Predator Control

Strategy: Reduce Effect of Prey
Issues: Fish Migration and Fish Populations

As smolts exit the turbine area or bypass system they are particularly vulnerable to predators, particularly squawfish. These predatory fish essentially “camp out” below the dam. One means of reducing the abundance of squawfish below a project is to provide fishermen bounties to catch them. Another is to select a release point where predators find it more difficult to thrive.

Seagulls and arctic terns also prey on smolts. One method of reducing their effect is to place piano string across the river, causing a hazing that makes seeing and therefore preying on smolts more difficult.