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  #551  
Old 03-04-2017, 01:29 PM
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Default Re: The (new) River Wye 2017 thread.

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Originally Posted by Cranefly View Post
but still having a healthy grayling and trout population?
and... Who decides what constitutes a 'healthy' population? There are long stretches of river with hardly a sniff of a fish (of any species) therein, and other, fewer, areas thick with fish.
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  #552  
Old 03-04-2017, 01:46 PM
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Default Re: The (new) River Wye 2017 thread.

I know they aren't Atlantic salmon - but the Fraser River fish in BC during the early 90s - and likely still today - used to produce runs of 25 million fish. That's just the sockeye salmon. There are half a dozen other sepcies too. At the same time, the Fraser River was castigated in the press as being the dirtiest river in the northern hemisphere.
This colours my views on if clarity is really an issue.
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  #553  
Old 03-04-2017, 01:47 PM
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Default Re: The (new) River Wye 2017 thread.

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Originally Posted by geoffmaynard View Post
and... Who decides what constitutes a 'healthy' population? There are long stretches of river with hardly a sniff of a fish (of any species) therein, and other, fewer, areas thick with fish.
Mapping those areas of no fish would be useful information to help determine the reason why. maybe run off issues at those locations ? Maybe not enough to affect the river as a whole but enough to cause unlivable habitat within ' x ' amount of distance below the source ? it would be interesting to isolate these areas.
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  #554  
Old 03-04-2017, 01:55 PM
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Default Re: The (new) River Wye 2017 thread.

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Originally Posted by geoffmaynard View Post
and... Who decides what constitutes a 'healthy' population? There are long stretches of river with hardly a sniff of a fish (of any species) therein, and other, fewer, areas thick with fish.
I was quoting Midway. As Dryline said it would be very useful to map the areas of abundance and lacking fish.
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  #555  
Old 03-04-2017, 01:55 PM
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Default Re: The (new) River Wye 2017 thread.

We have electrofishing figures for a lot of the upper main river and main tribs of the Wye and the 50% decline in fry and parr seems to be pretty widespread.

http://www.wyesalmon.com/wp-content/...ary-2016-1.pdf
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Last edited by stealth_fox; 03-04-2017 at 01:59 PM.
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  #556  
Old 03-04-2017, 01:59 PM
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Default Re: The (new) River Wye 2017 thread.

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Originally Posted by dryline View Post
Mapping those areas of no fish would be useful information to help determine the reason why
Well it's not rocket science. Bank craft will do. Given a period of clear low water; The fishy bits are generally those with deeps and features and weeds, sunken trees etc, places where the fish can hide from the predators. The shallow clear glides will be either devoid of fish or holding very small fingerlings not worth a predators effort. Dispersal of fish is predator-driven in clear shallow water. All IMHO of course
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  #557  
Old 03-04-2017, 03:57 PM
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Default Re: The (new) River Wye 2017 thread.

Quote:
Originally Posted by geoffmaynard View Post
Well it's not rocket science. Bank craft will do. Given a period of clear low water; The fishy bits are generally those with deeps and features and weeds, sunken trees etc, places where the fish can hide from the predators. The shallow clear glides will be either devoid of fish or holding very small fingerlings not worth a predators effort. Dispersal of fish is predator-driven in clear shallow water. All IMHO of course
Areas with good habitat hold fish - I think we can all agree with that.

I thought, and I suspect Dryline too, that you were referring to miles of river without a sniff of fish rather than relatively short lengths of poor habitat.
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  #558  
Old 03-04-2017, 04:09 PM
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Default Re: The (new) River Wye 2017 thread.

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Originally Posted by Cranefly View Post
Midway, how do you square the circle of implying salmon juvenile numbers are adversely affected by a massive FEB problem but still having a healthy grayling and trout population?
Fair question - I would guess there is a higher number of savvy trout and grayling already in place.
Parr are easy pickings for FEBs (and anglers - I've caught one more parr than wbt this season, which is to say, one).
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  #559  
Old 03-04-2017, 04:19 PM
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Default Re: The (new) River Wye 2017 thread.

The older "savvy" trout and grayling were young once too!
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  #560  
Old 03-04-2017, 04:30 PM
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Default Re: The (new) River Wye 2017 thread.

From the available evidence it does seem that the overall 50% fall in the salmon fry and parr population isn't mirrored in the Brown Trout population. Are there any notable 'cool spots' for trout Cranefly?
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