International Journal of Marine Science, 2017, Vol.7, No.16, 141-160
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breaking activities, etc. (ADB, 2004). It is obvious that huge amounts of toxic pollutants in its rivers and in the
Bay of Bengal are threatening aquatic life, particularly fish. Many cases of localized but severe environmental
problems, like fish kills, have been registered by the DOE, other institutions and by fisher folk (Bhouyain, 1983).
The invertebrate’s fauna is affected by the elimination of certain species, taxa which are universally affected by
metal mining and associated activities. Mollusks, crustacean, Platyhelminthes, oligochaetes and some groups
appear to behave inconsistently in response to metal pollution (Tyler and Buckney, 1973; Bhuyan et al., 2016;
Islam et al., 2016). Consequently, any form of critical investigation on estuarine living resources and their
environment can be considered as an important research in Bangladesh. As part of the estuarine study, this paper
review the living estuarine resources with their usefulness and their depletion due to pollution.
Figure 1 Map showing the study site (Map created by ArcGIS v.10.3)
1 Status of the Water Quality
1.1 Physico-chemical parameters of the Karnafully River
Industrialization increases the unsuitability of surface water and create pressure on ground water which have
negative impacts on human and aquatic organisms (Bhuyan et al., 2017). Physico-chemical parameters fluctuated
seasonally in the estuarine area (Khan and Mahmood, 1976; Quader, 1978; Paul, 1981; Hossain et al., 1988a;
Hossain et al., 1988b; Hossain, 1992; Islam, 1993; Uddin, 1993; Ahammod, 1995). The ranges of measured
parameters of water samples were 26.5-32ºC, 0.0-5.0‰, 7.5-7.9 and 2.28-2.91 mg/L for temperature, salinity, pH
and DO (Alam and Zafar, 2012) (Table 1).
Table 1 Physico-chemical parameters of the Karnafully river water (Source: Sarwar et al., 2010)
Sample id
Color
Odor
Tem.
(
°
C)
TSS
(mg/L)
TDS
(mg/L)
TS
(mg/L)
Turb
(FTU)
DO
(mg/L)
pH EC
(µs/cm)
BOD
(mg/L)
COD
(mg/L)
Salinity
(mg/L)
Patenga Sea
Beach
Nearly
colorless
Odorless 21
590
13200 13990 42.00 3.0-2.6 7.0 19920 163
390
6.20
Patenga Nevay
Academy
Nearly
colorless
Odorless 21
560
17500 18300 50.10 2.7-2.9 6.9 31340 178
380
6.50
Nevay
Academy
Nearly
colorless
Odorless 22
610
16100 16850 49.45 2.5
6.9 29900 195
420
9.20
15 no ghat,
opposite of
the KAFCO
Nearly
colorless
Odorless 23
513
18530 19210 48.23 2.3
7.0 31300 160
350
7.00
Dry Dock
Nearly
colorless
Odorless 23.5 360
15000 15490 38.54 0.70
6.9 29200 195
423
9.90
Shipping
Corporation
Nearly
colorless
Odorless 23.5 490
12590 13193 45.00 0.20
6.8 20700 200
425
6.70
