| Riverflies: This is a formal survey following
specific criteria that allows a "score" derived. This is then a measure of the river's health, which can be used to monitor the river and compare with national standards. MCG volunteers conduct the survey a few times during the year and submit the results. For more information go to http://riverflies.org/rp-riverfly-monitoring-initiative |
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| Category Date | 19/5/19 | 19/8/19 | 24/4/21 | 15/4/22 | 2023 nr | ||||||||
| Cased Caddis | 0 | 0 | 0 | 0 | |||||||||
| Caseless Caddis | 4 | 1 | 5 | 10 | |||||||||
| Mayfly Ephemeridae | 0 | 0 | 0 | 0 | |||||||||
| Blue Winged Olive | 0 | 0 | 0 | 0 | |||||||||
| Flat Bodied Heptageniidae | 0 | 0 | 0 | 0 | |||||||||
| Olives Baetidae | 150 | 150 | 100 | 100 | |||||||||
| Stoneflies | 0 | 0 | 0 | 0 | |||||||||
| Freshwater Shrimp Gammarus | 1 | 1 | 0 | 0 | |||||||||
| Also Seen Date | 19/5/19 | 19/8/19 | 24/4/21 | 15/4/22 | |||||||||
| Water Slater | 200 | 200 | 150 | 150 | |||||||||
| Leech | 150 | 150 | 100 | 50 | |||||||||
| Pea Cockle | 200 | 200 | 200 | 200 | |||||||||
| River Snail | 5 | 10 | 5 | 0 | |||||||||
| Great Pond Snail | 5 | 10 | 0 | 0 | |||||||||