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FOR THE WONTH OF APRIL 1948,
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SUMMARY OF OPERATIONS OW CONTRACT NO. W-28-094~eng-33
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Project I.#
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Basic studies of the effect of ierays upon fish in
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stages of development.
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Section I and IT*
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The young chinock salmon ==
from the 1947 spawning of adults from irradiated (100 r) and contrel
atock continue to develop.
Mortality recerds were kept on the loss
experienced by the offspring of each female.
Total cumulative
mortalities as well as the periodic mortalities at various stages
of development are being tested for statistical sienificance.
These data together with a summary of the work
in these sections
will be reported on in an early report,
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The young fish in these sections are the second generation (Fa)
offspring of the adult rainbow trout exposed to X-rays and spamed
in 1945.
As a part of the study program on thease fish the entire
lot were individually weighed and measured to provide data for con~
tinuing the study of growth in length and weight.
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Some of the male fish in this group are sexually mature but no
attempts were made to use their spawn for fertilization experiments
because of a lack of females of the same age class with mature eggs.
Project V.
Laboratory experiments using Bikini "mud" and coral rocks as
sources of fission products are summarized,
* Project and section numbers refer to the Project Chronology Chart and
Summary, UAFL-9, revised March 11, 1948.
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