assisted migration of fish... does it occur in your area?

There have been several programs for wild salmon migrating into UK rivers where hydro-electric projects and dams have made the route back to the fishes original breeding grounds impossible (as far as we know Salmon will always try and return to the river in which they were spawned). These projects involve building salmon runs along the waterway to ensure that they can swim past the man made obstruction. I do not know of any projects where salmon are moved past obstructions, but I am aware that young fish are sometimes reintroduced into the headwaters of rivers which have become less polluted in the hope that they will survive and return again to breed. Salmon are one of the truely long distance migrants in the fish world, but I am not sure of many other species which follow this behaviour, except eels. Atlantic Eels all return to rivers from the Sargasso Sea, but can live out of water for short distances and actually migrate overland to get from lakes into rivers for thier return journey.