ICHTHYOLOGY and LAKE ECOLOGY
OLIGOTROPHIC, MESOTROPHIC, EUTROPHIC
TROUTNEED COLD, CLEAN WATER
BULLHEADSCAN TOLORATE WARM, MUDDY WATER
HARD WATER VS. SOFT WATERMineral in bedrock (Leeching)
Boundary Waters Canoe AreaGlacial Erosion, Acid Precipitation?