My local stream keepers has been monitoring PH, bugs ect for a very long time. Salmon populations have been relatively stable in the creek for the past 50 years, Chum, Coho and cutthroat trout. Chinook smolts also use it as habitat but it does not have a Chinook population, The smolts are from other systems. Altho it has tea colored water and i believe you mention that this water is more productive???