i agree poppa, the reading i have done would suggest that anadramous fish easily swim with or against the current flow. it also suggests that different species of salmon actively travel at different times of the day and night with some salmon 'drifting' in the darkness. the key issue is whether or not they are feeding/attacking that is still quite a puzzle as fisheries studies still tend toward salmon with empty stomachs. thinking of open ocean fishes in terms of stream/river fishes just does not match what is happenning in the blue.