Comments: Total adult population size is unknown but presumably exceeds 1,000,000. This fish is common and locally abundant in many areas. However, several unique populations have declined to very low levels of abundance including G. a. williamsoni (unarmored form from southern California) and 4 species pairs in British Columbia, one of which is now extinct (Hadley Lake, Lasqueti Island, B.C.; Hatfield 2001a, Wood 2003).
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