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There could be an environmental feature they prefer in that spot. Edit: the article mentions lower concentration of harmful algae and a cooler temperature.
by kranner 2y ago
There could be an environmental feature they prefer in that spot.
Edit: the article mentions lower concentration of harmful algae and a cooler temperature.
- joseda-hg 2y agoBut then how are they aware of those conditions Also, the preference usually is more on the side of where they're born vs optimal proper placement
- chmod775 2y agoNice water flows downstream, terminates in the ocean. They simply follow it back upstream.
- jagged-chisel 2y agoI’m with you on this. Found some tasty water? Swim towards it. It gets tastier the further we go? Keep going.
- monknomo 2y agoYeah, no need to make this complicated.
- rightbyte 2y agoSo how do they find the river outlet into the ocean? There surely is some bird compass thing involved. I am only half joking when I write that Venus guides them. That nature works at all is astonishing.
- bad_haircut72 2y agoWord gets around? Animals probably have way better communication than we think. One crab says to a friendly eel "hey dont tell those damn Salmon but this estuary is good again" and before you know it, everyone's favourite restaurant is booked out till March.
- cruffle_duffle 2y agoI used to go to this estuary until it became too crowded.
- jaggederest 2y agoIt's all chemoception, the same as with single cell organisms. They swim towards a saline gradient ( which they can taste, for sure ) and follow it up into fresher and fresher water.
- Angostura 2y agoThanks, I was bang my head on this one, until you suggested a nice simple solution