( Gasterostous aculeatus) was common. Two species of sculpin, 

 Cottus asper and Leptocottu^ armatus were taken in the vicinity 

 cTTntioch. Juvenile starry flounder ( Platicht hys s tellatus ) 

 were also taken in the nets. Station 26 in the lower Sacramento 

 River yielded a considerable number of anchovy ( Engraulis mordax 

 nanus ), bay smelt ( Atherinops af finis af finis ), and herring ( Clupea 

 pallasii ). Two kinds of gobies were taken, one species, Clevelandia 

 ios, was captured frequently at stations 15, 16, and 26; only a single 

 specimen of the other, Lepidogobius lepidus , was taken in the fyke net 

 off Toland's Landing, 



In order to demonstrate to what degree the king salmon, striped 

 bass, and shad will be endangered, it is essential that each species 

 be discussed separately. The ensuing discussions, tables, and graphs 

 summarize the data collected and provide evidence relative to the 

 jeopardy into which these fish will be placed by the operation of the 

 Tracy Pumping Plant and the transfer of Sacramento Paver water to the 

 San Joaquin Valley via the Delta Cross-Channel, 



The charts are designed to facilitate a clear understanding of the 

 seasonal occurrence, distribution, and abundance of juvenile king sal- 

 mon, striped bass, and shad in the Sacramento-San Joaquin Delta, By 

 the use of these charts the reader is enabled to recognize the initial 

 occurrence, with subsequent movements and fluctuations in abundance as 

 the season progresses, and he can associate this information with cer- 

 tain measured physical factors represented by bar diagrams on each 

 cycle. All data on which these charts are based are presented in 

 tabular form in the appendix. 



The amount of information collected on the life history of the 

 smelt ( Hypomesus olidus ) warrants inclusion in this report. The data 

 collected for each station during the two seasons (19h&-19h9) are given 

 in Appendix Tables 17, 18, and 19, but the data are not discussed. 



King Salmon ( Oncorhynchus tschawytscha ) 



Spawning migration 



The distribution of king salmon within the Sacramento-San Joaquin 

 Delta reflects movement of adults to their upstream spawning grounds 

 and young salmon migrating to the ocean. 



Adult king salmon returning to spawn in the streams of the Central 

 Valley pass through the Delta in every month of the yearj however, the 

 majority of them move during two distinct migration periods. These 

 periods occur in the spring and fall of the year and are spread over 

 several months. The spring migration appears in February, reaches peak 

 proportions in May and diminishes in June. The fall run of salmon 

 usually makes its appearance in August, increases to its peak of abun- 

 dance in September and declines by the end of October. 



•c 



