An overview of fish fauna of Raigad District, northern
Western Ghats, India
Unmesh Katwate 1, Rupesh Raut 2 &
Sahir Advani 3
1Bombay Natural History Society
Hornbill House, Opp. Lion Gate, Shaheed Bhagat Singh Road, Mumbai, Maharashtra
400001, India
2 Departmentof Zoology, Elphinstone College, Mumbai, Maharashtra 400032, India
3 Departmentof Zoology, The Institute Of Science, Mumbai, Maharashtra 400032, India
Email: 1theunmesh@gmail.com, 2 rupesh.raut@gmail.com (corresponding
author), 3 advani.sahir@gmail.com
Date of publication (online): 26 May
2012
Date of publication (print): 26 May
2012
ISSN 0974-7907 (online) | 0974-7893
(print)
Editor:Anonimity requested
Manuscript
details:
Ms # o2760
Received 12 April 2011
Final received 10 April 2012
Finally accepted 27 April 2012
Citation:Katwate, U., R. Raut & S. Advani (2012). An overview of fish fauna of
Raigad District, northern Western Ghats, India. Journal of Threatened Taxa 4(5): 2569Ð2577.
Copyright: ©
Unmesh Katwate, Rupesh Raut & Sahir Advani 2012. 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.
Author Details: Unmesh Katwateis a zoology postgraduate currently working as Research Scientist in Bombay
Natural History Society (BNHS). He is studying ecology and conservation aspects
of freshwater fishes and amphibians in northern Western Ghats. Currently he is
working on costal plateaus of Konkan in Western Ghats.
Rupesh Rautis a head of Department of Zoology, Elphinstone College. He works on ecology,
systematic biology and molecular phylogeny of freshwater fishes, amphibians and
bats of Western Ghats.
Sahir Advaniis currently a Research Associate at Dakshin Foundation, Bangalore, a marine
conservation NGO. His research interests lie in the field of marine protected
areas and coral reef associated fisheries. He is presently working on a project
profiling the fisheries of the Andaman Islands in order to establish critical
areas for research and conservation.
Author contribution: UK,
RR and SA all have contributed their efforts in extensive field work. RR
systematically designed this study. UK, RR and SA performed systematic
taxonomic identification, morphometric data analysis of different fish species
and manuscript preparation.
Acknowledgments: We are thankful
to Neelesh Dahanukar IISER, Pune for constant encouragement and extensive
taxonomic help as well as critical reading of the manuscript and suggesting
necessary changes. Authors are thankful to members of Wild Explorers (WE)
formerly known as WRRACC, India especially Aditya Sawant, Abhijit Gharat for
their unstinted help in the field. We thank to Ganesh Mehandale and his team for
on field helps in Roha. We also thank Principal, Elphinstone College, Mumbai
for constant encouragement. We are also thankful to authorities of the Bombay
Natural History Society for providing library facilities. Lastly we thank
anonymous referee for reviewing earlier draft of the manuscript.
Abstract:We studied the fish fauna of Raigad
District for two years from August 2008 to August 2010. Sixty six freshwater and secondary
freshwater fish species belonging to 31 families and 53 genera were collected
from various sampling sites and local markets along the banks of Patalganga,
Bhogawati, Amba, Kundalika, Mandad and Savitri river systems present in Raigad
District, Maharashtra, northern Western Ghats. Cyprinids were the most dominant group represented by 22
fish species belonging to 13 genera followed by the loaches, croakers and
gobies belonging to the family Balitoridae, Sciaenidae and Gobiidae
respectively (three species from each family). Of the 66 fish species, five
belong to the Vulnerable (VU), four to Near Threatened (NT), 37 to the Least
Concern (LC) category and 20 were found to be not evaluated for IUCN Red List
criteria. Raigad District is under
severe threat of rapid industrialization and urbanization. Further, introduced exotic fish species
are becoming a major threat to the indigenous fish fauna of Raigad
District. Implementation of
ecosystem based adaptation plans and conservation measures are necessary to
protect the diverse, endemic and threatened fish fauna of Raigad District.
Keywords:Fish fauna, Raigad District, species composition, species
diversity, threat status, Western Ghats.
