| Critter | Weighted Observations |
|---|---|
| Bithynia tentaculata | 12072 |
| Anisus vortex | 10980 |
| Helobdella stagnalis | 9952 |
| Cloeon dipterum | 7672 |
| Gyraulus albus | 7520 |
| Caenis horaria | 7228 |
| Bithynia leachi | 6570 |
| Bathyomphalus contortus | 6372 |
| Graptodytes pictus | 6128 |
| Lumbriculus variegatus | 6100 |
| Hydroporus palustris | 5532 |
| Hyphydrus ovatus | 5436 |
| Lymnaea stagnalis | 5392 |
| Limnodrilus hoffmeisteri | 5208 |
| Haliplus lineatocollis | 5076 |
| Laccophilus hyalinus | 4948 |
| Asellus aquaticus | 4836 |
| Erpobdella testacea | 4780 |
| Athripsodes aterrimus | 4772 |
| Lemna minor | 4688 |