| Specimen ID | 272667 |
| Group | Fishes |
| Genus | Gambusia |
| Species | affinis |
| Common Name | Western Mosquitofish |
| State | CA |
| County | Humboldt |
| Locality | Mad River, backwater area on the north side 200 meters west of Highway 101 bridge |
| Mapping Accuracy | Accurate |
| HUC8 Name | Mad-Redwood |
| HUC8 Number | 18010102 |
| HUC10 Name | Lower Mad River |
| HUC10 Number | 1801010204 |
| HUC12 Name | Mill Creek-Mad River |
| HUC12 Number | 180101020408 |
| Map | |
| Collection Day | 18 |
| Collection Month | 8 |
| Collection Year | 2010 |
| Year Accuracy | Actual |
| Potential Pathway | stocked for biocontrol |
| Status | established |
| Comments | second sighting in this area, however not seen since |
| Record Type | NAS sighting report |
| Freshwater/Marine | Freshwater |
| Number Collected | 1 |
