Trout and Salmon Movements in Two Idaho Streams as Related to Temperature, Food, Stream Flow, Cover, and Population Density

摘要: Abstract Many juvenile salmon and trout migrated from the Lemhi River drainage each fall-winter-spring period. Seaward migration of anadromous normally occurred in spring but pre-smolt non-anadromous fishes also left stream usually beginning fall. I compared data on temperature, food abundance, flow, cover population density with movements conducted field laboratory tests to determine reasons for two types movements. Smolts species an obvious reason none factors examined appeared “stimulate or release” their seaward migration. Movement frequently coincided changes water temperature could not establish a consistent causal relationship concluded that photoperiod perhaps growth must initiate physiological behavioral associated Non-anadromous emigrated streams differen...