100 
BULLETIN OF THE BUREAU OF FISHERIES. 
Nauplii were found in largest numbers between 3 and 6 m. Three-fourths of 
the nauplii were in this stratum, with only 9.7 per cent in the surface stratum and 
14.7 per cent in the bottom stratum. 
Only a few rotifers were obtained in the catches, the maximum number per 
cubic meter of water being noted in the 0-3 m. stratum. The algae were distributed 
throughout the lake, with the maximum number per cubic meter of water occurring 
in the surface stratum. Glceotrichia was the predominant alga, although the figures 
indicate a larger number of Microcystis and Anabaena. 
GREEN LAKE, WASH. 
This lake is only 4.5 m. (14.6 feet) deep, and the water was rather turbid, the 
disk disappearing from view at a depth of 1 m. Cyclops and Daphnia were about 
uniformly distributed from surface to bottom, but Bosmina and Diaphanosoma 
were found only in the 2-4 m. stratum. Nauplii were most abundant in the upper 
2 m. The majority of the rotifers and of the algae were obtained in the 0-2 m. 
stratum. 
LAKE KI, WASH. 
The thermocline in Lake Ki was between 7 and 9 m., and most of the Crustacea 
were below this region, with the maximum number per cubic meter of water be- 
tween 8 and 12 m. Over three-fourths of the Crustacea were Cyclops bicuspidatus, 
and two-fifths of them were between 8 and 12 m. All of the Diaphanosoma leuchten- 
bergianum and Holopedium gibberum and most of the Epischura nevadensis var. 
columbise were above the thermocline. Most of the nauplii were below the thermo- 
cline, with the maximum number per cubic meter of water between 12 and 16 m. 
The rotifers were well distributed throughout the lake, with the largest number per 
cubic meter of water between 12 and 16 m. Dinobryon was found in very limited 
numbers above 8 m. Only a small number of algae was obtained. 
LUNA LAKE, WASH. 
In Luna Lake Bosmina longirostris was the predominant crustacean in the 
epilimnion, Diaptomus oregonensis in the thermocline, and Cyclops bicuspidatus in 
the hypolimnion. The nauplii, also, were confined almost entirely to the epilimnion 
and the thermocline. Triarthra and Mastigocerca were the predominant rotifers. 
They were most abundant in the upper 8 m. The flagellate Ceratium was confined 
to the upper 8 m. Staurastrum and Asterionella were found in the 4-8 m. stratum. 
LAKE MARTHA, WASH. 
All of the Crustacea in Lake Martha were found in and above the region of the 
thermocline, the maximum number per cubic meter of water being in the 0-3 m. 
stratum. Eighty per cent of the Epischura nevadensis var. columbise, 85 per cent 
of the Diaphanosoma leuchtenbergianum, 97.5 per cent of the Holopedium gibberum , 
and 83.7 per cent of the Bosmina longispina were in this stratum. No adult Crus- 
tacea were found below 6 m. 
Nauplii were found at all depths, with the maximum number per cubic meter 
of water in the 0-3 m. stratum. All of the Conochilus and Mastigocerca, two-fifths 
of the Polyarthra platyptera, one-fourth of the Anursea cochlearis, and one-third of 
the Notholca longispina were in the 0-3 m. stratum. Ceratium and Staurastrum 
occupied the 0-6 m. stratum. 
