Large Dark Olive Mayfly vs March Brown Mayfly
Side-by-side species comparison
| Attribute | Large Dark Olive Mayfly | March Brown Mayfly |
|---|---|---|
| Scientific Name | Baetis rhodani | Rhithrogena germanica |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Baetidae | Heptageniidae |
| Size | 6-10 mm | 10-14 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | Europe | Europe |
| Conservation | Least Concern | Near Threatened |
Large Dark Olive Mayfly
The most common European mayfly, emerging year-round in many rivers. It is a small olive-brown species that serves as a staple food for stream fish.
Did You Know?
This mayfly can produce up to three generations per year, making it available as fish food in every season.
March Brown Mayfly
A spring-emerging mayfly with a brownish body and two tails, historically important to European fly fishing. Its flat nymphs cling to rocks in fast water.
Did You Know?
This species has declined significantly in many European rivers due to pollution and is now considered an indicator of water quality.