Rooksbury data

	2003	2004	2005	2006	2007		2008			2009
					14/06	10/07	21/5	25/6	1/7	25/06	7/07
All Caddis	0.9	0.4	2.2		1.3	0.0	5.0	8.8	3.8	3.8	1.3
damselfly	4.4	5.1	4		5.0	6.3	3.8	2.5	2.5	2.5	1.3
Diving Beetle	1.5	1.7	1.7		1.3	1.3	2.5	2.5	2.5	1.9	1.3
Dragonflies	1.2	0	0.5		4.4	2.5	0.0	1.3	0.0	0.6	0.0
Freshwater Shrimp	6.8	7.5	5.8		10.0	8.8	29.6	38.8	2.5	34.6	5.0
Hoglouse	1.8	5.6	7.5		2.5	7.5	17.8	28.0	46.3	60.0	10.0
Lesser Water Boatman					2.5	0.0	0.0	0.0	5.0	1.9	2.5
Mayfly nymph	2.1	1	1.6		2.5	2.5	1.3	2.5	0.0	1.9	0.0
Waterflea - Daphnia	8.5	13.9	101.1		23.0	23.6	131.3	150.0	112.5	65.9	78.8

The data below has been gathered during school visits. A typical collecting day consists of 4 sessions. 6 groups of children in each session collect from the water using nets with 1 mm mesh. These are sorted through in white trays and a selection of animals taken from the trays and put into smaller pots. Animals from all trays are used to compile a list for the day. Towards the end of the session, each group estimates the numbers of particular animal types in their tray. The numbers shown below are intended to show the contents of a typical tray from the sampling effort of all visits for the years 2003 - 2005 and for each day visit for 2007 - 2008. No quantitative data was recorded in 2006.

Although there is considerable variation in the collecting effort and accuracy of each group, the number of repetitions does provide a degree of validity to the data, at least with respect to observing trends, and this is the main reason for gathering the data.

Animals recorded during the school visits

	21_05_08	25_6_08	1_07_08	25_06_09	07_07_09

Flatworm	a	a		a	a
Lumbriculus	a				a
Fish Leech - Piscicola	a			a
Leech - Theromyzon		a	a		a
Leech - Erpobdella				a
Snail - Bythinia		a	a	a	a
Bladder Snail				a
Great Pond Snail	a	a	a		a
Ramshorn Snail	a	a	a	a	a
Orb Shell	a	a		a	a
Waterflea - Daphnia	a	a	a	a	a
Waterflea - Cyclops	a	a		a	a
Freshwater Shrimp	a	a	a	a	a
Hog-louse	a	a		a	a
Mayfly	a	a		a
Hawker Dragonfly		a
Darter Dragonfly		a		a
Damselfly	a	a	a	a	a
Water Measurer	a
Pond Skater		a	a	a	a
Water Scorpion	a			a
Water Stick-insect		a	a	a
Saucer bug�		a
Greater Waterboatman	a	a	a	a	a
Lesser Waterboatman		a	a	a	a
Caddis - stick case	a	a	a	a
Caddis - stone case		a	a	a
Caddis - green leaf case	a	a			a
Alderfly				a
Phantom Midge				a	a
Bloodworm	a	a		a
Non-biting Midge			a
Whirligig Beetle
Diving Beetle - Dytiscidae		a	a	a	a
Beetle - Haliplus			a	a
Diving Beetle -Platambus	a
Diving Beetle - Hyphydrus	a				a
Fish Fry	a			a	a
Pike	a
Common Toad	a				a
Common Frog	a