Salmons in Canons! What Are We Doing?

I just read an article here that disturbs me http://news.sky.com/story/1317804/salmon-cannon-fires-fish-over-dams-at-22mph

It sounds good that they are helping the Salmon get into the lakes that they spawn in.  They are using a type of soft sided cannon to fire these fish into the lakes and dammed areas that they spawn in to help them with the yearly track to reproduce.

I have some concerns with this.  It is just putting a band aid on a man-made problem with another man-made solution.  Every single time that we fool with the workings of Mother Nature we produce problems for ourselves later down the road. 

The problems that I see are:

1.      How are the salmon going to get back down stream and into the oceans until the next migration to spawn again?

2.      I see this as a problem with the fish and wildlife that are already in the upper part of the dam with the addition of these that could not make it.

a.      It will definitely cause some species to decrease in the waters as these salmon will take over the big pond.

b.      It will definitely cause an abundance of other species, such as bear to be on the increase in population as salmon is their favorite food source.

3.      When there ae more problems with more bears, will humans kill them in the long run, make them close to extinction too?

We grow salmon in fish farms and there are others that grow certain species of fish in enclosed habitats in the lakes and oceans in other parts of the word.

When we fool with Mother Nature she always finds a solution to those problems that we have made.