A trout finds food near the top of a river. It wants to find a safe place deeper under water to eat the meal. How does the swim bladder help the trout get to deeper waters?
The swim bladder is a buoyancy organ in fish that helps them regulate their depth in the water. By inflating or deflating the swim bladder with gas, the fish can control its buoyancy and stay at a desired depth in the water. When the trout wants to move to deeper waters to eat its meal, it can adjust the gas in its swim bladder to become less buoyant and sink down to the desired depth. This allows the trout to safely access its food without having to struggle against the current near the surface of the river.