For
figures, images, tables -- click here
The Western Ghats of India harbor rich biodiversity and are aptly
classified as one of the 34 Biodiversity Hotspots of the world owing to the
concentration of endemism (Mittermeier et al. 2005). The biodiversity of the Western Ghats is under severe threat
of deforestation (Myers 1990). Holding only 12,450km2 (i.e. 6.8%) primary vegetation out of
an original extent of 182,500km2 primary vegetation, Western Ghats
awaits major conservation priorities (Myers et al. 2000). The most important impact is the
massive degradation of habitat and extinction of species taking place in a
catastrophically short time scale (Novacek 2001), resulting in the modification
of both the identities and numbers of species in ecosystems (Tilman 1997).
The literature till date records 288 freshwater fish species from
the Western Ghats with 41% fish species endemic to this region (Dahanukar et
al. 2004). The fish fauna of
northern Western Ghats have been well studied but most of the studies are
limited to the east flowing rivers of the Western Ghats while the west flowing
rivers have had limited attention (Dahanukar et al. 2011). These west flowing rivers of the
northern Western Ghats flow in the Konkan region of Maharashtra, a narrow
coastal plain between the Western Ghats and the Arabian Sea. Raigad District forms the middle part
of Konkan in the northern Western Ghats. While very few studies are available on fishes of the Konkan region
(Annandale 1919; Kulkarni 1947; Bal & Mohmed, 1957; Singh & Yazdani
1988), the Raigad District is even less explored with only three studies (Singh
& Yazdani 1993; Arunachalam 2000, 2002) to our knowledge. In our present study we have carried
out a more extensive survey to document the diversity of fish fauna of Raigad
District and associated threats to the fish fauna.
Raigad District (Image 1) (17051ÕÐ19o80ÕN
& 72051ÕÐ73040ÕE) forms a major part of
northern Konkan and has the Western Ghats on its eastern and southern border
(Singh & Yazdani 1993); the eastern and southern part of the district lies
in the high rain shadow of the Sahyadri mountains; the altitude ranges from 500
to 1000 m. The annual rainfall
ranges from 3000 to 5500 mm in high altitude regions like Matheran. Rainfall decreases in the range of 2000
to 2500 mm as we go from south to north (Chaudhari 1993). Six major west flowing rivers, namely
Patalganga, Bhogawati, Amba, Kundalika, Mandad and Savitri with their
tributaries, originate from the eastern boundaries of Raigad District and drain
into the Arabian Sea (Image 1). These six major rivers with undulating terrains have tropical semi
deciduous, semievergreen and some evergreen forest patches in their
catchments. In the last few
decades, urbanization, industrialization and increasing organic waste load in
Raigad District threaten the icthyofauna of these rivers.
During the present survey six sampling sites (Image 1) namely
Kharpada (18050Õ42ÓN & 73007Õ20ÓE), Pen (18044Õ03ÓN
& 73006Õ49ÓE), Wadkhal (18035Õ41ÓN & 73006Õ10ÓE),
Roha (18026Õ03ÓN & 73010Õ36ÓE), Mandad (18020Õ37ÓN
& 73007Õ52ÓE) and Mahad (18005Õ20ÓN & 73026Õ46ÓE)
situated on the course of Patalganga, Bhogawati, Amba, Kundalika, Mandad and
Savitri rivers respectively were selected for experimental fishing. Samples were also collected from local
markets and landing centers. For
the present study samplings were carried out at all six sampling sites on a
monthly basis from August 2008 to July 2011. Experimental fishing was carried out both by members of the
survey team as well as by using the expertise of local fisher folk. Different types of gear including cast
nets, gill nets, scoop nets (all with varying mesh sizes), traps and other
local contrivances were used for collecting the fishes allowing us to sample a
range of fish sizes and minimize the bias due to specific gear. At each sampling site different
microhabitats like water pools, riffles, cascade, falls, run and plunge were
assessed for sampling.
