site indicated a more varied diet, which included gammarid amphipods, 

 barnacle nauplii, euphausids, harpacticoid copepods, and eggs of 

 invertebrate animals. 



Epibenthic forms, and not zooplankton, were found to be the most 

 important food types. (Whether the epibenthic forms are the 

 preferred food type is not known since tests were not made on food 

 selectivity.) Accordingly, the ecological zone that the epibenthic 

 organisms inhabit is of primary concern when alteration of the shore- 

 line areas and beaches is being considered. Piers, jetties, land 

 fills, marinas, bulkheads, and other facilities that disturb or 

 destroy beach area could be highly detrimental to aquatic life, 

 especially the kind that lives in association with the bottom sub- 

 strata. Not only do these salt-water installations remove living 

 area for commercially important fishes, but they also eliminate 

 habitat that supports the food these fishes feed upon. (A. A., expanded) 



Keywords: salmon, food habits, environmental changes, Washington, 

 Puget Sound 



IV-E-30 



Chadwick, H.K. 1971. Striped bass and water development in the Sacramento- 

 San Joaquin estuary. Pages 58-68 i_n P. A. Douglas and R.H. Stroud, eds., 

 A symposium on the biological significance of estuaries. Sport Fishing 

 Institute, Washington, D.C. 



Anadromous fisheries resources in California are affected directly by 

 ecological changes in rivers and estuaries as a result of water development. 

 Striped bass are strictly sport fish in California, and they support the 

 most valuable fishery in the Sacramento-San Joaquin estuary. 



This paper illustrates how water development affects fisheries resources 

 in the estuary by describing the effect of water development on ecological 

 requirements of striped bass. Programs to alleviate potential adverse 

 effects are also discussed. The discussion is limited to effects associated 

 with water storage and distribution. The effects of pollution, dredging, 

 and filling, although important, are not included in the discussion. 



Loss of eggs and larvae, reduction in zooplankton and benthos populations 

 in delta channels, loss of migrating adults, reduction of spawning area 

 and lower survival rates of young bass, are anticipated effects of water 

 development. (B.W.) 



Keywords: fisheries, sport fisheries, zooplankton, estuarine management, 

 California 



194 



