What effects do man-made objects have on salmon?
Many man-made objects hurt salmon by blocking their migration route or making it much more difficult. Dams on rivers of course are the main problem to salmon migration. Other man-made objects are designed to help salmon, like fish ladders. Fish ladders help the adult salmon migrate up a river and work very well. Dams are more of a problem for small salmon migrating downstream because they end up going through the turbines if they can’t find the passages placed in the dam to help them. Roads across and alongside streams can be a problem if dirt from the road clogs up the gravel in the stream. How many species of salmon are there? There are eight species of Pacific salmon: chinook, coho, chum, sockeye, pink, steelhead trout, masu and amago salmon (two Asian species). Are there specific seasons in which salmon can only be found? Yes, most salmon can be seen migrating during the fall (September through November). Steelhead trout migrate in the summer and winter but don’t spawn until spring
