. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 04 < KlSIf AND GAMK If a glochidium does not attach itself to a suitable host fish, it either lodges in the stream bed and dies, or else dies while drifting in the current. Glochidia taken from mussels, and kept in culture dishes at the same temperature as the river, by suspending their container beneath the surface of the water, lived from Juno 20 to July 1 (11 days). During 1 his time the average daily temperature of
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 04 < KlSIf AND GAMK If a glochidium does not attach itself to a suitable host fish, it either lodges in the stream bed and dies, or else dies while drifting in the current. Glochidia taken from mussels, and kept in culture dishes at the same temperature as the river, by suspending their container beneath the surface of the water, lived from Juno 20 to July 1 (11 days). During 1 his time the average daily temperature of the river was ° F., and it varied from ° on June 20 to ° on July 1. In the culture dishes they, of course, did not have the benefit of well aerated river Fig. Glochidia of Truckee River mussel. The glochidia range from to mm. when released. There appears to be some difference in the susceptibility of the fishes found in the Truckee River to infection by these Of the species of fish found in the river, only brown trout (Salmo trutta) and rainbow trout (Salmo gairdnerii) were observed to be infected. Rainbow trout of 50 centimeters in length were found to be infected. Experimental infections by placing fish in pans, the water in which contained millions of glochidia taken from naturally extruded con- glutinates, produced infections in the following fish collected from the river: eastern brook trout (SalveUnus fontinalis), Tahoe sucker (Catostomus tahoensis), black minnow (Bhinichthys osculus robustus), and red-sided minnow (Richardsonius egregius). Infection could not be induced in the whitefish (Coregonus williamsoni) and the sculpin (Cottus bairdii beldingi). In all cases the fish used were under 7 centi- meters in length, and rainbow trout were concurrently infected as a control. Of the four species in which infection was experimentally effected, none was as successful a host as rainbow and brown trout. On these four only a few of
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