders. All the new Ducks Unlimited engineered marsh dams have =
them, and there is a major program in the European Union to retrofit old =
low-head dams with them. And, for example, they have saved the gaspereau =
run (and the associated commercial fishery) on the Gaspereau River.
About fish migration in darkness: It is my understanding that most, =
if not all, anadromous fish species will not move through a fish ladder =
(or through a culvert) if it is dark. I have read of fish ladders =
equipped with lights. I understand that some fish species, such as the =
sturgeons, are extremely reluctant to use them. =20
Dusan Soudek =20
----- Original Message -----=20
From: Paul MacDonald=20
To: naturens@chebucto.ns.ca=20
Sent: Friday, June 15, 2012 7:19 AM
Subject: Re: [NatureNS] Evening on the River
Fish ladders have been very unsuccessful Dave.
I suspect its difficult to get enough water through them to attract =
the=20
fish where the flow from the main current is much greater.
They are also subject to poaching.=20
All in all, a difficult sell in whatever design.
Enjoy the day
Paul
-------------------------------------------------------------------------=
-----
From: David & Alison Webster <dwebster@glinx.com>
To: naturens@chebucto.ns.ca=20
Sent: Thursday, June 14, 2012 8:36:59 PM
Subject: Re: [NatureNS] Evening on the River
Hi John & All, June 14, 2012
On the topic of water, I think there will be a need for a cheap =
but functional fish ladder design for low dams and speculated on Nature =
NS about a possible snail design.
When discussing this with a member of an Agricultural Water =
Committee a few years ago I was shot down at once by the observation =
that Trout will not enter a structure if it is dark inside.
Is it in fact correct that Trout will not enter a dark structure ? =
=20
Yt, Dave Webster, Kentville
=20
----- Original Message -----=20
From: John and Nhung=20
To: naturens@chebucto.ns.ca=20
Sent: Thursday, June 14, 2012 8:34 AM
Subject: RE: [NatureNS] Evening on the River
Really appreciate your observations, Paul.
Want to add a disquieting appendix: I=E2=80=99m on the Climate =
change Action Plan committee for Yarmouth. I=E2=80=99m told we should =
anticipate warmer, wetter winters, and hotter, drier summers, in future. =
Weather in current and recent years seem to back that up.
We=E2=80=99d better start taking rain water storage more seriously!
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Paul MacDonald
Sent: June-14-12 8:16 AM
To: Nature NS
Subject: [NatureNS] Evening on the River
Hi All
Last evening we went for a paddle on the river.
Beautiful evening and the east wind was kind enough to be quite as =
the sun=20
went down and the river was still. The water level is lower than we =
ever saw last summer
and its only mid-June. But the paddling was easy.
At sundown the river herring started to take flies of the surface. =
10 - 12 could be seen at once.
They are heading out to sea and are hungry after all the efforts of =
spawning.
An Eagle was sitting up on a tree - looked like a second year lad. =
She/he was wanting
kippers for dinner and as the herring were on the surface no doubt =
would have one.
The eagle had an escort of grackles and blackbirds on the trees =
nearby. As we watched
a small hawk came shooting by - looked like a Sharpshin but it was =
so fast hard to tell.
A grackle had the misfortunate of being flying around at the time. =
The hawk gave chase
and they went across the river but the grackle wasn't up to the task =
and as the hawk grabbed
it, both disappeared into the grass on the far side. I doubt he =
baked it in a pie.
I don't know if the hawk had learned to hunt near eagles or no. The =
grackles would be distracted
and provide easy targets but thats how it worked.
Just as we were leaving a salmon jumped a bit down river. Sort of =
the signature
to a very pleasant evening - for us at least if not some of natures =
creatures.
Have a nice spring
Paul
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<DIV><FONT size=3D4>Hi Paul, David;</FONT></DIV>
<DIV><FONT size=3D4> fish ladders can have their problems, but =
overall they=20
are better than no fish ladders. All the new Ducks Unlimited engineered =
marsh=20
dams have them, and there is a major program in the European Union =
to=20
retrofit old low-head dams with them. And, for example, they have saved =
the=20
gaspereau run (and the associated commercial fishery) on the Gaspereau=20
River.</FONT></DIV>
<DIV><FONT size=3D4> About fish migration in darkness: It is =
my=20
understanding that most, if not all, anadromous fish species will not =
move=20
through a fish ladder (or through a culvert) if it is dark. I =
have=20
read of fish ladders equipped with lights. I understand that some fish =
species,=20
such as the sturgeons, are extremely reluctant to use=20
them. </FONT></DIV>
<DIV><FONT size=3D4> Dusan Soudek </FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Dpaulrita2001@yahoo.com =
href=3D"mailto:paulrita2001@yahoo.com">Paul=20
MacDonald</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dna