164 
PACIFIC SCIENCE, Vol. XVII, April 1963 
to keep the fish in an excited state. During con- 
trol conditions, water from another bucket of 
sea water was siphoned into the test area of the 
compartment containing the four blinded black- 
tip sharks. The siphon was then switched to the 
bucket of water which either contained the fish 
or from which the fish had been removed. The 
usual observations were made during a series 
of control and test periods. 
The results are included in Table 6. The 
blinded blacktip sharks showed an attraction re- 
sponse in most of the experiments with the 
"grouper water” and in the one experiment with 
"eel water” ( Gymnothorax ). It was concluded 
that the water in which these fish had been con- 
fined contained some substance which was at- 
tractive to the sharks. The blinded blacktips did 
not show a noticeable attraction response to 
"blacktip water.” 
During the winter of 1959-60 similar ex- 
TABLE 8 
Response of Normal Blacktip Sharks (nb) and Blinded Blacktip Sharks (bb) to 
Human Sweat at Eniwetok Laboratory, 1959 
DATE 
(1959) 
TIME 
TANK 
SHARKS 
SWEAT 
(ML) 
DONOR, DATE 
ACTIVITY INDEX 
RESPONSE* 
Controls 
Test 
8/8 
1905 
I (A-D) 
3NB 
0.3 
ALT 8/8t 
97.7 
65.9 
A? 
1930 
I (A-D) 
3NB 
0.3 
ALT 8/8+ 
— 
73.7 
R 
2115 
I (F-I) 
3BB 
0.3 
ALT 8/8+ 
67.6 
52.7 
R 
8/9 
1800 
I (F-I) 
2BB 
3.0 
ALT 8/8+ 
29.4 
14.1 
RR 
1945 
I (A-D) 
2NB i 
3.0 
ALT 8/8+ 
54.4 
41.7 | 
R 
8/10 
0845 
I (A-D) 
2NB 
3.0 
ALT 8/8+ 
54.0 
52.2 
O 
0925 
I (F-I) 
2BB 
3.0 
ALT 8/8+ 
45.0 
26.8 
R 
8/11 
2322 
I (F-I) 
2BB 
1 2-3 
TAP 8/11 
39.4 
25.0 
O? 
8/12 
0035 
I (A-D) 
2NB 
1 2-3 
TAP 8/11 
70.0 j 
58.8 
O? 
1910 
I (F-I) 
2BB 
3.0 
ALT 8/8+ 
29.5 
9.3 
RR 
2010 
I (A-D) 
2NB 
3.0 
ALT 8/8+ 
73.6 
61.9 
R 
8/13 
1553 
I (F-I) 
2BB 
3.0 
ALT 8/8+ 
33.0 
5.9 
RR 
1710 
! I (A-D) 
2NB 
3.0 
ALT 8/8+ 
68.2 
58.5 
R 
8/14 
1905 
I (F-I) 
2BB 
3.0 
ALT 8/14 
54.0 
| 35.3 
! RR 
I 
2025 
I (A-D) 
2NB 
3.0 
ALT 8/14 
67.0 
57.7 
R 
8/16 
1900 
I (A-D) 
2NB 
0.0 6 
ALT 8/14 
80.8 
77.8 
O 
1930 
I (A-D) 
2NB 
3.0 
ALT 8/14 
— 
74.2 
R? 
2010 
I (F-I) 
2BB 
3.0 
ALT 8/14 
9.2 
5.7 
R 
8/18 
1355 
! I (A-D) | 
2NB 
50.0 
ALT 8/8+ 
34.8 
17.5 
RR 
8/24 
2010 
| II (G-I) 
4BB 
10.0 
ALT 8/8+ 
85.7 
56.3 
RR 
8/25 
1515 
j II (G-I) 
IBB 
10.0 
ALT 8/8+ 
24.2 
1.9 
RR 
8/31 
1930 
I (F-I) 
2BB 
3.0 
ALT 8/31 
26.9 
12.2 
RR 
9/1 
2155 
I (F-I) 
2BB 
3.0 
ALT 8/31 
37.0 
32.0 
R 
9/3 
1450 
j I (F-I) 
3BB 
3.0 
ALT 8/8+ 
38.6 
13.5 
RR 
1900 
I (F-I) 
3BB 
3.0 
ALT 8/8+ 
53.0 
36.0 
R 
2145 
I (F-I) 
3BB 
3.0 
ALT 8/8+ 
49.6 
35.2 
R 
9/4 
1930 
! I (F-I) 
2BB 
3.0 
ALT 9/4 
j 37.0 
24.2 
R 
2145 
I (F-I) 
2BB 
3.0 
ALT 9/4 
j 38.0 
22.6 
R 
9/5 
1400 
I (F-I) 
2BB 
3.0 
ALT 8/8+ 
| 21.6 
12.2 
R 
* RR, strong repulsion; R, weak repulsion; O, no apparent response except sensing; A, 
attraction. 
f Sweat collected by sponge. 
weak attraction; A A, strong 
