Sorry, my thinking was more directed to the eastern Fraser Valley (Chilliwack - Agassiz), where the Salish Sucker has recently made news. I do not believe your numbers are correct for this area, but would be happy to find out where they came from.
My numbers are from a Ministry of Agriculture and Lands brief on agriculture in the Fraser Valley Regional District (this is the eastern Fraser Valley including the municipalities of Abbotsford, Chilliwack, Hope, Kent and Mission, as well as the electoral districts of Hatzic Prairie, Nicomen Island, Hemlock Valley, Sumas Mountain, Columbia Valley, Popkum, Yale, and Boston Bar). The brief was put out in 2001 (so the numbers are 10 years old), but I do not think the numbers have changed dramatically in
nature of the farming done in the area, only in the
number of farms (there is a growing trend towards larger "factory" farms in the Fraser Valley as elsewhere). The brief does show that while the number of farms had shrunk by 10% (the area farmed also declined by 10%) in the 10 years previous (from 1991-2001), the number of livestock had not shrunk as much, and in some cases (poultry and pigs) had actually increased. The number of dairy farms specifically had declined by 19% in those ten years while the area of pasture lands (both managed and unmanaged) declined by 40%, however, the number of milk cows dropped only 2%. This shows that farmers in the Fraser Valley are consolidating into larger operations, and most are really pushing the limits on their land (the fact that average farm size in the Fraser Valley remained steady at 18.3 hectares in that time, shows that the farms are not getting any larger in area, only more crowded). This is why many farmers (especially livestock farmers) are so concerned about the idea of ANY setback as they are already on the margins with little wriggle room. Does this mean we need to give up on a species at risk? Or does it mean we need to understand the farmers concerns and find a solution that saves a threatened species without unfairly penalizing the farmer.