Stichopus does not. Even though the former were washed and
scrubbed with the hand at the time of collection it is clear
that the specific activity of their body wall, which includes
the skin, is the higher.
That this is due to surface contam-
ination is further substantlated by the greater individual
differences in the specific activity of the body wall of H.atra.
Table 19 - COMPARISON OF RADIOACTIVITY OF TWO SPECIES OF SEA
CUCUMBERS COLLECTED AT AARAANBIRU POST SHOT
Thousands of d/m/g Wet Sample
Holothuria atra
Body wall
140
230
Gut & contents
Body wall
Gut & contents
4600
1100
8.5
5.4
64
6800
6.1
5.4
3600
110
4600
6.5
5200
17
Ave.
~Stichopus sp.
5800
7.2
2600
5800
4400
4200
The degree to which the food habit affects the specific
activity of the digestive tract and contents is found in 4 come
parison of the viscera of a pistol shrimp (Crangon sp.) and a
blue-green alga (Lyngbia sp.), which are intimately related
ecologically.
Two specimens of shrimp were found, one at Rig-
{141i and one at Runit, living in a completely closed cylinder
of the living algae.
The cylinders had to be torn open in
A similar if not the same assoc-
order to remove the shrimp.
{ation was reported by Taylor with specimens from Rongerik and
Bikini Atolls in the Marshall Islands .©
least in part,
This shrimp feeds at
upon the algae in which it lives.
- 102 “
It may how-