As indicated in UWFL-34
(2)
future work will include, in
addition to snail egg studies, a comparison of the relative
biological effectiveness of soft and hard X-rays and Co°9
gamma rays using agar plates of Chlorella.
B.
Radiobiological studies of fishes
Results of the experiment on the effects of X-radiation
on early stages of development of salmonoids have been reported
in UWFL-34.
The report on the preliminary experiment on the
effects of X-rays on six developmental stages of rainbow trout,
Salmo gairdnerii, involving a total of approximately one
thousand fish, is being written.
Mortality, growth, body pro-
portions, fin ray number and color (parr marks) have been
studied and found to be altered by comparatively low doses.
Teratological effects on external features are now being ana-
lyzed.
This material will then be summarized and compared with
radiation effects on other animals.
The second salmonoid experiment in progress on Oncorhynchus kisutch (silver salmon)
is a much more complex study
on effects of X-rays on 17 developmental stages involving a
total of approximately 11,500 fish.
This study will include
analyzing the skeletal system (by radiographs) developed
subsequent to X-radiation as well as making observations similar
to those made in the trout.