Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
The Au Sable was not always a trout stream. Before about 1890, grayling
were the sport fish of the Au Sable system. Early lumbermen called the
grayling "white trout" or "Crawford County trout", but in 1874 the fish were
identified as grayling. Local residents then changed the name of their
town from Crawford to Grayling. The first brook trout to enter the Au
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Sable system reportedly were taken from the Jordan River and planted in
the East Branch of the Au Sable by Rube Babbit in the 1880's. Rainbow
trout had been planted somewhat earlier and browns came shortly after.
Grayling became scarce soon after the trout appeared, but few of the oldtime
residents blame the trout for this. Apparently the grayling was less
tolerant to changing conditions than the trout, and it is doubtful if the
grayling could have survived even if trout had not entered the river. The
last grayling reported caught in the Au Sable mainstream was taken by
Dan Stephan in 1908 about three miles above McMasters Bridge.
My opinion is that brook trout are the prettiest and the strongest of the three we catch the most of.