As nouns the difference between fishfly and dobsonfly
is that fishfly is (canada) a mayfly while dobsonfly is an insect of the subfamily whose males have long mandibles, found in the americas and related most closely to the fishfly.
fishfly
English
Noun
(fishflies)
(Canada) A mayfly. dobsonfly
English
Noun
(
dobsonflies)
(
wikipedia dobsonfly)
An insect of the subfamily whose males have long mandibles, found in the Americas and related most closely to the fishfly.