Saturday, 27 April 2013

River Sampling - 27 April

River Granta at Abington, 27 April 2013

10.30—11.30am, cool and overcast with rain showers, river level = medium-high and fast-flowing
Stretch surveyed = 30m stretch beside Cricket Meadow (as approved by Rob Mungovan)

3-minute kick-shuffle sampling technique:
(a) 1 minute in riffle area with dark green mossy weed and large stones;
(b) 1 minute in fast-flowing stony area with light green weed;
(c) 1 minute in shallower gravel area

The following were identified from the sample:

Riverfly Partnership species (abundance code B = 10-99)
Freshwater shrimps – c. 20-30, all similar size of about 1 cm (B)
Mayfly ephemeridae 0
Blue-winged olive mayfly 25 (B)
Olive mayfly 50 (B)
Flat-bodied mayfly 0
Stoneflies 0
Caddisfly (cased and caseless) 0

Other species
Brown trout 1 – c. about 7 cm long, netted at (a) above
Beetle larvae 30
Leech 1
Snails 0
Dragonfly larvae 0
Damselfly larvae 0

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