7071

• UCREFRP Catalog Number: 7071
• Author: Bosley, C.
• Title: Pre-Impoundment Study of the Flaming Gorge Reservoir.
• USFW Year: 1960.
• USFW - Doc Type: Cheyenne.
• Copyright Material: NO

-49-
Original plans had been made to use kokanee eggs spawned at .Fremont-Lake,
in Wyoming, so a close check .could be maintained on eyeing, and incubation
~ period. Fiowev~er, spawning concentrations did not materialize as anticipated
and eggs from the State of Montana were used. The date these eggs were taken
and the time spent incubating9 before planting9 was not .known. It is esti-
mated that 80 to 90~ of the incubation time had been completed. The time these
eggs remained in the stream was considerably less than those of the brown trout
because of the advanced stage of development.
The following information was accumulated on this plant. of kokanee eggs.
Eggs Taken-------------------------------------- ?
Size ------------------------------------------- 260/ oz
Amt. of incubation completed at time of plant-=- Est. 80oto 90%
t
Planting Basket Size ___________________________ g~ x 3~ x 12 inches
Planting Box ___________________________________ 16 x 16 x 25 inches
_ I~okanee Salmon Eyed 7E~~ Experiment - TABLE X
~ ~ .Basket No, 1 Basket.No. 2
Date Planted January 199 1959 January 19, 1959
Date Removed March 69 1959 March 14, 1959
Days in River 46 53
Number Eggs in Basket 19000 500
Number Eggs Recovered 511 436
Number Eggs Alive 219 182
% Survival of Eggs Recovered 42.8% 41.7%
% Eggs Lost and Dead .48,9% 12,8%
The percentage of eggs lost and dead is larger in the kokanee eggs than in
the brawn trout eggs, This loss is explained in part by two conditions
(1) The advanced stage of development in the kokanee eggs when they were
planted.
Hatching had taken place in the kokanee eggs between the time they
were planted and recovered. In Basket No. 1, 5.9% of the recovery
was alevin. In Basket No. 2, 15.8% of the recovery was alevin. It
is felt that while buried in the redd, a number of eggs hatched
and the alevin escaped through the basket mesh. In transporting
the baskets into town for enumeration, it was noted that a number
of alevin had passed through the basket mesh into the tub of water
in which the basket was being transported.
(2) Rust from the wire mesh used in construction of the baskets.
During enumeration, it was noted that a large number of eggs had
adhered to the sides of the baskets. These eggs, when removed,