Environmental Engineering Reference
In-Depth Information
River but in headwaters of its tributaries have also
been mentioned under the relevant species.
tributaries. The freshly collected specimens were
preserved at fi rst in 3-4 % formaldehyde solution
in the fi eld itself and kept for about two days as
such putting locality labels with date. They were
then transferred to 8-10 % solution and fi nally
kept in alcohol for study. The larger specimens
were also injected with formalin solution for pre-
serving the internal viscera. Then the material
was identifi ed and the species were classifi ed as
per the latest literature.
Asan River and Its Tributaries
Asan is a major river of Western Doon Valley,
draining whole of it into the Yamuna. It originates
from a village Chandrabani (30° 20
′
N Lat. and
77° 38
E Long., at 704.2 m altitude) at the base of
Siwalik passing through Badowala, Jhajra,
Sahaspur, Sabhawala, Herbertpur and Dhalipur
(30°26 N Lat. and 77° 41
′
Systematic Account of Species
with Their Distribution
and Conservation Status and Threats
E Long., at 422.0 m alti-
tude) where it is converted in a reservoir and then
joins river Yamuna at Kulhal (near Paonta) which
makes border with Himachal Pradesh. It is fed
mainly by Tons nadi, Swarna nadi and Sitla rao
arising from the Lesser Himalayan side and a large
number of raos (seasonal streams) from Siwalik
ranges draining into it from the southern side and
the Tons and its tributaries from various narrow
gorges in their upper course like Robber's cave or
Guchhupani (Nalota nadi) from the northern side
in the southern slopes of Mussoorie. The raos usu-
ally remain dry during most of the year but show
marked increase in discharge and turn into torrents
during the monsoon period and carry huge boul-
ders in broad channels which are generally braided
with gravel beds. In the apparently dry beds, the
water generally fl ows under the gravel in many of
them. The Asan reservoir (also called Dhalipur
Lake) is situated at the confl uence of the Eastern
Yamuna Canal (coming from Dakpathar) and the
Asan River. Directly below the barrage on its east-
ern fl ank, the water re-enters the Eastern Yamuna
Canal on the west side of the Yamuna. At a dis-
tance of 4.5 km from the barrage on the canal, the
water reaches the Kulhal Power Plant, once dis-
charged from the power station; the water is con-
ducted by the canal 13 km to the Khara Power
Station in Uttar Pradesh.
′
Class: Actinopterygii
Order: Beloniformes
Family: Belonidae
Genus:
Xenentodon
Regan, 1911
1.
Xenentodon cancila
(Hamilton, 1822)
Esox cancila
Hamilton, 1822.
Fish. Ganges
:
213-215, 380, pl. 27, fi g. 70 (type locality:
ponds and smaller rivers of the Gangetic
provinces)
Xenentodon cancila
Husain,
2003
.
Faun. Asan
Wetland, Wetland Ecosystem Series 5
: 23-26
(Asan reservoir, Asan River above Kunja
Grant and below its barrage)
English Name
Freshwater Garfi sh.
Local Names
Sua, Cowa, Takla.
Localities Surveyed
Asan River above Kunja Grant and below its bar-
rage at Dhalipur; Herbertpur, Partitpur and
Bairagiwala villages near Herbertpur; Asan
Reservoir.
Methods
Diagnostic Characters
D. 0/14-18, P. 0/11, V. 0/6, A. 0/15-19, C. 15.
Both jaws prolonged like a beak; dorsal fi n
inserted usually anterior to a vertical through ori-
gin of anal fi n; caudal fi n truncate; lateral line on
The material was collected by using cast net and
bag nets and diverting the water in small stream/
channels, visiting various sites of the river and its
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