Their advice was to be sure these experimental designs are used for collecting basic scientific data, not targeted to more politically worded questions.
Research seems to be lacking and the question links to many other questions.
Relate solutions to site specific needs of farm and fish. Identify mechanisms by which sediment from hort operations reaches waterways for perched streams and ditches. Identify and compare the filtration effectiveness of different management regimes of buffer areas next to crop operations. Compare difference between leave strip, mowed strip, native, managed, in protecting salmon. Compare impacts of urban, forested, and agricultural areas on salmonid habitat.