Does the Use of In-stream Structures and Woody Debris Increase the Abundance of Trout and Salmon? (systematic review)

What is the aim of the review?
To systematically collate and synthesise published and unpublished evidence in order to examine the impact of in-stream structures on the abundance of salmonids and Cottus gobio. The secondary objective was to examine the impact of hydrological and ecological variables on the effectiveness of in-stream structures.