The gravel chub, present only at the lower and middle Neosho stations,
occupied moderate currents over clean (free of silt) gravel bottom. The
gravel chub was not taken in 1957, was rare at both Neosho stations in
1958, became common at the lower Neosho station in part of 1959, but was
never numerous at the middle Neosho station. Dr. F. B. Cross recorded
the species as "rare" in 1952 at a collection site near my middle Neosho
station, but larger numbers were taken then than in any of my
collections at that station. The population was probably reduced by
drought, and recovery was comparatively slow following restoration of
flow.
Young-of-the-year and adults were common in collections from riffles at
the lower Neosho station from 1 July through 8 July, 1959. I obtained
only one specimen in intensive collections in the same area on 25, 26,
and 27 August. Seemingly the species had moved off shallow riffles into
areas not sampled effectively by seining.
#Phenacobius mirabilis# (Girard)