I can’t tell if I’m in r/no stupid questions territory here but I was just thinking about how their are fish, shellfish, etc. found all over the world. It’s easy for me to see how land dwelling species moved all over the world but how did aquatic life do it?
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They swim.
Ok being less cheeky, fish and etc often get introduced to new ponds and lakes and other bodies of water because their eggs or spawn of themselves are picked up by weather, critters, flooding or other method of transport and end up there. In this manner, even cut off water bodies end up filled with aquatic lifeforms.
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