Representative specimens of all fish species were fixed in 4%
formaldehyde and transferred to the laboratory and stored in glass
bottles. We also visited local
fish markets and landing centers situated nearer to the sampling sites to
monitor and look for the presence of any species which were not available during
our experimental fishing. Samples
were subsequently identified by following standard literature (Jayaram 1991;
1999; 2010; Talwar & Jhingran 1991). The threat status of the fish species is adapted from IUCN. Red List of
Threatened Species-Version 2011.1 (IUCN 2011). Relative abundance was recorded for each species in each
river as rare, common and very common. If a species contributed < 5% or 5% of the total catch in a sample it
was considered as rare, if < 50% or 50% it was considered as common and if
the species contributed > 50% it was considered as very common.
A total number of 66 fish species belonging to 31 families and 53
genera (Table 1) were collected from the six sampling sites located along the
course of monitored rivers. Some of the fishes collected from various
rivers are shown in Image 2. Cyprinids
were the most dominant group represented by 22 species belonging to 13 genera,
followed by the loaches, croakers and gobies of the family Balitoridae,
Sciaenidae and Gobiidae respectively (3 species from each family). Kundalika River showed the maximum
species number (66 species) followed by Savitri River (64 species) and Amba (61
species). Patalganga River showed the least number of species (45 species)
(Fig. 1).
Singh & Yazdani (1993) have reported 106 freshwater and marine
fish species in the entire Konkan region of northern Western Ghats of which 41
fish species were recorded from Raigad District. Arunachalam (2000) and
Arunachalam et al. (2002) studied Kundalika, Savitri River and Kal River a
major tributary of Savitri River as well as Phansad Wildlife Sanctuary
area. Arunachalam (2000) recorded
20 fish species, while Arunachalam et al. (2002) reported a total of 22 fish
species. Even though we could not record five species recorded by the earlier
workers we recorded 18 species for the first time from this area. A cumulative number of species based on
previous studies and the current study suggest that there could be at least 71
species of freshwater and secondary freshwater fishes in this region.
In our present study we recorded two bagrids Mystus bleekeri and M. malabaricus. There are earlier records of occurrence
of M. seenghala (nowSperata seenghala),M. vittatusand M. keletiusin Raigad District (Singh & Yazdani 1993) but during the present study
these species were not recorded. Arunachalam (2002) has reported the occurrence
of juveniles of Tor khudreefrom Khandala Falls, an origin of Patalganga River. During the field study, issues of occurrence of Tor khudree with
local fishermen were discussed. As
per their knowledge this species is very rarely seen in the wild in this area
but is known to be cultivated in farms in some areas of Raigad District. We could not record the presence of Tor khudree in our
study. Nevertheless, even in the
absence of species like M.
seenghala, M.
vittatus, M.
keletius, Gonoproktopterus curmuca and Tor khudree recorded
earlier (Singh & Yazdani 1993; Arunachalam 2002), we have reported 18 new
records of fish species to Raigad District, namely Anguilla bengalensis, Cirrhinus cirrhosus, Crossocheilus
latius, Esomus danrica, Garra gotyla stenorhynchus, Labeo calbasu, Puntius
chola, Parapsilorhynchus
discophorus, Ompok bimaculatus, Heteropneustes fossilis, Xenentodon
cancila, Monopterus indicus, Etroplus maculatus, Eleotris
fusca, Channa punctata, C. gachua, Chanda nama and Mastacembalus armatus. Our study also reported eight new records of introduced fish species to
this region like Catla catla,Cirrhinus mrigala, Ctenopharyngodon idella, Cyprinus carpio, Labeo rohita, Clarias gariepinus, Gambusia affinis and Poecilia reticulata. Puntius cf. amphibius collection reported in the present study has ambiguous
taxonomic status. Pethiyagoda
& Kottelat (2005, p.151) considered Puntius amphibius from its lectotype which
was preserved some two centuries ago from Bombay Presidency, a rather ill
defined type locality as it points to a very large region. Our Puntiuscf. amphibius specimens do not
match with the lectotype of Puntius
amphibius sensu stricto because of the presence of a dark oval blotch on
caudal peduncle, which is absent in lectotype studied by Pethiyagoda &
Kottelat (2005, p.150). Pethiyagoda & Kottelat (2005, p.150) distinguished Puntius amphibius from Puntius mahecola by having a smaller eye
diameter (61.6% of snout length, vs. 68.4Ð100.0 %). Eye diameter of our Puntius cf. amphibius collection ranges between 71Ð98 % of snout length,
which falls closer to P. mahecola, a
species restricted to southern Western Ghats (Pethiyagoda & Kottelat 2005). Such variations between our Puntius cf. amphibius collection and lectotype of Puntius amphibius studied by Pethiyagoda & Kottelat (2005)
suggest that there is a need to reinvestigate Puntius amphibius from its type locality with a fresh collection.
