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Task 9 Integration of field and laboratory studies on aspects of early life biology and development of selected fishes in the Green River system. Description of work: This study is proposed as a Hypothesis Testing study under the direction of the LFL. Portions of this study are a requested new start (RIP new emphasis: Management of Non-native Fishes). The overall goal of this study is to gain an understanding of the biology and behavior of early life history stages of fishes in the Green River, Utah, and how they are affected by Flaming Gorge operations through an integration of field and laboratory studies. Specific objectives include: 1) Determining the relationship of otolith and fish growth and the utility of otolith techniques to determine age-growth parameters of age-0 Colorado squawfish. 2) Investigating the effects of variable environmental factors (streamflow, water temperature, and food supply) on growth and survival of Colorado squawfish under laboratory and field conditions. 3) Evaluate the response of early life stages of selected fishes to manipulated environmental conditions and the role of sensory and locomotor systems in various early behaviors (e.g., feeding, predator avoidance, and swimming performance). - Hypotheses to be Tested: 3,7,8,9,11,12 Studies such as task 8 and 9 are considered important for the management tools that may result. Through integration of field and laboratory investigations it may be possible to isolate aspects of the early life history of some species which are flow related and can be used for selective management of the target species. Deliverables: Annual reports will be submitted at the end of the fiscal year. 1992 Budget': -Labor $54,000 -Travel $ 4,000 -Equipment $ 6,500 -Total $64,500 'Does not include FWS overhead B8