| Common name | Trico's - Caenie Hatch - Tiny White-winged Black - Black Caenis |
| Genus / species | Tricorythodes |
| Nymph type | Crawlers |
| Emergence | Late June - October waters temps. 52-56 |
| Prefferd nymph habitat | Sand and gravel bottoms - Mar-rich silt - Subaquatic weed beds |
| Nymph Size | 3 - 5mm |
| Tails | 3 long |
| Nymph Tied | thin |
| Nymph Most active | Morrning |
| Recommended Nymph Patterns | pheasant tial size 20 - 26 |
| Emerger Pattern | wet size 28-26 |
| Dun Pattern | dark body light wing #24 #26 |
| Spinner Pattern | Rusty spinner - trico cdc spinner |
| Streams identified in | West Branch Croton Falls Spillway July 1 |