7067

• UCREFRP Catalog Number: 7067
• Author: Banks, J. L.
• Title: Fish Species Distribution in Dinosaur National Monument During 1961 and 1962.
• USFW Year: 1964.
• USFW - Doc Type: Master's Thesis.
• Copyright Material: NO

~

7

I

t;
f,
~:~7
t~' )

seinea from 40 to 60 teet in length and from 4 to 6 feet in depth were
used to sample some of the slow water areas on both the Green and Yampa
river. (Figura 1). These devices could be used onlY'during the October
tield operations when manpower was sufficient to make their use praotical.
Nylon experimental gill nets, 100 feet in length, 5 teet in
depth, with variable 3/l~ ... 2-1noh mesh wero used uhen river oonditione

parmi. ttod. I:r1 a:idi tion, tlu',,h3 standard nylon gill nets were used during
the S\l1lllIlGr investigations. One \las 75 feat in length, 5 teet in depth,
and had J/4-inoh mesh. The remaining tllO wore 100 teet long, 5 feet

deep, and had l~...inoh mesh. Gill nets Here anohored on or near the

stream bank with the domlstream end free, thus al1ol-dng them to lie

parallel to shore. Net sets aoross the current were 1mpossib1e because

they were soon buried or broken by large quantities ot silt and debris
washing downstream.
EJJmlsified rotenone 01' 5% oonoentration was used twioe to

oollect fish in side channels, and at the IllOuth of a small tributary

stream in Echo Park. mock nets inoreased effectiveness by' eliminating

routes at escape. Fish collections were also made as a result at the

etfects at rotenone and its oxidizer escaping from the upstream

eradication project during September, 1962.

All fish oollected were placed in oontainers containing a
lO~ formalin solution and transported to Colorado state University

tor study.

Field operations

Field operations consisted at three intensive sampling
excursions by field crews .f'rom Colorado state University, and a SUDUller