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SUMMARY OF OPERATIONS ON CONTRACT NO... W289i “Woe
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FOR THE MONTH OF MAY 1948,
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Project I.# Basic studies on the effect of X-rays upon fish in various stages
of development.
Sections I and IIx
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BEST COPY AVAILABLE
The chinock salmon fingerlings (F, generation) from the 1947
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spawning of adults from irradiated (100 r) and control stock were
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warked during the month and their release to migrate to sea started.
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The fingerling fish (F, generation) from 100 r stock were marked
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by the removal of the adipose and left ventral fins while the fingerling
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(Fo generation) from the control stock are being marked by the removal
of the adipose and right ventral fins.
Following the fin removal, for identification, the young fish are be-
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ing held to give time for recovery from the marking and handling, before
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transporting them to the Samish River. From the Samish River the fish
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should migrate dow to their normal feeding grounds in the sea,
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fish that survive we would expect to return in the fall of 1949-1950 or
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1951.
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to determine the genetic changes that may occur.
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The progeny of this group (F, generation) will be carefully studied
The work up to date on the fish in these sections will be summarized
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and the data presented as a basic report.
Sections XI a - XI b
The young fish in these sections represent the survivors of the
second generation (Fo) offspring of adult rainbow trout exposed to X-rays
and spawned in 1945,
* Project and section numbers refer to the Project Chronology Chart and
Summary, UWFL-9, revised March 11, 1948.
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