How do fishes navigate in the ocean? Because the sea floor is also very deep in the oceans it becomes even harder for them to create a map of the ocean inside their head. For migrating from one ocean to another they definitely need some map in their head. Also not all fish have sonar plus it has limited range and it even makes the job harder as the entire body of water surrounding a fish is constantly evolving
How do they create this map of the ocean inside their head ?
In: Biology
How much of a map *do* they need? Many migratory fish really only need to go north or south depending on the season, and following a coastline is easy. Wikipedia is also telling me that it’s common to follow currents that change with the seasons, which also often flow around coastlines. Some fish have organs that can detect the earth’s magnetic field, which can not just orient them north-south but be used to go in any direction – not that they’re consciously navigating like we’d use a compass, but evolution can give you a fish that knows to swim southeast when the water gets colder, just as much as one that swims pure south.
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