Out of the recorded 66 fish species, five species are categorized
as vulnerable globally. These
species are Cirhinus
cirrhosus, Cyprinus carpio, Devario fraseri, Parapsilorhynchus discophorusand Monopterus indicus(IUCN 2011). Western Ghats
endemics like Devariofraseri, Garra
gotyla stenorhynchus, Puntius sarana subnasutus, Parapsilorhynchus discophorus,Nemachilichthys rueppelli, Mystus malabaricus and Monopterus indicus constitute 10%
to the total fish species of the study area. The global threat status of the studied fish species shows
that 7.5% belong to Vulnerable (VU), 6% to Near Threatened (NT), 56% to Least
Concern (LC) while 3% has Data Deficient (DD). The status of around 26% species
was not available (Fig. 2). Kundalika, Savitri and Amba show maximum contribution (6Ð7.5 %) of
globally vulnerable species in their species assemblages (Table 2).
Raigad District is showing rapid industrialization. The fish fauna
of Raigad District is threatened mainly due to pollution, industrial sewage
disposal in river systems, habitat alteration due to construction of dams,
indiscriminate deforestation on a large scale, and over-exploitation of present
fish stock and introduction of exotic fish species. Nine introduced fish species like Catla catla, Cirrhinus mrigala,
Ctenopharyngodon idella, Cyprinus carpio, Labeo
rohita, Clarias gariepinus, Gambusia affinis, Poecilia reticulataand Oreochromis mossambicuswere collected from the different sampling sites which constituted about 13% of
the total fish fauna. Fishes like Catla catla, Cirrhinus mrigala and Labeo rohita were native
to the Ganges River systems and introduced in greater numbers for mass
aquaculture practices. Studies
suggest that native fish fauna of the Western Ghats are severely threatened by
the introduction of alien fish species with regard to predation, competition
for food and other resources, and also with the introduction of new pathogens (Daniels
2006; Raghavan et al. 2008; Krishnakumar et al. 2009; Knight 2010). These exotic populations have the
status of potential pests and hence pose a serious threat to the fish fauna of
Raigad District, especially to the endemic and threatened species having a low
population size.
It is recommended that further long term intensive monitoring
studies are needed to trace the impact of anthropogenic activities on the
freshwater fish fauna of Raigad District. Implementation of conservation measures are also necessary to protect
the locally, as well as globally threatened freshwater fish species from this
area.
References
Annandale, N. (1919). Bombay streams fauna: notes on fresh water fish mostly from the
Satara and Poona Districts. Records of
the Indian Museum 16: 125Ð138.
Arunachalam, M. (2000). Assemblage structure of stream fishes in
the Western Ghats (India). Hydrobiologia430(1Ð3): 1Ð31.
Arunachalam, M., A.
Sankaranarayanan, A. Manimekalan, R. Soranam & J.A. Johnson (2002). Fish fauna of some streams and rivers in the Western Ghats of
Maharashtra. Journal of Bombay Natural
History Society 99(2): 337-341.
Bal, D.V. & Mohmed
(1957). A systematic account of
the eels of Bombay. Journal
of the Bombay Natural History Society 54(3): 732Ð740.
Chaudhari, K.K. (1993). Gazetteer of the Raigad
District. Maharashtra State
Gazetteers Department, Govt. of Maharashtra, 30Ð42pp.
Dahanukar,
N., R. Raut & A. Bhat (2004). Distribution, endemism and
threat status of freshwater fishes in the Western Ghats of India. Journal of Biogeography 3(1):
123Ð136.
