Table 18-2. Mean linear velocites (MLV) of various hatches of 
stage II Balanus amphitrite nauplii at 20°C. 
Hatch 
No. 
N 
MDP 
(sec) 
MLV ± sd 
(mm/sec) 
3 
40 
7.0 
0.75 ± 0.34 
8 
57 
5.3 
0.72 ±0.20 
9 
14 
6.1 
0.65 ±0.43 
14 
24 
9.0 
0.71 ±0.23 
24 
23 
7.4 
0.72 ±0.27 
25 
20 
7.0 
0.85 ±0.33 
NOTE: N = number of paths analyzed, MDP = mean duration of paths 
analyzed. 1 1 ' * ' ’ 1 1 f 
% 
30 .. 
20 -• 
10 - 
0 
30 
20 -■ 
10 .. 
0 
30 .. 
20 - 
10 
—I- >~ 
1 
M M/SEC 
D 
Figure 18-4. Examples of mean linear velocity (mm/sec) dis¬ 
tribution within five test groups of stage II barnacle nauplii: 
NOTE: A) Balanus improvisus from Rhode Island at 20°C, B) Chthamalus 
fragi/is at 20°C, C) Balanus amphitrite control, D) B. amphitrite with 24 hr. 
exposure to 20 ppb Cu, E) B. amphitrite with 24 hr. exposure to 350 ppb Cu. 
N = number of paths per group. 
279 
