* Trees provide shade, which helps to keep the water cool. This is important because salmon need cool water to survive.
* Trees help to filter pollutants and nutrients from the water, which helps to keep the water clean. This is important because salmon need clean water to spawn.
* Trees help to create a stable environment for salmon. This is important because salmon need a stable environment to survive.
* Trees provide cover for salmon from predators. This is important because salmon are prey for a number of animals, including bears, birds, and other fish.
In addition to these direct benefits, trees also help to support the ecosystem that salmon rely on. For example, trees provide food and shelter for the insects and other animals that salmon eat. Trees also help to hold soil in place, which prevents erosion and protects salmon habitat.
Overall, trees are essential to the survival of salmon. Without trees, salmon would not be able to survive in the wild.