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Re: Summer Doldrums

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Re: Summer Doldrums In reply to
Carl wrote:
Great story Jeff!

Is there any insight on why the fishway is not working as designed??


Lots of theories. It's not just shad it does not work for, but also alewife and blueback herring.

It seems to be better for Atlantic salmon (57 passed as of June 20 this year), but there are still some big inefficiencies.

One clear problem is the shape of the dam, which results in an attraction flow to the river left side of the dam during periods of high flow (like May and early June when alewife, bluebacks, shad, and salmon are all on the move). The fishway is on river right, and the dam is L-shaped such that fish attracted to spill on river left are ~1500' upstream of the fishway attraction flow on the other side of the river. So they beat themselves up on the ledges below the dam trying to find a passage that does not exist.

But shad have poor passage at dams everywhere on the east coast. Every historic shad river that has had a dam removed has seen rapid increase in shad numbers as soon as the dam was gone and fish could access upstream habitat. The same has not been true when fishways were constructed, and that includes fishways of many different types. Some pass more shad than others, but none of them come close to passing enough shad for meaningful restoration of upstream habitat, especially on rivers where they need to pass more than one dam.

There is a reason the undammed Hudson, Delaware, and Potomac--and now the lower Kennebec, up to the first dam--are the best shad fisheries in the Mid Atlantic and Northeast. All the other large rivers that formerly supported big shad runs--especially the Connecticut and the Susquehenna--have multiple dams. A few fish pass the first dam; fewer pass the second; and when you get to upstream habitat the numbers are very small.

"At first blush I am tempted to conclude that a satisfactory hobby must be in large degree useless, inefficient, laborious, or irrelevant."
— Aldo Leopold
Subject Author Views Date
Thread Summer Doldrums Carl 1649 May 27, 2022, 5:13 AM
Thread Re: Summer Doldrums
Rod VanZile 1582 May 27, 2022, 5:43 AM
Post Re: Summer Doldrums
Carl 1525 May 27, 2022, 1:17 PM
Thread Re: Summer Doldrums
Dani 1536 May 27, 2022, 12:07 PM
Post Re: Summer Doldrums
Nick Zito 1473 May 28, 2022, 8:35 AM
Thread Re: Summer Doldrums
Dale Wilcox 1287 Jun 27, 2022, 6:00 AM
Thread Re: Summer Doldrums
Jeff Reardon 1274 Jun 27, 2022, 7:50 AM
Thread Re: Summer Doldrums
Carl 1269 Jun 27, 2022, 8:48 AM
Thread Re: Summer Doldrums
Jeff Reardon 1268 Jun 27, 2022, 9:07 AM
Post Re: Summer Doldrums
Rossja 1252 Jun 27, 2022, 10:23 AM
Thread Re: Summer Doldrums
Carl 1210 Jun 27, 2022, 5:02 PM
Thread Re: Summer Doldrums
Jeff Reardon 1207 Jun 27, 2022, 5:14 PM
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greg setter 1198 Jun 27, 2022, 6:07 PM
Post Re: Summer Doldrums
Jeff Reardon 1190 Jun 27, 2022, 6:50 PM
Thread Re: Summer Doldrums
Carl 1156 Jun 28, 2022, 5:01 AM
Thread Re: Summer Doldrums
Vince Pagliaroli 1143 Jun 28, 2022, 7:22 AM
Thread Re: Summer Doldrums
greg setter 1102 Jun 28, 2022, 6:32 PM
Thread Re: Summer Doldrums
greg setter 1101 Jun 28, 2022, 6:46 PM
Thread Re: Summer Doldrums
Jeff Reardon 1066 Jun 29, 2022, 5:41 AM
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Vince Pagliaroli 1057 Jun 29, 2022, 6:34 AM
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James Woods 1038 Jun 29, 2022, 8:20 AM
Thread Re: Summer Doldrums
Jeff Reardon 1035 Jun 29, 2022, 8:30 AM
Thread Re: Summer Doldrums
Dani 699 Jun 29, 2022, 9:46 AM
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tod osier 686 Jun 29, 2022, 2:18 PM
Thread Re: Summer Doldrums
Jeff Reardon 680 Jun 29, 2022, 3:38 PM
Thread Re: Summer Doldrums
tod osier 676 Jun 29, 2022, 3:56 PM
Thread Re: Summer Doldrums
Jeff Reardon 675 Jun 29, 2022, 4:04 PM
Thread Re: Summer Doldrums
greg setter 658 Jun 29, 2022, 7:34 PM
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Jeff Reardon 637 Jun 30, 2022, 6:50 AM
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Carl 636 Jun 30, 2022, 7:14 AM
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rfberan 689 Jun 29, 2022, 12:57 PM
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Carl 1071 Jun 29, 2022, 4:55 AM
Thread Re: Summer Doldrums
Troy Fields 624 Jun 30, 2022, 9:26 AM
Post Re: Summer Doldrums
Jeff Reardon 611 Jun 30, 2022, 12:13 PM
Post Re: Summer Doldrums
Carl 1266 Jun 27, 2022, 8:51 AM
Post Re: Summer Doldrums
Huntindave McCann 1239 Jun 27, 2022, 11:19 AM
Thread Re: Summer Doldrums: Finally got out fishing.
Carl 542 Jul 2, 2022, 11:34 AM
Post Re: Summer Doldrums: Finally got out fishing.
greg setter 422 Jul 9, 2022, 6:16 AM