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1. Atlantic salmon go to sea to grow. The energy content and abundance of food in the ocean is much higher than in freshwater, so fish are able to grow very big, very quickly. This is important because larger fish are less likely to be eaten and the females have more eggs.
3. Salmon come back to the stream where they were 'born' because they 'know' it is a good place to spawn; they won't waste time looking for a stream with good habitat and other salmon. Scientists believe that salmon navigate by using the earth's magnetic field like a compass.
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