• mick@lemmy.world
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    10 months ago

    Hmm. Aren’t the Great Lakes in North America connected to each other and then to the St. Lawrence River via Lake Ontario, which eventually leads to the Atlantic Ocean? Maybe the map should include those large bodies of water too.

    • teft@lemmy.world
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      10 months ago

      There are fish that go from saltwater to freshwater or vice versa. They’re called anadromous fish. Salmon are one species like that. So you’ll have to include every river as well.

    • Dem Bosain@midwest.social
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      10 months ago

      Lampreys are the greatest explorers among saltwater fish. They’ve mapped most of deepest darkest Greatlakesica, but most don’t make it back out to report their findings.

      • mick@lemmy.world
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        10 months ago

        How do biologists determine that the lampreys migrated from the ocean versus being hatched/born in the Great Lakes?