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Charlie Shugart wrote:
Great series- and great commentary as well, Ken.
Your underwater attempts were very successful imo.
I assume that the 2-year cycle of the species do not go to sea- and that's why they're smaller than their kin that DO go to sea.
I'm surprised that the fresh-water-only salmon die after spawning, though.
Hatched in fresh water, living in salt water, and spawning in fresh water makes it understandable that they die after spawning because of the difference in specific gravity of sea water compared to fresh- their cells literally explode in the fresh water.
But why would the landlocked members of the species die...Show more →
No sea for these guys Charlie. 100% certified land-locked. Something about their genetics just kicks in and a watery, internal version of self-immolation takes place. Not sure the seagoing populations have an issue with homeostasis/osmosis, as they live for many days in fresh water prior to spawning. From the Wikifoot: The condition of the salmon deteriorates the longer they remain in fresh water. Once the salmon have spawned, most of them deteriorate rapidly and die. This programmed senescence is "characterized by immunosuppression and organ deterioration." The Pacific salmon is the classic example of a semelparous animal.
Thanks for commenting!