Another foul and wet day, no good to man nor beast (except salmon). The river is not quite in spate, but too high and coloured for decent trout fishing. The forecast is for more of the same tomorrow with a brief respite on Friday before more rain returns at the weekend. So Friday looks as though it may be a decent salmon day.
There has been a flurry of correspondence in the angling community recently about the impact of non native crayfish on salmon and trout recruitment. This is something that has concerned me and I have been banging on about for a couple of years now and it's good to see anglers at last waking up to the threat pose by non native crayfish to our riverine ecology.
We are currently encouraging the S&TA, Environment Agency and others to consider funding research on the Wharfe into the impact of signal predation on salmonids and it is likely that a meeting will take place soon to discuss the proposal.
It may be too late to save the Wharfe which is heavily infested with signal crayfish; however, the research may save other northern rivers from becoming devoid of salmonids and other fish.
Ian
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Re: 7 September 2011
by
Chris Smith
on Thu 08 Sep 2011 18:32 BST | Permanent Link
Hi Ian, I don't know if you have come across this paper in your research but I thought it might be interesting if not? http://www.snh.gov.uk/docs/C209049.pdf
I wouldn't wish to add yet more gloom to the picture but whilst pondering a simplistic question about if Signals are such bad news in our waterways, what is their impact in their native America. I never got the answer because I was distracted by the disturbing discovery that native species (including Signals) were under threat from a yet more aggressive species called the Rusty Crayfish (Orconectes Rusticus). This species was previously to the West (Ohio and environs) but has exploded all the way across the States to New England in recent years. We can only hope that this particular species does not find its way across the pond and into our waterways. Regards Chris Smith Best wishes Chris Smith |
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