River Sampling - 19 April 2014

Saturday 19 April 2014, 1600—1700, sunny but cool

River Granta at Abington, Grid Ref: TL534490

River level = medium, strong flow

Recorder: Anne Dunbar-Nobes

Cased caddis = 0

Caseless caddis = 3 -- Category A

Mayfly ephemeridae = 1 – Category A

Blue-winged olive mayfly = 0

Flat-bodied mayfly = 0

Olive mayfly (Baetidae) = c. 70 – Category B

Stoneflies = 0

Freshwater shrimps (Gammarus) = 8 (widely varying in size from a few millimetres to 1 cm) -- Category A

No other species found in the sample apart from lots of miniscule hairworms.

Jennifer took these photos:

Caseless Caddis larvae

Caseless Caddis larvae

Freshwater shrimps (Gammarus)

Mayfly (ephemeridae) 

Small specimens of Olive mayflies (Baetidae)