| 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 | nr | 19/9/25 | |||||||
| Cased Caddis | 0 | 0 | 0 | 0 | 2 | ||||||||
| Caseless Caddis | 4 | 1 | 5 | 10 | 5 | ||||||||
| Mayfly Ephemeridae | 0 | 0 | 0 | 0 | 0 | ||||||||
| Blue Winged Olive | 0 | 0 | 0 | 0 | 0 | ||||||||
| Flat Bodied Heptageniidae | 0 | 0 | 0 | 0 | 0 | ||||||||
| Olives Baetidae | 150 | 150 | 100 | 100 | 30 | ||||||||
| Stoneflies | 0 | 0 | 0 | 0 | 0 | ||||||||
| Freshwater Shrimp Gammarus | 1 | 1 | 0 | 0 | 20 | ||||||||
| Also Seen Date | 19/5/19 | 19/8/19 | 24/4/21 | 15/4/22 | nr | 19/9/25 | |||||||
| Water Slater | 200 | 200 | 150 | 150 | 20 | ||||||||
| Leech | 150 | 150 | 100 | 50 | 30 | ||||||||
| Pea Cockle | 200 | 200 | 200 | 200 | 200 | ||||||||
| River Snail | 5 | 10 | 5 | 0 | 5 | ||||||||
| Great Pond Snail | 5 | 10 | 0 | 0 | 0 | ||||||||