conwyrod
Advisory Board
Autumn on the Conwy
Posts: 4,659
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Post by conwyrod on May 31, 2009 12:15:01 GMT
The June T&S magazine includes a report that grilse runs may disappear because of global warming. The north atlantic is warming up and the plankton that salmon feed on is moving further north. Salmon have to go further to find their food, or starve. There is concern that fish may not return to their home rivers, those in S England, France & Spain are perhaps at most risk. I'm not sure why this would particularly affect grilse - could it be that smaller fish would not survive the long return journey, or would they choose to stay at sea longer and not return as 1SW fish?
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Post by Willie Gunn on May 31, 2009 14:33:24 GMT
Sounds like an article written by someone with a little knowledge of salmon history. Salmon runs are somewhat cyclical and swing from a predominately Spring run to a grilse run. We are coming towards the end of the grilse cycle so I to would expect grilse numbers to drop off. P D Malloch if still alive would expect the same.
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conwyrod
Advisory Board
Autumn on the Conwy
Posts: 4,659
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Post by conwyrod on May 31, 2009 15:23:55 GMT
That's interesting Malcolm, but the report is based on the findings of a NASF study so I suspect they are well aware of any historical cyclical trend.
Is there any explanation for the historical springer/grilse cyclical swing?
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tenet
Active Member
Posts: 431
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Post by tenet on Jun 1, 2009 8:47:27 GMT
I seem to recollect that many years ago (70's I think) the T&S ran extracts from a dissertation by Tony George(?) on salmon cycles. It ran for a few months and gave rise to a lively debate in the correspondence column.
Never heard of the guy since - can anybody throw light on the subject or is it that 30 odd years on my memory is playing tricks.
Tenet
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CGFS
Active Member
ready
Posts: 277
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Post by CGFS on Jun 1, 2009 15:13:39 GMT
;)think that someting is happening we are catching mullet,redmullet,bream and char in the n/sea off shetland been 37years at sea never seen anything like this in the 70,s an odd fish like these would have been something but now very common personally think water n. here is warming up ......
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conwyrod
Advisory Board
Autumn on the Conwy
Posts: 4,659
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Post by conwyrod on Jun 1, 2009 18:02:41 GMT
CGFS - can't beat evidence like yours that changes are afoot.
We'll be catching bonefish in Wales next!
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Post by Roobarb on Jun 5, 2009 15:42:05 GMT
Does the thirty year cycle apply to all rivers or just the bigger ones that get spring, summer and autumn runs. What happens on rivers that have never had a spring run, the smaller west coast ones for example. In the past have the stocks of grilse there gone down at the same time as other rivers have seen a swing from grilse to springers.
Andy
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Post by Willie Gunn on Jun 5, 2009 16:53:23 GMT
Does the thirty year cycle apply to all rivers Andy Andy it is a sixty year cycle rather than a thirty year one.
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salmo
Advisory Board
Posts: 1,814
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Post by salmo on Jun 6, 2009 14:59:32 GMT
WG, I keep reading about these cycles and I know that they exist, but I do worry that grilse numbers are on a steady sine wave downwards Please tell me that I am being too pessimistic! salmo
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Post by Willie Gunn on Jun 6, 2009 16:41:21 GMT
WG, Please tell me that I am being too pessimistic! salmo You are being too pessimistic, you will be dead before the next grilse cycle so cheer up.
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tweedsider
Active Member
Quietness is best
Posts: 993
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Post by tweedsider on Aug 2, 2009 8:41:04 GMT
I spoke to one of the remaining Tweed netsmen last week who reported two of the skinny grilse as per season 07 but hardly seen in 08 in a recent haul of 6 fish. Incidently the seas around the Berwickshire coast have been alive with sandeels over recent weeks so no lack of feed inshore which does not mean the same situation exists on grilse feeding grounds.
Tweedsider
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Post by tweed ghillie on Aug 2, 2009 18:40:13 GMT
saturday we caught a fish no kiddin 8oz covered in sea lice. thats the smallest salmon I have ever seen, anybody seen one as BIG..
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