162
Table 1. Effect of algal densities, temperature and conductivity on survival,
growth and maturation of S. proboscideus: Analyses of variance.
Variable
Source of
df
SS
MS
F
variation
Algal
Survival
6
178217.84
29702.97
406.2***
density
Error
14
1023.65
73.12
Growth
2
223.38
111.68
116.4 ***
Error
6
5.76
0.96
Maturation
4
7.47
1.86
79.1 ***
Error
10
0.24
0.02
Temperature
Survival
3
48455.00
16151.66
169.3***
Error
8
763.33
95.41
Growth
2
465.88
232.94
124.4***
Error
6
11.24
1.87
Maturation
2
640.89
320.44
192.3***
Error
6
10.00
1.67
Conductivity
Survival
7
7995.63
1127.97
10.0***
4d
Error
16
1800.00
112.50
Growth
7
9.27
1.32
8.1***
Error
16
2.59
0.16
7d
Survival
7
9865.68
1409.38
8.2***
Error
16
2750.00
171.88
Growth
7
47.54
6.79
23.4 ***
Error
16
4.65
0.29
*** '" p E
,.....
IU
>
.....
>
c...
40
'"
en
20
0
135. 260
375
675
2010
Conductivity of medium (pS cm- 1 )
Fig. 7. Effect of conductivity of culture medium on survival (mean±S.D.) of S. proboscideus after 4 and 7 days.
food concentrations, SIze of S. proboscideus supplied with different food levels showed a similar
trend (Fig. 2). Test animals succumbed at the lowest
and highest food levels. At intermediate food levels
(5 X 10 3 , 1 X 10 4 and 5 x 10 4 cells ml- I ) growth was
stabilized at about day 10. Repeated-measures ANOVA revealed a highly significant (p<0.001) influence