A priliminaryreport on the ichthyofauna of YedayanthittuEstuary (Tamil Nadu, India) and rivulets draining into it
M. Eric Ramanujam 1 & R. Anbarasan 2
1,2 Pitchandikulam Bioresource Centre, Auroville,Puducherry 605101, India
Email: 1 tdef@auroville.org.in ; ericramanujam@yahoo.co.in ; 2 anbarasan_ecol@yahoo.com
Date of online publication 26 May 2009
ISSN
0974-7907 (online) | 0974-7893 (print)
Editor: M. Arunachalam
Manuscript
details:
Ms
# o1701
Received
05 January 2007
Final
received 21 January 2008
Finally
accepted 15 May 2009
Citation: Ramanujam, M.E.
& R. Anbarasan (2008). A priliminary report on the ichthyofauna of YedayanthittuEstuary (Tamil Nadu, India) and rivulets draining into it. Journal of
Threatened Taxa 1(5): 287-294.
Copyright: © M. Eric Ramanujam & R. Anbarasan2009. Creative Commons Attribution 3.0 Unported License.JoTT allows unrestricted use of this article in any
medium for non-profit purposes, reproduction and distribution by providing
adequate credit to the authors and the source of publication.
Acknowledgements:We are thankful to UBS for the materials and means to carry out this
study. We are also thankful to Dr. Rema Devi and Dr. T.J. Indra of
Zoological Survey of India, Southern Regional Station for their invaluable help
in identification of species.
For Figure, Images & Table
– Click here
Yedayanthittu Estuary is part
of the Kaliveli wetland complex which includes the Kaliveli Floodplain, UppukalliCreek and lowland streams draining into it. The ichthyofaunaof Kaliveli Floodplain and UppukalliCreek has already been assessed (Ramanujam2005). This report concerns the list of
species found in the estuary and and lowland streams.
Study
Area and Methods
TheKaliveli complex has already been described (Ramanujam 2005). Lowland drains behind KurumpuramReserve Forest (Villupuram District, Tamil Nadu) are
part of the Arni River complex and has its origin in
the Eastern Ghats.
Yedayanthittu or Muttukadu Estuary (12012’-12015’N & 70056’-8000’E)
extends from a little north of Marakkanam Road Bridge
to the point of confluence with the Bay of Bengal at Alamparai(Kancheepuram District, Tamil Nadu). It is an area of intertidal mudflats and salt
pans. It was once linked to Pulicat Lake via Chennai by the Buckingham Canal (Scott
1998). The feature of the estuary is
that during the monsoon season (September-mid November) the salinity is low
(<1600uS/cm), but during the rest of the year it is brackish
(1,600-4,800uS/cm), saline (4,800-51,500uS/cm) and even hypersaline(>51,500uS/cm) depending on the tides and proximity to the sea. The naturally occurring vegetation consists
of sea grasses such as Halophila ovalis, mangroves such as Avicenniamarina and Rhizophora sp. (the latter has
been planted lately) and algae such as Chaetomorpha,Enteromorpha, etc. A degraded mangrove swamp also exists whose
dominant vegetation includes Avicenniamarina, Salicornia brachiata,Arthrocnemum indicum, Suaeda maritima and Sesuvium portulacastrum.
The
study period was from January 2006 to December 2006. Specimens were collected randomly with local
fishermen all over the estuary. In addition, small fish stranded in pools when the water receeds (that commercialists ignore) were collected. Identification was based on Daniels (2002), Day
(1878), Jayaram (1981), Talwar& Kacker (1984), Talwar& Jhingran (1991) and Venkateswarlu& Rao (1986).
Results
and Discussion
A
total of 75 species were recorded under 14 orders and 37 families. Perciformesdominated with 32 species (42.66%). 47 species
were found exclusively in the estuary, 18 were in lowland streams and 10 species
occurred both in the estuary and freshwater. Oreochromis mossambicais the only exotic species.
Inventorisation of living
resources is of paramount importance to evolve conservation and management
strategies, especially when economically important species are involved. As of
date it is unfortunate that the Kaliveli Wetland has
received little attention (from the viewpoint of the ichthyologist), this
report gains importance as the Kaliveli Wetland has
been described as one of the two most important wetlands along the Coromandel
Coast of southern India (Perennou 1987; Perennou & Santharam 1990).
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