321
In coastal West Bengal and adjacent estuarine systems, the seasonal variation of
surface water temperature is not drastic between premonsoon and monsoon seasons. The premonsoon period (March to mid-June) is characterized by a mean
surface water temperature around 34 °C. The monsoon perod (mid-June to October)
shows a surface water temperature around 32 °C (mean) and the postmonsoon
period (November to February) is characterized by cold weather with a mean surface water temperature around 23 °C (Mitra 2000).
Surface Water Salinity
In context to Indian Sundarbans, the aquatic salinity is the principal regulating
component influencing spawning, growth and survival of oyster species. The spatial variation of salinity in different locations of Indian Sundarbans may be attributed to the proximity of the station to the coastal Bay of Bengal where the average
Table 9.13 Monthly variation of oyster population density (No. m
−2
) at three stations in Indian
Sundarbans Biosphere Reserve
Month
Station I
(Sagar light
house)
Station II
(Henry’s island – first sluice
gate)
Station III
(Henry’s island – second sluice
gate)
June’87 629.6
154.9
200.8
July
601.5
152.7
184.1
August 498.7
131.7
178.3
Sept
493.8
130.9
178.2
Oct
493.0
130.3
175.3
Nov
486.9
128.7
171.7
Dec
486.4
124.3
170.8
Jan’88 465.9
125.0
168.9
Feb
465.3
124.8
165.8
March 564.6
123.4
169.2
Apr
617.8
169.0
190.6
May
624.7
164.5
189.4
June
623.9
161.1
179.2
July
611.8
144.9
158.0
August 586.8
152.0
153.6
Sept
501.2
129.1
133.8
Oct
500.9
129.8
130.7
Nov
500.2
126.4
129.0
Dec
496.5
126.1
128.9
Jan’89 488.8
124.8
128.3
Feb
486.1
124.1
128.1
March 485.7
123.6
139.5
Apr
511.2
161.0
156.8
May
519.9
164.2
161.3
Surface Water Salinity
In coastal West Bengal and adjacent estuarine systems, the seasonal variation of
surface water temperature is not drastic between premonsoon and monsoon seasons. The premonsoon period (March to mid-June) is characterized by a mean
surface water temperature around 34 °C. The monsoon perod (mid-June to October)
shows a surface water temperature around 32 °C (mean) and the postmonsoon
period (November to February) is characterized by cold weather with a mean surface water temperature around 23 °C (Mitra 2000).
Surface Water Salinity
In context to Indian Sundarbans, the aquatic salinity is the principal regulating
component influencing spawning, growth and survival of oyster species. The spatial variation of salinity in different locations of Indian Sundarbans may be attributed to the proximity of the station to the coastal Bay of Bengal where the average
Table 9.13 Monthly variation of oyster population density (No. m
−2
) at three stations in Indian
Sundarbans Biosphere Reserve
Month
Station I
(Sagar light
house)
Station II
(Henry’s island – first sluice
gate)
Station III
(Henry’s island – second sluice
gate)
June’87 629.6
154.9
200.8
July
601.5
152.7
184.1
August 498.7
131.7
178.3
Sept
493.8
130.9
178.2
Oct
493.0
130.3
175.3
Nov
486.9
128.7
171.7
Dec
486.4
124.3
170.8
Jan’88 465.9
125.0
168.9
Feb
465.3
124.8
165.8
March 564.6
123.4
169.2
Apr
617.8
169.0
190.6
May
624.7
164.5
189.4
June
623.9
161.1
179.2
July
611.8
144.9
158.0
August 586.8
152.0
153.6
Sept
501.2
129.1
133.8
Oct
500.9
129.8
130.7
Nov
500.2
126.4
129.0
Dec
496.5
126.1
128.9
Jan’89 488.8
124.8
128.3
Feb
486.1
124.1
128.1
March 485.7
123.6
139.5
Apr
511.2
161.0
156.8
May
519.9
164.2
161.3
Surface Water Salinity