2
Seotion Ii-b
Cea
The ootual experinental work in this section has
occupied almost ths antire attention of the steff durins the
monthe
Tho adult fish, the proceny of irradited or “control”
parents, continucd to spawn.
been obt:ingl ani the
A totel oF 298 esr lots hve
eaca sturted to develope
the ecss
when removed from the fearless and fortiliazed with the spawn
Of insoles of like irradiation axpearience have been retainod in
iadividucl somportuentsa durian the incubetion period and the
absorption of the yolk sace
imming this poriod the ounmbers
of egas and fry te dio during each ataze of dovelopmant
was recorded.
The numbers and kind of malformtions were
also deternined.
The great nusbers of youn; fish produced in the project
made it necessary to reduces tle nwsbers retained, ance they
reached the fooding stase.
7orticns of aach lot were retained
to wake a total sauple of 4000, for the control lots, 2000 for
each of the 50 r, 100 r, 500 r, and 750 r lots and 654 for
the 1000 r lote.
Only a totel of 654 fry survived from the
ese3 oF the udult fiah fron purents exnosed to 1000 r pricr
te spowning in tho aprins of 1945.
The samples being
dtained o¢ the vouns “lsh ure bein: studied for the effacts
of irradi. tion or ihe 3rd zsner:tion during the feeding atazgea.
nections SY-sVIT
Two adult Ash, one salo aml one fomule, returned t this
Laavesrorth itutdioun, during the uonth after two year absence,
durin’ which they sicrated to sea, fed for a time and returned
uz tuic Columbia River, enterci tha
‘enatehoe Bivor, und finally
turned int. the Leavanwerth holdin: j:ormis on icicle creak.
_
Ween
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