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Migratory Behavior
Osmotic Migration
Movement between salt regimes for physiological reasons rather than diet or reproduction - crucial for euryhaline species.
Trigger: Environment Function: Following optimal salinity gradients
📖 Overview
Bull sharks, salmon smolts in transition, and juvenile snook actively seek specific salinity zones during physiological transitions. This is distinct from anadromy or catadromy - it is not about reproduction but about seeking the water chemistry the fish physiology requires at that moment.
✨ Fun Fact
Juvenile bull sharks may spend years in freshwater environments like the Amazon or Lake Nicaragua before returning to marine waters as adults.