176 



determine the most important indicators to study to evaluate the 

 impacts of drawdown. 



ob-i«ctivc 1. Conduct a review of literature on nearshore fish 

 communities and the effects of water level 

 fluctuation in reservoirs on fish populations. 



Ob'i»ctive 2. Review existing prey abundance data from 1983-86. 

 T*«l: 2.1 Determine locations of previous sampling sites 



and outline data collection methods. 

 Task 2.2 Review and summarize fish community information in 

 "the existing data set, focusing on major community 

 attributes such as percent composition, species 

 diversity, temporal variation in composition and 

 catch, catch-per-unit-effort data, and size 

 composition information. 



Rationale: Determining major community attributes 

 from the existing database is important since 

 predrawdown data collection will be limited to one 

 year. As part of the predrawdown proposal we will 

 examine the feasibility and reliability of using 

 previously collected data. Using the existing 

 information is important because we do not know the 

 magnitude of interannual or longterm fluctuations in 

 major community attributes of resident fishes in the 

 John Day Pool. Assessing gross changes between 1995 



I 



