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the coral used was withoot the ofl scum and had ne count above
background on the survey meter. The fish in #6 has likewise fed
regularly,
Aquaria #1, 3 and 4 were retained as controls,
Six larger aquaria, 12" x 24" x 16", were set up originally
but were not as satisfactory as the setup for the smaller aquarina
described above,
The large aquaria are now being used as supply
tanks for fish and other marine animals as well as for an irradiation
mortality experiment with the marine snail, Thaislamsliosa.
On April 14th six more of the smaller aquaria were delivered and
were set up in the same manner as those for the fletfish,
Tide
Pool johnnies, a sculpin, Oligocuttus maculosus, were placed in these
aquaria,
They have not yet been used axperimentally but seem well
adapted to their new environment.
fhe experiment in aquaria #2 and #5 will be contined until it is
believed that the fish is about to die,
At that time tissues will be
preserved for histological studies,
Project VI.
Observations on the amphipods were discontimed because of
high mortalities among the controls.
Varine snails, Thais lamellosa,
A report will be submitted.
that had been surviving well
and X-rayed on April 2,
Exposures given, and mumbers of snails
e
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in 15-gallon aerated aquaria, were individually marked with a number
irradiated, were: 10,000 r - 23; S00 r - 6; 200 r- 9)
SO r=- 93 and 200 r~- 9,
1250 r = 93
After 3 weeks the mortalities among irra-
diated and control snails were approximately equal,
The snails
spawned in the aquaria, attaching their egg cases to rocks, shells,
and especially to the glass sides of the aquaria.
When only a few
egg cases were deposited, thelr positions were recorded along with
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