VOICED : Salmon hitch a ride to the ocean because of California drought

The video discusses the challenges faced by wild Pacific salmon due to drought conditions. Salmon are unable to swim to the ocean naturally, so they are transported 200 miles to San Francisco Bay to ensure their survival. This costly alternative aims to preserve the fishing industry. The salmon are acclimated to new waters before being released, and they must return in three years to lay eggs.

Why is the alternative route for transporting the fish considered not normal operating procedures?

What is the significance of the journey the salmon must make in three years?