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Needs
Flesh out the stick figure model I have presented with data on smolt out migration rates and natural nutrient fluxes.
The impact of releasing masses of hatchery reared smolts needs to be included in any attempt to fully quantify the nutrient cycle. Do they die before exiting the stream and add nutrients or do they feed during the journey and mine the stream of nutrients?.
The ecology associated with spawning salmon needs to be understood in greater detail.
Notes:
If hatchery releases feed on the way downstream and suffer insignificant mortality, they will extract nutrients from the watershed. If there is significant mortality of the hatchery fish before they leave the watershed, they could be a significant source of nutrients in the watershed.