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Task 3.1 E>etermine sanpl* sizes- needed to detect largescale 

 changes in catch and cooposition for major species 

 at each sampl* location in previous prey abundance 

 studies (Palmer et al. 1986). 



Rational*: The ability to detect largescale 



differences in catch and community composition for 



major species in the prey abundance study is 



important since predrawdown data collection is 



limited to 1995. If major differences in catch and 



» 



composition do not exist between the previous 

 database and 1995 collections we may be able to use 

 the prey abundance study as additional baseline 

 information. 



Methods: We will conduct a statistical power 

 analysis on the existing data set to determine 

 sample sizes needed to detect changes in the 

 relative abundances of important nearshore species. 



Products: Sample sizes needed at locations within 

 the major strata of the John Day Pool study area. 



Schedule: Prior to sampling in spring 1995. 



Task 3.2 Conduct beach seining in selected habitats of the 



