Re: Salmon give birth to trout

From: Daryl Habel (Dar_83001_at_yahoo.com)
Date: 08/09/04 

Date: 9 Aug 2004 14:57:11 -0700

"firstjois" <firstjoisyike@hotmail.com> wrote in message news:<m9adnWH2dNvKXIrcRVn-gg@comcast.com>...
> http://www.nature.com/news/2004/040802/full/040802-10.html
>
> Salmon give birth to trout
> Michael Hopkin
> Surrogate sperm technique allows cross-species fatherhood.
>
>
> Japanese researchers have pioneered a breeding technique that allows salmon
> to father baby trout. The method could potentially revolutionize
> fish-farming and even resurrect extinct species, they claim.
>
> The researchers managed to create male salmon that produce sperm of a
> closely related trout species. When used to fertilize trout eggs, the sperm
> produced perfectly healthy young trout, report Goro Yoshizaki and his
> colleagues at the University of Marine Sciences and Technology in Tokyo.
> ---------------------------------------------------------
> Well, this was a little annoying. (And probably off topic?) If changes in
> our environment or maternal environment can trigger changes in our in utero
> development in an evo-devo sort of way then how can salmon give birth to
> perfectly normal trout?
>
> Please explain!
>
> Jois

I can't explain the Japanese technology, since I haven't read the
paper. But any trout fisherman knows that salmon/trout hybrids often
occur and are locally abundant in some streams (for example an
Atlantic salmon/brown trout hybrid in northern European streams).
Trout and salmon are very closely related species and some belong to
the same genus (others have a different generic name, but they are
still closely related), and hybrids of various trout species are well
known where I fish (Yellowstone ecosystem). Mostly the hybridization
occurs between species that spawn at the same time (spring or,
alternately, fall). For a better understanding of the trout/salmon
relationship see:

http://sites.state.pa.us/PA_Exec/Fish_Boat/pafish/fishhtms/chap16.htm

which might help,
Dar

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