2
- an
consideration, the 7 lots of irradiated stock show a significantly
(3 per cent level of "t") higher mortality (26%) throvgh December 30, 1947
than do the 7 control lots (5.5%).
If Lot 13 be included, the difference
is not significant, "t't being above the 504 level.
Egg weight and uniformity of egg size do not differ significantly
when comparing irradiated with control stock.
Sections VI and VII.
The work completed in these two sections was summarized into a final
report, UWFL-8, "The effects of Roentgen rays on the embryos and larvae of
the chinook salmon",
This report was forwarded to the Atomic Energy Commission
for clearance for anticipated publication.
Section XI-B.
During January 1945 a total of 128 rainbow trout yearlings were
exposed to 50, 100, 500, 750, 1,000, 1,500 or 2,500 r of X-ray.
fish were used as controls.
Twenty
These fish spawned in the spring of 1945, and
their progeny were studied during 1945, 1946 and until the spring of 1947
when they in turn spawned.
On December 26, 1947 the rainbow fingerling of the year, Fo generation,
were measured and weighed individually.
When the average lengths were tested
using "t", there was shown to be no significant difference between the
controls, the 50 r, and the 100 r stock,
Differences from the controls of ©
the 500 r and 750 r groups were significant, and of the 1000 r group was
highly significant,
Mortalities of these rainbow fingerling during the past quarter totaled
9 fish distributed as follows.
Four of the 1000 r group died, 1 - 100 r,
3 - 50 r, and 1 control.
II.
Sultures of marine organisms were started and equipment assembled to
initiate a program of food-chain assimilation and transfer studies,
DOS ARCHIVES