What does this mean fish migrate to spawn?

Fish migrate to spawn means that fish travel long distances to reach suitable breeding grounds where they can lay their eggs and reproduce. This migration behaviour is triggered by various factors such as water temperature, day length, and food availability. Different fish species have specific migration patterns and routes, which are often determined by their genetic traits and environmental cues. By migrating to suitable spawning grounds, fish ensure that their offspring have the best chances of survival and growth.