This might be a strange question, but why do sea turtles lay eggs on land and not for example dig up holes inside the ocean? They live their whole lives in the ocean, so why do they lay eggs on land? Why travel so far just to lay eggs?
Same goes for some salmon, why do they leave the oceans and lakes, and go upstream on rivers and not lay their eggs where they live?
It is probably something to do with protecting their offspring, but it seems to me that they still have predators that hunt their offspring fairly easily where they hatch/lay their eggs, so maybe there is another reason as well?
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Salmon are anadromous fish, they live in the sea and migrate into fresh water to spawn; Catadromous fish like Seabass or Eels do the opposite – as adult fish they live in fresh water and migrate into salt water to spawn. Now you know.
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