7331

• UCREFRP Catalog Number: 7331
• Author: Kinnear, B. S. and R. E. Vincent.
• Title: Fishes and Fish Habitats in Black Canyon of the Gunnison National Monument.
• USFW Year: 1967.
• USFW - Doc Type: Fort Collins, Colorado.
• Copyright Material: NO

6
Five river habitat types were arbitrarily named and described be-
cause measurement of physical characteristics such as velocity, depth,
width, or height of fall rarely was possible. These types are:
CATARACT Broken water - gradient or force of current
over or around an obstruction eliminates
standing waves (Figure 2).
RAPIDS Broken water - generally with regular
cresting, standing waves caused by chan-
nel constriction, submerged or protruding
obstructions, or gradient (Figure 3).
RUN Smooth surface - current flows in center
of stream and/or eddies compose less than
one-third of stream width (Figure 4).
RIFFLE Surface broken - water depth is "shallow"
(Figure 5).
POOL Smooth surface - main current flows to
one side of center and/or eddies compose
more than one-third of stream width
(Figure 6).
Location and length of each type was marked on a map. The percen-
tage of each type was derived by dividing the total length of each type
by the stream length.
Data on water chemistry were derived from Wiltzius (1966) and Mor-
gan (1959).
BIOLOGICAL DATA
Biological data consist of fish species identification, distribu-
O
tion, age and condition determination, aquatic plant samples, and aqua-
tic insect samples.
Fish samples were collected with: 1) variable mesh gill-nets, 2)
electro-fishing units, 3) set lines, 4) rod and reel, and 5) seines.
o
Gill-nets were 125 feet by 6 feet and were divided into five sec-
tions of one inch, one and one quarter inch, one and one-half inch, one
and three-quarters inch, two inch square mesh. The nets were set in