Just any FYI that the currency for delivery of nutrients is kg of spawner per square metre of stream surface area (generally SLF). In studies of loading effects, the point of inflection between steep increase in positive benefits and a slower increase (the famous "hockey-stick") is about 2 kg per square metre. Do the math. One mile (1.6 km) of 10' (3m) creek would take a bit less than 10k kilograms. At a 2 kilo pink that is 5,000 2 kilo pinks in that mile.

1000 fish in a mile is a lot of fish but way down the list of what's needed. Other research has shown that a stream can accept and process up to 8 kg per square metre over the course of a year so the 2 kilo (or even 1-1.5) can be applied to each species of semelparous spawners.

And, there are places even in WA where these numbers have been approached and exceed. Small creeks, generally. but it has happened naturally.