7614

• UCREFRP Catalog Number: 7614
• Author: Valdez, R. A.
• Title: Cataract Canyon Trip Report No. 2 -- Assess Reproductive Activity of Humpback Chub -- ‎(April 11-16, 1988)‎.
• USFW Year: 1988.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

.

.

temperatures of 13-17 C and flows of 34,000-58,000 cfs; spawning in 1984
occurred at 21-23 C and 22,000.-11,000 cfs. Since Cataract Canyon is downstream
of Black Rocks about 140 river miles, it was felt that the water would warm
earlier and possibly provide spawning conditions for humpbacks before runoff.
Also, from the size of suspected YOY humpbacks captured in Cataract Canyon, it
is believed that spawning occurs relatively early, compared to other regions
upstream, such as Black Rocks.

.

Objectives

.

The objective of this tri.p was to assess spawning condition of humpback
chub in Cataract Canyon to enable the area to be designed as a "confirmed
spawning area".

TRIP DETAILS

.

The following are the details of logistics and personnel for trip no. 2:

Dates (launch to takeout): April 11-16, 1988

Launch Site: Potash, RM 46 - Colorado River

.

Takeout Site: Hite Marina, Lake Powell

Personnel: Total of six people (2 BOR, 2 B/W, 2 Boatmen)

.

Camp Sites: Location River Mile
1 Above Rapid 3 CO-211.7
2 Above Rapid 11 CO-207.2
3 Lower Cataract La.ke CO-205.9
4 Imperial Canyon CO-200.1

Date

4-12-88

4-13-88

4-14-88

.

4-15-88

RESULTS

.

Sample Effort and Fish Captured

The following tables summarize the results of trip no. 2. Table 1 is a
summary of sampling effort by gear type; Table 2 presents the catch composition
by species; Table 3 is a summary of endangered fish; and Table 4 is a list of
endangered fish captured.

.

2

.