74 
BULLETIN OF THE BUREAU OF FISHERIES. 
for lake trout. In the deeper lakes it is hoped that the lake trout may be more 
carefully planted and the results watched. 
Since writing the above in 1914 this report has been delayed and it seemed best 
to check up the catches of Mackinaw trout to 1921. A letter from R. A. Laird, of 
the Spokane Chamber of Commerce, sums it up as follows: 
Mackinaw trout continue to be caught in Deer and Loon Lakes, also at Badger Lake, located 18 
miles southwest of Spokane. The supply continues to be fairly plentiful. The largest Mackinaw that 
I heard of being taken in Loon Lake in 1920 weighed 26 pounds. The largest Mackinaw taken from 
Deer Lake last year to my knowledge weighed 21 pounds. Mackinaws from Badger Lake appear to 
be smaller, running from 8 to 10 pounds. I have never heard of Mackinaws being captured in Coeur 
d’Alene, Pend Oreille, Priest, or Sullivan Lakes. 
A similar letter from A1 Wiesman, of Spokane, verifies the above, and he 
adds that he does not think that as many Mackinaws were caught in 1920 as other 
years. Several letters from Idaho fail to report a single catch in Coeur d’Alene or 
Pend Oreille Lakes. 
Badger Lake, mentioned in Mr. Laird’s letter, is a small lake located 2 \ miles 
almost north of Williams Lake. It is much higher and, at high water drains into 
Williams Lake. It was not mentioned as a trout lake when we were there, and we 
haye no data on it. 
Deer, Loon, and Badger Lakes are all small. Deer Lake is 25 m. deep; Loon, 
32. There is not a large supply of oxygen at the bottom in late summer. They 
are very similar to Trout, Little Trout, and Black Oak Lakes in northern Wisconsin, 
in which Mackinaw trout were native. 
FISH FOOD IN CERTAIN LAKES. 
BEAR LAKE, IDAHO. 
One blue-nosed trout ( Salmo virginalis ) was obtained from this lake. The 
stomach was well filled with smaller fish, which proved to be whitefish ( Coregonus 
williamsoni ) . It was found that the fish had also eaten a few mayflies (Ephemerida) , 
beetles (Coleoptera) , and ants (Hymenoptera) . The fishermen around the lake 
said that all of the stomachs of the blue-nosed trout were filled with the small 
whitefish. 
Four whitefish stomachs were secured, and they were fairly well filled with 
food. One contained mayflies (Ephemerida) entirely; two others contained 75 
per cent mayflies (Ephemerida) and 25 per cent midges (Chironomidse) ; the fourth 
contained 45 per cent mayflies, 45 per cent midges, and 10 per cent snails, bees, 
and clams. From this rather brief investigation it appears that the fish, both large 
and small, were not feeding directly on Crustacea at this time of the year. 
HENRY LAKE, IDAHO. 
At this lake, trout ( Salmo clarJcii) were abundant and the food supply of 
Crustacea was almost unlimited. Three trout, each 40 cm. in length, were obtained. 
The stomachs of two of the specimens were well filled; from 80 to 90 per cent of the 
material consisted of well preserved amphipods, about 5 per cent of mayflies 
(Ephemerida), and the remainder of a small quantity of beetles (Coleoptera), dragon 
flies (Odonata), ants (Hymenoptera), and a few Daphnias. The third stomach 
