A method was developed for classifying genetic variation among rainbow trout stocks in BC based on a hierarchical classification of habitat variation. The levels in the hierarchy starting from the top are life history type (anadromous vs. feshwater, fluvial vs. adfluvial vs. lacustrine), length and difficulty of migration route, biogeoclimatic zone, fish species complex and a variety of other habitat variables (lake or stream size, water chemistry, stream gradient). The validity of the classification scheme needs to be checked using patterns of variability in adaptive traits among stocks.
Parkinson, Eric, Rosenfeld, Jordan. 1996. Quantifying Stock Diversity of Rainbow Trout. Ministry of Environment, Lands and Parks. Fisheries Project Report. FPR53