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Inter. J. of Marine Science 2012, Vol.2, No.2, 12
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12
Table 1 Average value of physic and chemical markers of water in Cienfuegos Bay in 2011
Parameter Unit
Level
February
May
November
Mean
Min.
Max.
Mean
Min
Max
Mean
Min
Max.
Temp.
℃
Surface
24.59
24.02
26.65 29.37
23.53
30.5
27.09
26.08
28.44
Bottom
24.25
23.30
24.55 28.99
23.3
30.48 27.87
26.89
28.56
Salinity
ups
Surface
35.73
35.51
35.95 36.65
35.81
36.98 32.62
27.37
34.67
Bottom
35.71
34.97
35.96 36.71
35.57
36.98 34.29
32.20
35.35
DO
mg/L Surface
5.38
4.45
6.02 4.60
1.56
6.68 5.87
4.66
6.67
Bottom
5.62
3.20
7.02 4.87
2.54
6.67 4.26
2.05
6.10
DO
%
Surface
79.72
66.8
89.5
73.8
25.1
108.1 88.3
71.0
98.9
Bottom
82.59
45.1
103.4
77.83
47.2
107.9 65.26
16.8
94.2
Figure 3 Spatial salinity distribution in the months of May (a) and November (b) in Cienfuegos Bay in 2011
Dissolved Oxygen concentration was higher (
≥
5 mg/L)
in February (winter) and November (autumn) and the
least mean values occurred in May (Table 1). The
biggest differences between surface and bottom were
presented in November (Table 1), with mean of 1.61
mg/L, with less bottom levels. Spatial distribution
(Figure 4) generally shows minimum in the north
lobule and maximum in the south one.
2 Discussion
Green lipped mussel
Perna viridis
is found in different
marine environments. Nevertheless, hydrological
systems with temperatures between 26
℃
and 32
℃
,
with salinities of 27 psu to 33 psu, and with dissolved
oxygen of 4 mg/L to 7 mg/L, favor its growth rate and
surviving (Chatterji et al., 1984; Rajagopal et al.,
2006). In situ registered values in the sampled months
accomplished those ranges with mean values of
26.5
℃
, 35.38 psu and 5.1 mg/L respectively.
Values and marker variations are similar to those
obtained by other authors in this bay, and are related