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This sample was taken a short distance downstream from where we perform chemical tests each month on the quality of the water. We intend to carry out biological tests at this site on a regular basis to monitor the long term effects that water quality has on invertebrate life in the stream.
See the latest water quality test results for this location...
September 2008 The Gammaridae were heavily infested with the Echinorrhyncus parasite. This very small stream supports a varied invertebrate population with a remarkable abundance of some species.
| Location |
Great Bentley Stream – Brook Street, Cuckfield |
| Date |
16th September 2008 |
| Grid Reference |
TQ307276 |
| Notes |
Low flow, clear water, riffle and glide over clay and sparse gravel substrate. Moderate shading, copious woody debris. |
| Also netted in this sample. |
1 Bullhead and water mites.
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| Biological quality rating |
C. Fair biological quality |
| Water quality rating |
Very good |
| Species |
Group |
BMWP Score |
| Ephemeridae |
Mayfly nymphs |
10 |
| Leptophlebiidae |
Mayfly nymphs |
10 |
| Leptoceridae |
Cased caddis |
10 |
| Odontoceridae |
Cased caddis |
10 |
| Calopterigidae |
Damselfly nymphs |
8 |
| Limnephilidae |
Cased caddis |
7 |
| Gammaridae |
Shrimps |
6 |
| Hydropsychidae |
Caseless caddis |
5 |
| Elminthidae |
Riffle beetle (adult) |
5 |
| Hygrobiidae |
Screech beetle |
5 |
| Sialidae |
Alderfly larva |
4 |
| Hydrobiidae |
Snail |
3 |
| Cranefly larvae |
Tipulidae |
3 |
| Glossiphoniidae |
Leech |
3 |
| Erpobdellidae |
Leech |
3 |
| Sphaeriidae |
Mussels |
3 |
| Chironomidae |
Midge larvae |
2 |
| Oligochaeta |
Worms |
1 |
| Total Score |
98 |
| ASPT (Average Score Per Taxon) |
5.44 |
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