Humboldt Bay, California. 



LOCALITY I TIME. | TIDE. | SALINITY. | TEMP. ^F. 



Samoa 1 10:30a.m. 1 



Beacon 8 10:45a.m. | 



Eureka '2:30 p. m.j 



Beacon 8 3:15 P- Qi- 



Flood. 

 Flood. 

 High. 



High. 



1.024 S & Bl 61 S & B 

 1.024 S & B! 63S & B 



Frshwtr Slough j 

 nr. Havne's..i 



1 .024 S 

 1.024 S 

 1.024 1-5 B 



1.023 1-5 S 



60 



57 

 55 



63 



OBS'R. 



F. Iv. W. 



The optimum spawning temperature on the Atlantic coast is 

 between 70*^ and 80^ F. and the salinity may be as low as 1.012. 

 In the most northern locality, however, where the eastern oyster 

 is found, the spawn developes in much colder water. 



Places can be found in Yaquina Bay where a summer density 

 of 1.012 with some variations can be secured. But such places 

 are so far up the bay that the winter freshets might possibly en- 

 danger the lives of the oysters planted there. 



As stated above Yaquina Bay appears to offer the greatest in- 

 ducements. Coos Bay is somewhat cold and salt except near 

 Marshfield at which place the oyster might suffer from winter 

 freshets and sewage. At Glasgow, some miles below Marshfield a 

 most excellent bottom for oysters was discovered, and if a cold 

 water variety, from tlie neighborhood of New Brunswick for in- 

 stance, could be planted there, they miglit possibly prosper. Till- 

 amook Bay is too cold and too salt except so far toward the 

 head of the bay that oysters would be killed by mud and fresh 

 water in the winter if placed there. 



Humboldt Bay, Cal., visited by direction of the Fish Com- 

 missioner, was found to be unfavorable and the plant at that 

 place was in poor condition. 



It is claimed on the best authority that Eastern oysters in 

 San Francisco Bay have spawned and the spawn lias developed, 

 lor some years. The two large companies controlling the East- 

 ern oyster industry there deny this, although photographs to 

 prove the assertion were secured some years ago by C. H. Town- 

 send of the U, S. Fish Commission. 



Biological Laboratory, April 21, 1898. 



