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- Xref: sparky alt.fishing:3209 rec.outdoors.fishing:1536
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- From: tomg@PROBLEM_WITH_INEWS_GATEWAY_FILE (Thomas J. Gilg)
- Newsgroups: alt.fishing,rec.outdoors.fishing
- Subject: Re: Planted vs. natives
- Message-ID: <1992Dec28.223858.26469@hpcvusn.cv.hp.com>
- Date: 28 Dec 92 22:38:58 GMT
- Article-I.D.: hpcvusn.1992Dec28.223858.26469
- References: <1992Dec28.070226.9719@nevada.edu>
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- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
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-
- > If a trout is planted, and then spawns, is it's offsprings now
- > considered natives or are they considered planted? Thanks.
-
- Good question (I dunno). Seems like there are several major variables
- with many possible outcomes:
-
- Genetic Source for Stock | Method of subsequent reproduction
- -------------------------|--------------------------------------------
- | Hatchery Natural
- -------------------------| -------------------- --------------------
- recently introduced | hatchery hatchery ?
- |
- long ago introduction | hatchery wild
- |
- historic indigenous | native & hatchery ? native
-
- I think of "native" as the genetic strain that historically populated an
- area. For salmon and steelhead atleast, these are the fish that have
- spent 10,000 - 20,000 years fine tuning themselves to a particular watershed.
- Any tinkering by running them through hatcheries (i.e. humans control the
- spawn) or by cross-breading zaps their right to be called natives.
-
- I think of "wild" as any genetic strain that shows natural spawning success
- for a given watershed over time. Allowed to spawn naturally for hundreds
- of years, they might be called natives.
-
- I think of "hatchery" as any hatchery reared fish. Repeated hatchery-izing
- of any fish will alter the genetic components no matter what the genetic
- source was.
-
- At the recent Oregon Salmon Summit, some talked of identifying and protecting
- "core" fish populations. If we can't protect everything, maybe we should
- protect large genetic pools with the hope that if humans can straighten up
- and restore all the rivers and creeks in the future, that the core populations
- could be used to re-seed lost populations.
-
- Thomas Gilg
- tomg@cv.hp.com
-
- > -What can I say in only 4 lines?-
-
- Does your screen scroll sideways ?
-