About Black Mayfly
A dark color variant of the common Green Drake mayfly found in some European populations. The dark form is more prevalent in upland, acidic waters. Important for trout feeding.
Did You Know?
The dark form predominates in acidic upland streams while the typical yellow form prefers alkaline lowland rivers.
Distribution
Where Black Mayfly can be found
Seasonal Activity
Peak activity
Moderate
Low / dormant
Cite This Page
APA:
Orbitrock. (2026). Black Mayfly (Ephemera danica var. nigra). Retrieved from https://orbitrock.com/insect/black-mayfly
MLA:
"Black Mayfly." Orbitrock, https://orbitrock.com/insect/black-mayfly.