444 
BULLETIN OF THE BUREAU OF FISHERIES 
In figure 4 a portion of a chart (from U. S. Coast and Geodetic Survey, chart no. 
6460) is reproduced to show the general contours of the most important bays in which 
Olympia oysters are cultivated. All of the observations here described were made in 
the area illustrated. The most extensive and successful grounds are in Totten Inlet, 
commonly called Oyster Bay. Mud Bay (Eld Inlet) is next in importance. Oakland 
Bay and Little Skook- 
um (Skookum Inlet) 
also contain important 
grounds, but during 
the last few years, since 
a pulp mill began op- 
eration in the vicinity, 
they have been almost 
entirely out of produc- 
tion. (See Hopkins, 
Galtroff,and McMillin, 
19151 ; Hopkins, 1931a). 
The location of culti- 
vated grounds is indi- 
caled on the chart. 
These are on the mud 
flats in the upper ends 
of the bays and on the 
relatively narrow 
beaches along the 
shores adjoining deep 
water. Altogether 
there are only some- 
thing like 400 to 500 
acresof producing 
grounds. Budd Inlet, 
on which Olympia is 
located, originally con- 
tained widespread beds 
of natural oysters, but 
has been condemned 
on account of sewage 
pollution. 
TEMPERATURE 
Figure 4. — General contours of oyster-producing bays near Olympia, Wash. Numbers refer 
to depth in fathoms. Location of diked beds is shown by x’s. Dikes in which most obser- A Lsi’istol reCOrd- 
vations were made are indicated. Depth samples were taken in channels off Corters Point Jj, g. thermometer Was 
(C. P.), Maple Point (M. P.), and Deepwater Point (D. P.). . ° 
installed on a frame 
well above the high tide level but with the bulb fixed at the level of the oysters in the 
dike below. Protected though they are by a few inches of water at low tide, the 
oysters are nevertheless subjected to considerable variations in temperature as affected 
by both tides and seasons. The thermograph records were analyzed by averaging 
the readings on each hour of the day. This is necessarily not strictly accurate, but 
undoubtedly the error involved is within that inherent in the instrument itself. 
