NOTES OX LAKE TAHOE, ITS TROUT AND TROUT-FISHING. 



141 



In the littoral region, the following Cladocera were found: llyocryptus acutifrons 

 Sars, E/urycercus lamellatus O. F. Miiller, Acroperus harpa Baird, Alona affinis 

 Leydig, Chydwus xphsericus O. F. Miiller. 



Epischura and Diaptmnus deserted the upper 5 feet of water on bright, sunny 

 days, but both came to the surface at night. The latter was very abundant at the 

 surface at night. Dapknia hyalina descended to a depth of 40 feet during the day- 

 time, but came to the surface at night. Dapknia pulex descended to a depth of 50 

 feel in the daytime. l>ut was found at the surface at night. The two Daphnia were 

 found this near the surface in the daytime only in the shallower water, where the 

 transparency was only about 52 feet. In the deeper water, where the transparency 

 was greater by 13 feet, neither form was found in catches thai did not reach a depth 

 of 75 feet. Thus the diurnal migration of 1>. hyalina was at least 40 feel in the 

 shallower, less transparent water and about 75 feet in the deeper, mole transparent 

 w:tter. while l>. pulex showed a daily migration of 50 to 75 feet. These migrations 

 were greater than any noted for these forms in Wisconsin lake- or in Winona Lake. 

 Indiana. In these instances the maximum movement of D. hyalina was only 22 

 feet and of D. pulex a little less than W feet (Juday, L903 and L904). 



THE TROl I OF I. AKK TAHOE. 



Spedef^sise, abundance, etc. Onlytwo kinds of troul are caught in any consider- 

 able numbers. These are Srrlmo /« nshawi (< >ill <& Jordan), w hich has several common 

 names, such as Lake Tahoe trout. Truckee trout, pogy, and snipe; and also Salmo 

 tahoensis (Jordan <& Evermann), which is commonly called the silver trout of Lake 

 Tahoe. Locally, the males of the former are frequently called redfish becau e they 

 have copper-colored sides during the breeding season. 



The Tahoe trout, or pogy, is caughl chiefly alone- t he western side of the lake and 

 at the south end. A large area extending soul h a few miles from ( >bservatory Poinl 

 seems to be a good feeding ground for them, and this is the favorite fishing ground 

 of the anglers located in the vicinity of Tahoe City. Silver trout are mosl abundant 

 in the northeastern pari of lake, in Crystal Mas and Sand Harbor, bul a ivw are 

 caught in other parts. The Tahoe troul is caughl in much greater abundance than the 

 silver trout, hut it does not attain such a large size. The former rarely exceeds 

 a weight of six pounds, while specimen- of the latter ha\ e been caught which exceeded 

 this weight by several pounds. The following measurements and weights of trout 

 caught in Lake Tahoe are given by Treat (1904, p. 866), who does not, however, 

 indicate the species he measured and weighed: 



Some year- ago the Mackinaw trout, Orisiivomer namaycu&h (Walbaum), was 



introduced, and examples of it are caught occasionally in the southern part of the 

 lake. During the season of It»o:3. a 10-pound trout of tin- species was caught in the 

 vicinity of Glenbrook. 



