More natural cultivation environments benefit salmon stocks

The more the cultivation environment for salmon resembles that of nature, the better equipped the fish are to make the transition from a cultivated to a wild environment.

Malin Rosengren, at the Department of Biological and Environmental Sciences, shows in her thesis how compensation cultivation, cultivation tanks in which fish are raised, can be improved by simple measures.

A problem for the salmon species that migrate between freshwater and saltwater is that spawning areas for the fish today are destroyed by hydroelectric dams. This has resulted in what is known as compensation cultivation, or tanks in which salmon are raised before being released into natural waterways.

But a cultivation environment, where thousands of fish swim in the same tank, differs significantly from natural waterways. There is a great risk that the fish will become stressed and poorly equipped to survive in the wild environment.