Hello, can you enlighten me more about Micropterus?
There are many genuss' of fish, Micropterus is one of the freshwater fish in the sunfish family. 
When was it first discovered?
Well it's a pretty popular fish.  They're called black bass, and distributed throughout a large area east of the rocky mountains, all the way from Hudson bay in Canada to Mexico.  That makes it hard to say when they were first discovered.
So it's eaten in North America I would say?
been very widely introduced throughout the world, and are now considered cosmopolitan. Black bass of all species are highly sought-after game fish, and bass fishing is an extremely popular sport throughout the bass's native range. These fish are well known as strong fighters, and their meat is eaten, being quite edible and firm.
All "Micropterus" species have a dull-green base coloring with dark patterns on the sides. Most reach a maximum overall length of 40–60 cm (16–24 in), but
Micropterus
Micropterus is a genus of freshwater fish in the sunfish family (family Centrarchidae) of order Perciformes. The species of this genus are known as the black bass.
The black bass are sometimes erroneously called black trout, but the name trout more correctly refers to certain members of the salmon family.
The black bass are distributed throughout a large area east of the Rocky Mountains in North America, from the Hudson Bay basin in Canada to northeastern Mexico. Several species, notably the largemouth and smallmouth basses, have