90 
BULLETIN OF THE BUREAU OF FISHERIES. 
The deepest water (67 m.) was found in the center of the southern basin, 
about a mile out from McCall, Idaho. The narrows, which was reported very 
deep, proved to be 45 m. in depth. A mile farther up, the north basin reached a 
depth of 62 m., beyond which the depth gradually decreased. The variation in 
level was reported as 8 feet and is controlled by a dam, the water being used for 
power purposes. 
Payette is noted for its Rocky Mountain . whitefish ( Coregonus williamsoni) , 
which are taken in large numbers each fall. It also furnishes good trout fishing, 
the silver trout ( Salmo gibbsii ) being one of the species for which it is noted. 
The catches of net plankton were all made in the deepest place found in the 
lake. The thermocline was near the surface in the 4-7 m. stratum. 
Diaptomus constituted 51 per cent of the total number of Crustacea, and 70 
per cent of them were found in the 0-5 m. stratum, or directly above the thermo- 
Fig. 13. — Curves for Newman Lake, giving the temperature, dissolved gases, and plankton conditions in a typical shallow 
lake. C, free carbon dioxide; Cb, fixed carbon dioxide; 0, oxygen; each given in cc. per liter. Plankton numbers are 
per cubic meter of water. 
cline. (See Table 12, p. 129.) Cyclops bicolor was well distributed throughout the 
lake, but 74 per cent were in and above the thermocline and only 3 per cent were 
found in the 60-65 m. stratum. Daphnia hyalina was found in about the same 
abundance as Cyclops, but it was confined to the upper 15 m. of water. As a 
whole, the Crustacea were especially prominent in the upper portion of the lake. 
It will be noted that they numbered 43,000 individuals per cubic meter of water 
in the 0-5 m. stratum. They decreased to 19,000 in the 5-10 m. stratum and to 
7,000 in the 10-15 m. stratum. Below 30 m. the number was less than 1.000 per 
cubic meter of water. 
With the exception of Anuraea aculeata all of the Rotifera were below 20 m. 
The maximum number of Triarthra per cubic meter of water was found in the 20-25 
m. stratum, and this form was uniformly distributed below this depth. Notholca 
and Mastigocerca were found only in the 40-45 m. stratum. 
The algae were most abundant in the 0-5 m. stratum. In this region the 
diatoms numbered 430 and the other for ms 1,060 per cubic meter of water. 
