General interest questions

Greg Broadhead gregb at
Fri Feb 18 11:03:07 EST 1994

In article <ART.94Feb17150745 at>,
Al Thompson <art at> wrote:
>In article <1994Feb17.023022.13337 at yuma> arsmith at lamar.ColoState.EDU (Alan Smith) writes:
>   In article <2ju5gv$g76 at> hcorbett at () writes:
>   >Why do salmon die after reproduction (also worded as, why can't they 
>   >undergo gametogenesis more than one time in their lives)?
>   They never got selected for more than one?  Maybe going up a western American
>   river and breeding takes too much energy for them to be able to go back
>   downstream.  Remember their food scource is in the ocean.
>But, the steelhead and sea run cutthroat trout both go up stream and back
>to the ocean many times.
>   I seem to remember hearing that atlantic salmon actually do make repeat
>   trips.
>Atlantic salmon are trout, not true salmon.

	It might have something to do with the length of time it takes to
get to their spawning area, remember that these fishes are undergoing
osmoregulation, which places a great stress on the metabolism of these
fish.  Plust they are swimming upstream, often up waterfalls.  Salmon may
not be as equiped to osmoregulate as a cutthroat trout.


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