River Sampling - 12 August 2014

We met at 18:30 to sample at our usual site near the cricket nets.

This is what we recorded:

Organisation: Abington Naturewatch

Site name: Cricket Pitch Reach, Abington, Cambridge

River: Granta

Grid ref:

Monitoring Group Coordinator: Rob Mungovan

Date: 12 August 2014

Recorded by: Anne Dunbar-Nobes and Peter Brunning

Cased caddisfly:  Nil

Caseless caddisfly:  Nil

Mayfly Ephemeridae:  Nil

Blue-winged olive: Category B, Estimated number 20

Flat bodied up-wings:  Nil

Olives: Category C, Estimated number 120 (all very small)

Stoneflies: Nil

Gammarus (Freshwater shrimp): Category B, Estimated number 35

River low; overcast, windy, cool evening (6.30pm); three kick-shuffles undertaken within the allotted 3 minutes

1. stones/rocks on bottom, small amount of weed; 
2. large stones/gravel shallow area;
3. in main river flow over stoney bottom.

Note: now the reach is so shady, and recent heavy rainfall has increased the flow and removed the weed and riffles, there is very little variation within our 30 metre stretch – no silty areas or  thick weed beds.

Hatches seen: none

Other fauna: Signal crayfish (5); tiny leech, red hairworms (2)

Non-catches: water snails, fish, beetle larvae

Hairworm

Shrimp (Gammarus)

Signal Crayfish