ENVIS Centre, Ministry of Environment & Forest, Govt. of India
Printed Date: Thursday, December 5, 2024
Ennore estuary
Ennor estuary
|
Name of the River
|
Kosathalaiyar
|
|
Place
|
Ennore
|
|
District
|
Tiruvellore
|
|
State
|
Tamil Nadu
|
|
Latitude
|
13° 15’N
|
|
Longitude
|
80° 19’E
|
|
Important land marks
|
Ennore
|
|
Average depth
|
2.5 m
|
|
pH
|
8.00
|
|
Water temperature
|
31.5° C
|
|
Nature of the Substratum
|
Hard-Muddy
|
|
Salinity
|
31 ppt
|
|
Alkalinity
|
196 ppm
|
|
Dissolved oxygen
|
3.91 ml/l
|
|
BOD
|
13.1 mg/l
|
|
Predominat Phytoplankton
|
Nitzschia longissima, Thallosiothrix frautiefeldii, Asterionella japonica, Navicula sp., Biddulphia mobiliensis, Ceratium furca
|
|
Commercially important shellfishes
|
Crassostrea madrasensis
|
|
Commercially important finsishes
|
Mystus gulio
|
|
Industrial effluent discharges
|
ETPS Industrial Effluent 4,49,000 liter/day
|
|
Sewage discharges
|
Domestic sewage 0.9 million gallons/day
|
|
Hazardous waste dumping
|
ETPS Fly ash
|
Image
Map
River Basin Map
Physico-chemical parameters
The variation of mean, standard deviation (SD) values of environmental variables in the Ennore estuary and the coastal water of Ennore, Chennai
|
Parameters
|
Ennore
Estuary Mean±SD
|
Ennore
Coastal water Mean±SD
|
|
Appearance
|
Clear,
colorless, odorless
|
Clear,
colorless, odorless
|
|
Temperature (ËšC)
|
29±0.05
|
29±0.04
|
|
pH
|
7.58±0.15
|
8.12±0.11
|
|
Salinity (‰)
|
27.56±1.22
|
33.70±1.75
|
|
Dissolved Oxygen (ppm)
|
5.3±0.65
|
6.7±0.91
|
|
Total Hardness (ppm)
|
5860±1.22
|
4640±1.34
|
|
Total Alkalinity (ppm)
|
157±1.46
|
76±1.11
|
|
Nitrite (mg/l)
|
0.82±0.28
|
0.21±0.41
|
|
Nitrate (mg/l)
|
9.37±1.15
|
4.47±0.89
|
|
Phosphate (mg/l)
|
1.02±0.11
|
0.57±0.06
|
|
Ammonia (mg/l)
|
1.68±0.60
|
0.53±0.79
|
|
Silicate (ppm)
|
2.41±0.26
|
1.01±0.35
|
Biological entities
List of Gobioid fishes recorded
|
|
Ennore estuary
|
|
Order : Perciformes
Suborder : Gobioidei
Family : Gobiidae
Subfamily : Gobiinae
|
|
Acentrogobius cyanomos (Bleeker)
|
+
|
|
A. ennorensis Menon & Rema Devi
|
+
|
|
A. globiceps Hora
|
+
|
|
A. madraspatensis Day
|
+
|
|
A. viridipunctatus (Cuv. & Val.)
|
+
|
|
Favonigobius reichei (Bleeker)
|
+
|
|
Glossogobius biocellatus (Cuv. & Val.)
|
+
|
|
G. giuris (Ham.)
|
+
|
|
Oxyurichthys microlepis (Blkr.)
|
+
|
|
O. tentacularis (Cuv. & Val.)
|
+
|
|
Oligolepis acutipennis (Cuv. & Val.)
|
+
|
|
Parachaeturichthys polynema (Blkr.)
|
+
|
|
Stigmatogobius javanicus (Blkr.)
|
+
|
|
Subfamily : Apocrypteinae
|
|
Parapocryptes rictuosus (Cuv. & Val.)
|
+
|
|
Pseudapocryptes lanceolatus (Bloch & Schn.)
|
+
|
|
Boleophthalmus boddarti (Pallas)
|
+
|
|
B. sculptus Gunther
|
+
|
|
Subfamily: Periophthalminae
|
|
Periophthalmus variabilis Eggert
|
+
|
|
Family : Taenioididae
Subfamily : Taenioininae
|
|
Taenoides anguillaris (Linnaeus)
|
+
|
|
T. buchanani (Day)
|
+
|
|
Brachyamblyopus urolepis (Bleeker)
|
+
|
|
Subfamily : Trypaucheninae
|
|
Trypauchen vagina (Bloch & Schn.)
|
+
|
|
Ctenotrypauchen microcephalus (Blkr.)
|
+
|
References
Raghunathan, M.B. and K. Rema Devi, 2007. Threat to the biodiversity of the Ichthyofauna (Gobioids) of certain estuaries. Indian Hydrobiology, 10(2): 257–261.
Mohan Raj, V., S. Padmavathy and S. Sivakumar, 2013. Water quality parameters an it influences in the Ennore estuary and near coastal environment with respect to industrial and domestic sewage. International Research Journal of Environment Sciences, 2(7): 20–25