Observations in the Species: Pacifastacus leniusculus
English Name: Signal Crayfish
By: bobthebirder
Observed on: 15th June 2013
Added to iSpot: 15th June 2013
Identifications: 1
Agreements: 1
Comments: 0
Description: Photo taken by Katy Haines at the 2013 Havering bioblitz
Observed on: 26th March 2013
Added to iSpot: 27th March 2013
Identifications: 1
Agreements: 7
Comments: 2
Description: This is the introduced American crayfish that has caused so much harm to our native species. Quite a large one, too.
Unfortunately it looks like this means the end of the British crayfish in this river - it was caught less than a mile from the source of this chalk stream.
Another example of a species introduced for financial advantage turning out to be a disaster. I'd like to ask the idiots who brought it to Britain what the hell they were thinking of. I hope they feel really, really guilty.
Observed on: 14th October 2012
Added to iSpot: 14th October 2012
Identifications: 1
Agreements: 0
Comments: 0
Description: Our work party today fished this out with the rubbish from the Anton
By: lavateraguy
Observed on: 29th September 2012
Added to iSpot: 4th October 2012
Identifications: 1
Agreements: 0
Comments: 0
Observed on: 9th September 2012
Added to iSpot: 10th September 2012
Identifications: 1
Agreements: 2
Comments: 0
Description: Crayfish in shallow water where cattle had trampled the riverbank.
By: KittieKat
Observed on: 5th June 2012
Added to iSpot: 7th June 2012
Identifications: 1
Agreements: 4
Comments: 1
Observed on: 1st June 2012
Added to iSpot: 3rd June 2012
Identifications: 1
Agreements: 1
Comments: 0
Description: These pictures are of two individuals, dismembered and scattered in the same general area. There was at least one more. So what got them? Two obvious suspects - otter or mink. It's possible that it was a bird, perhaps a heron, though.
They were all Signal Crayfish, I'm afraid.
I've selected the habitat 'freshwater', though they were on the path. Whether they came from the nearby canal or the flooded pit isn't known.
Location: River CherwellLat/Lng: 51.9359, -1.2982
OS grid ref: SP483266
Approximate location
Close Observed on: 9th April 2012
Added to iSpot: 9th April 2012
Identifications: 1
Agreements: 5
Comments: 0
Description: Trapped under EA licence in the river Cherwell
By: MonkeyPuzzle
Location: MorpethLat/Lng: 55.16, -1.70
OS grid ref: NZ1985
Close Observed on: 18th November 2011
Added to iSpot: 11th February 2012
Identifications: 2
Agreements: 0
Comments: 0
Description: Being moved under Natural England licence
By: allrounder
Observed on: 3rd June 2011
Added to iSpot: 27th December 2011
Identifications: 3
Agreements: 5
Comments: 7
Description: Found while paddling in the river with the kids(just up from the Cavendish Pavilion) at Bolton Abbey
By: Martint
Observed on: 4th October 2011
Added to iSpot: 4th October 2011
Identifications: 1
Agreements: 0
Comments: 2
Description: Thornton Beck, a tributary of the River Nidd, flows through my garden near Harrogate and supports a thriving population of American crayfish. I came across this smaller specimen on the rocks and wondred who attacked it. I discount herons, since it was within 3 metres of the kitchen window and was partly sheltered by overhanging vegetation - the hole in the carapace is too neat. There are reports of otter (?) and mink in the area - or was it simply rats?
Location: CaldecotteLat/Lng: 52.014194900551, -0.70984125137329
OS grid ref: SP886358
Approximate location for various observations
Close Observed on: 3rd October 2008
Added to iSpot: 3rd October 2008
Identifications: 2
Agreements: 1
Comments: 2
Description: I found this empty carapace on a pile of weed dredged from the lake
