Each salmon run is on a three year cycle.
At least Dan listens to what the elders have to say about the history of salmon runs.
By the turn of this century, only a few rivers in Maine had significant salmon runs.
The town went into decline as the salmon runs were depleted.
The native salmon run has unfortunately been much reduced due to many different factors.
The effects on local salmon runs are increasing as well.
The pink salmon run occurs in even numbered years only.
State records show that the salmon runs were reduced by 75 percent after the dams went up.
This year's healthy salmon runs are due partly to high water in earlier years.
There are concerns that this too may endanger future salmon runs.
Wörterbuch für Biologie