Dahanukar, N., R. Raghavan,
A. Ali, R. Abraham & C.P. Shaji (2011). The status and distribution of freshwater fishes of the
Western Ghats, pp. 21Ð48. In: Molur, S., K.G. Smith, B.A.
Daniel & W.R.T. Darwall (compilers). The Status of Freshwater Biodiversity in The Western Ghats, India.International Union for Conservation of Nature (IUCN) Gland, Switzerland &
Zoo Outreach Organization (ZOO) Coimbatore, India, 116pp.
Daniels, R.J.R. (2006). Introduced fishes: a potential threat to the native freshwater
fishes of peninsular India. Journal of
the Bombay Natural History Society 103(2Ð3): 346Ð348.
IUCN (2011). IUCN Red List of Threatened Species. Version 2011.1.
<www.iucnredlist.org>. Downloaded on 09 August 2011.
Jayaram, K.C. (1991). Revision of the Genus Puntius Hamilton from the
Indian Region (Pisces: Cypriniformes, Cyprinidae, Cyprininae). Occasional
Paper No. 135. Records of the Zoological Survey of India, Kolkata, 178pp.
Jayaram, K.C. (1999). The Freshwater Fishes of
the Indian Region. Narendra Publishing
House, New Delhi, 551pp.
Jayaram, K.C. (2010). The Freshwater
Fishes of The Indian Region. Second Edition. Narendra Publishing
House, Delhi, 616pp.
Knight,
J.D.M. (2010). Invasive ornamental fish: a
potential threat to aquatic biodiversity in peninsular India. Journal of Threatened Taxa 2(2):
700Ð704.
Krishnakumar, K., R.
Raghavan, G. Prasad, A. Bijukumar, M. Sekharan, B. Pereira & A. Ali (2009).When pets become pests - exotic aquarium fishes
and biological invasions in Kerala, India. Current Science 97(4): 474Ð476.
Kulkarni, C.V. (1947). Notes on freshwater fishes of Bombay and Salsette Islands. Journal of the Bombay Natural History
Society 47(2): 319Ð326.
Mittermeier, R.A., P.R.
Gil, M. Hoffman, J. Pilgrim, T. Brooks, C.G. Mittermeier, J. Lamoreux, &
G.A.B. da Fonseca (2005). Hotspots Revisited: EarthÕs
Biologically Richest and Most Endangered Terrestrial Ecoregions. Cemex,
Mexico, 392pp.
Myers, N. (1990). The biodiversity challenge: expanded hotspots analysis. The
Environmentalist 10:
243Ð256.
Myers,
N., R.A. Mittermeier, C.G. Mittermeier, G.A.B. Da Fonseka & J. Kents (2000).Biodiversity hotspots for conservation
priorities. Nature 403: 853-858.
Pethiyagoda, R. & M.
Kottelat (2005). The identity of the South
Indian Barb Puntius mahecola (Teleostei:
Cyprinidae). The Raffles Bulletin of
Zoology (Supplement No.) 12: 145Ð152.
Raghavan, R., G. Prasad,
P.H. Anvar-Ali & B. Pereira (2008). Exotic
fish species in a global biodiversity hotspot: observations from river
Chalakudy, part of Western Ghats, Kerala, India. Biological Invasions 10(1): 37Ð40.
Singh, D.F. & G.M.
Yazdani (1988). A note on the ichthyofauna
of Sanjay Gandhi National Park, Borivli, Bombay. Journal of the Bombay Natural History Society85: 631Ð633.
Singh, D.F. & G.M.
Yazdani (1993) Ichthyofauna of Konkan Region of Maharashtra (India).Occasional paper no. 145, Records of the Zoological Survey of India, Kolkata,
46pp.
Talwar, P.K. & A.G.
Jhingran (1991). Inland Fishes of India and Adjacent Countries. Oxford-IBH Publishing Co. Pvt. Ltd., New Delhi, 1158pp.
Tilman, D., J. Knops, D.
Wedin, P. Reich, M. Ritchie & E. Siemann (1997). The influences of functional diversity and composition on
ecosystem processes. Science277: 1300Ð1302.