What does the text imply about the migration of Pacific salmon?

The text implies that the migration of Pacific salmon is a critical aspect of their life cycle due to several interconnected factors. This migration is essential for salmon reproduction, as they travel long distances from their spawning grounds in rivers to the ocean, and then back again to complete their life cycle. This journey is not only vital for their breeding and survival but also plays a significant role in the ecosystem, impacting other species and the overall health of aquatic environments. Understanding the importance of migration helps highlight the challenges salmon face, such as changes in their habitat, climate variations, and human activities. Therefore, it emphasizes the notion that migration is not merely a routine behavior, but a fundamental process that affects both the salmon population and the broader ecological context.