Crayfish Ecology & Identification

Fri, 27/07/2018 - 10:00am - 4:00pm

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Signal Crayfish- Photo credit Faye Durkin

Event details

Fri, 27/07/2018 - 10:00am - 4:00pm

This course provides an introduction to crayfish ecology and identification. We will look at the known distribution in Essex and the ecology of native and non-native crayfish species. By the end of the day participants will be able to distinguish the three species found in Essex – our native White-clawed Crayfish and the invasive Signal Crayfish and Turkish Crayfish. Participants will also be acutely aware of the risks of transferring Crayfish Plague from river to river and of measures to prevent its spread (drying/sterilising equipment, boots, nets etc.).

The native crayfish has suffered a dramatic decline in Essex in recent decades, reflecting its demise across much of the country, primarily at the hands of the alien American Signal Crayfish and the disease which they carry – Crayfish Plague. Fortunately, recent crayfish conservation in Essex has established two safe ‘Ark’ sites – a safe refuge away from non-native crayfish and disease. This year’s course will visit the donor population to these Ark sites, being one of the last remaining safe sites for White-clawed Crayfish in Essex, located on a tributary of the River Chelmer. The course on Monday 24th July 2017 provides an opportunity to monitor the health of this population and the effect of previous translocation work. Survey work will use the three main hand searching techniques – stone turning, vegetation searching and examining crayfish burrows. In the afternoon we will visit a second site populated exclusively by the American species, and examine the impacts of this aggressive invasive species on the native fauna and flora.

Venue location

Stebbing Village Hall,
Dunmow,
Essex,
CM6 3SL

Event information

Book by phone
Tel: 01621 862960
Book by email
Reception@essexwt.org.uk
Date
Friday 27th July 2018
Time
10:00am - 4:00pm
Price / Donation
Free
Audience
Adults
Suitable for 16+ years
Joining Instructions

Booking is essential. To book a place please contact us on 01621 862960 or Reception@essexwt.org.uk

Category
Training
Trust
Essex Wildlife Trust
Venue location
Stebbing Village Hall,
Dunmow,
Essex,
CM6 3SL
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Wheelchair Access
Wheelchair users please contact organiser in advance
Mobility
People with limited mobility please contact organiser in advance
What to bring
Notepad and pencil/pen - Please bring a packed lunch - Suitable outdoor clothing for site and survey work, waders if possible (otherwise wellies).

IMPORTANT!!! – To reduce the risk of transferring the lethal (for native crayfish) disease Crayfish Plague, all wellies/waders must be completely dry (sun dried >3 days) with all mud/grit removed from the sole. In addition, we will provide Virkon steriliser.
Contact details
Tel: 01621 862960
Reception@essexwt.org.uk