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" SUMMARY OF OPERATIONS ON CONTRACT NO. W-28-094-eng-33
FOR THE MONTH OF JANUARY 1948,
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The basic program of the Applied Fisheries Laboratory
of measuring
the effect of X-rays upon aquatic organisms, was further expanded by the
inclusion of amphipod experiments.
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Sections I and II*
Egg lots from the Fall 1947 spawning of chinook salmon adults from
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irradiated and control stock have contimed developing. Mortalities have
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been recorded and the dead preserved for further study in all 15 lota,
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It is believed that [ot 13 of the controls and Lot 14 of the irradiated
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stock were not yet ready to be spawned and so should not be considered in
the comparison because their high mortalities mask the difference that is
evident when only the remaining 13 lots are considered,
The average per-
centage mortality through January 31, 1948 for the 7 control lots was 6.5
compared to a value of 23 for the 6 lots from 100 r irradiated stock, The
value of "t" was 2.26 which, for 11 degrees of freedom is slightly beyond
the 5 per cent level, and is considered significant.
As these animals develop studies will be made of the numbers malformed #
and degree and kinds of abnormality.
Some modifications from normal
structure are now evident but it will be possible to determine the extent
of variation from the normal with greater accuracy after the yolk sac perio ; has passed and the active feeding period starts,
II.
Basic X-ray studies were initiated during the month by exposing amphipods
to varying amounts of X-ray irradiations,
These studies were designed to
more fully understand the effect of irradiations on various members of the
animal kingdom.
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#Section numbers refer to the Project Chronology Chart, revised January 9, 1947."
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