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A fish species which as juveniles spend 1-3 years in rivers as they feed and grow undergoing a process known as "smoltification" and then begin to migrate to the ocean.
They spawn and rear juveniles in river after they spend 2-3 years in freshwater, then migrate to oceans to spend 2-3 years there until, finally, they return to their natal river to spawn.

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The salmo salar move with the current via the lateral line at which acts like a sixth sense to detect the flow of current.
The salmo salar has four sets of gills to allow them to migrate between fresh and salt water.salt is taken from the water and expelled via a gland this is called osmorgulation
It is said that their sense of smell is 1,000 times greater than a dogs therefore helping them navigate through the water

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After hatching, turtles travel towards the sea, using the light reflection off the water to guide them. On cloudy or moonless nights in the complete absence of natural light the distant horizon over the ocean is still slightly brighter than the land mass in the other direction. This is due to very residual amounts of light either preceding the rising sun or the last bit of light following the setting sun around the earth's curvature. That's part of why artificial light pollution can mess up hatchlings so much.

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Turtles are one of many species that use their sense of Earth's magnetic field to navigate great distances. But the magnetic field is constantly drifting, and that can cause major confusion in such a long-lived species. Here's their ingenious solution.

Species like the loggerhead turtle show incredibly fine-tuned understanding of the Earth's magnetic field. Born on the coast of Florida, the hatchlings will swim out to the open ocean and spend six to twelve years in a vast circular current called the North Atlantic Subtropical Gyre. During this time, they rely on their knowledge of magnetic north to remain inside the gyre. They, they head back to the Florida coast to breed, using their sense of magnetic north to navigate to the correct location.

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They have an organ called the johnstons organ at the base of their antennae! This helps then maintain balance and orientation expecially during flight

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Have a built in magnetic map. Able to sense changes in the earth so magnetic field which allows them to establish a position In the ocean.
It is also believed they have an adapted sockeye which memorises the magnetic field they travel on.

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Their antennae are studded with sense reseptors that are used to smell. They use them to smell food and to find mates

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They have antennae

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Migrate from north America to Mexico. Use position of the sun and biological clocks in the antennae to determine which way South is

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a sea turtle is sensitive to touch on the soft parts of its flippers and on its shell. They also use their sense of earths magnetic field to navigate great distances. But due to it constantly drifting it can cause major confusion.

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Within the forth generation (adult butterfly) it will migrate to warmer climates within the autumn and winter months. This includes places like Mexico and California. Approximately 2,500 Miles is travelled when making the migration journey. They do this by using the sun to guide them, it is been researched that butterflies must use some sort of 24 hour clock within their brain to guide their migration, it’s researched that this could also be located within the antenna as when they were removed in research they didn’t have the ability to navigate using the sun or adjust their direction based on the time of day. From this migration the butterfly will live for six to eight months, then the generation process starts again.

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Monarch butterflies to navigate by using te sun as a compass, meaning they use the position of the sun to determine which way is south. In the fall, millions of monarchs from all along the northeastern corridor of the U.S. to Canada migrate to the Michoacán mountain range in central Mexico, crowding together so densely that the air is filled with butterflies.