Diversity, threats and conservation of catfish fauna of the Krishna
River, Sangli District, Maharashtra, India
Suresh M. Kumbar 1 & Swapnali B.
Lad 2
1,2 Department of Zoology,
Arts, Commerce and Science College, Palus, Sangli District, Maharashtra 416310,
India
1 smkumbar@rediffmail.com (corresponding author), 2 swapnalilad33@yahoo.com
Abstract: The diversity of freshwater catfish
species of the Krishna River, Sangli District was studied from June 2009 to
July 2012. The study area covered
105km from Karad City where the Koyna tributary joins the Krishna River up to
Mhaishal, the state border of Maharashtra. It was divided into three streams for convenience, i.e., the upper
stream starts from Karad and goes up to Takari, the middle stream from Takari
to Bhilawadi and downstream from Bhilawadi to Mhaishal. A total of 13 species of catfish
belonging to five families and 10 genera were recorded. The Bagridae family was dominant with
six species, whereas Siluridae, Schilbidae and Clariidae had two species each
and Sisoridae with one species. We
have provided range extension for an endemic and threatened sisorid catfish Glyptothorax
poonaensis. The occurrence and distribution of catfishes was more or less
equal in number along the study area. The maximum number of species recorded was nine from the upper stream,
whereas the middle and down streams had eight and seven species
respectively. The distribution of
catfish along the Krishna River system may be due to the slow and steady state
water movement and its width that ensure the continuous availability of
nutrition. It is suggested that the
Krishna River would be a suitable habitat for the conservation of freshwater
catfish if the threats are minimized.
Keywords:Catfish, checklist, conservation, Krishna River,
threats.
doi: http://dx.doi.org/10.11609/JoTT.o3394.5362-7 | ZooBank: urn:lsid:zoobank.org:pub:A6E05DC9-D7DF-4CA0-B2A7-119B76E28323
Editor: Neelesh Dahanukar, IISER, Pune, India. Date
of publication: 26 January 2014 (online & print)
Manuscript details: Ms #
o3394 | Received 18 October 2012 | Final received 16 November 2013 | Finally
accepted 12 December 2013
Citation: Kumbar, S.M. & S.B. Lad (2014).Diversity, threats
and conservation of catfish fauna of the Krishna River, Sangli District,
Maharashtra, India. Journal
of Threatened Taxa 6(1): 5362–5367; http://dx.doi.org/10.11609/JoTT.o3394.5362-7
Copyright: © Kumbar & Lad 2014. Creative Commons
Attribution 3.0 Unported License. JoTT allows unrestricted use of this
article in any medium, reproduction and distribution by providing adequate
credit to the authors and the source of publication.
Funding: University Grants Commission (UGC), Western Regional
Office, Pune (No. F. 47–1718/10 (WRO).
Competing Interest: The
authors declare no competing interests. Funding sources had no role in study
design, data collection,
resultsinterpretation and manuscript writing.
Acknowledgements: Authors are
thankful to Dr. Satyawan S. Patil and Mr. Abhijit B. Ghadage, Department of
Zoology, for their help in field work and support. We
thank Management and Principal for providing laboratory facilities. We are
thankful to Dr. Pankaj Bhatnagar, Officer-in-charge, and Dr. Shrikant Jadhav,
Zoological Survey of India, Western Regional Center, Pune for confirmation of
identified fish species and their suggestions for improving the manuscript. Miss.
Swapnali B. Lad is thankful to Shivaji University, Kolhapur and SGM College
Karad, for providing research laboratory facilities. SMK thanks the University
Grants Commission, Western Regional Office, Pune for
financial assistance to Minor Research Project.
For figures, images, tables -- click here
The Krishna River is
one of the major perennial rivers, which originates at Mahabaleshwar Hills (17058’N
& 73043’E) in the Western Ghats of Maharashtra, at about 1337m
above sea level and flows as the Krishna River system across the whole width of
the peninsula from west to east for a length of about 1400km through the states
of Maharashtra, Karnataka and Andhra Pradesh. Krishna River is a boon for all these
three states and has made possible remarkable agricultural and industrial
development. Moreover, it provides
food and shelter to a large number of aquatic fauna. In Maharashtra, the major tributaries of
Krishna River are Koyna, Yerla, Urmodi, Warna, Panchaganga, and Dudhganga.
The study area for
the current investigation starts from Karad City where the Koyna tributary
joins the Krishna River up to Mhaishal, the state border of Maharashtra. It
receives an annual rainfall of about 300–500 mm from June–October
and frequently undergoes drought and flooding. The maximum temperature reaches up to 410C
during summer and a minimum temperature of 100C in winter. The type of vegetation is dry deciduous
forest (Kumbar & Patil 2010). The total study area covered approximately 105km from Karad City to
Mhaishal.
India, being a
mega-diverse country, harbors 197 species of catfish (Jayaram 2009). In recent
years much interest has developed in the study of the phylogeny and taxonomy of
the order Siluriformes as a whole (Jayaram 2009). A lot of information has been
accumulated in the field of diversity, density, threats and conservation of
freshwater fish fauna of the Krishna River system (Arunachalam 2000; Kharat et
al. 2003, 2012; Dahanukar et al. 2004, 2012; Chandanshive et al. 2007; Sarwade
& Khillare 2010; Vijaylaxmi et al. 2010; Jadhav et al. 2011). Some studies on the diversity of fish
fauna of Satara are also available. Silas (1953) studied the fish fauna of Mahabaleshwar and Wai in Satara
District and recorded 14 species, recently Kharat et al. (2012) have given an
updated checklist of fish fauna of the Krishna River at Wai and Dhom reservoir
and reported the presence of 51 species. Annandale (1919) reported 18 species in Yenna River at Medha in Satara
and Jadhav et al. (2011) reported 58 species in Koyna River. Although extensive surveys have been
conducted in the Krishna River system (David 1963; Jayaram 1995) they did not
provide a separate list of catfish species of the present study area. Recent
reviews have highlighted a paucity of data on the fish fauna of the Western Ghats rivers (Kharat et al. 2003, 2012;
Dahanukar et al. 2011b, 2012). Therefore, the present work was undertaken to determine the status,
threats and conservation measures of catfish fauna of the Krishna River, Sangli
District.
Materials and Methods
The catfish were
collected in the Krishna River from Karad to Mhaishal whichis approximately 105km in length. The study area was divided into three streams
for convenience i.e., upper, middle and down streams (Fig. 1). The study area included 13 collection
sites (Karad, Bahe, Borgaon, Takari, Dudhondi, Amanapur, Burli, Ramanandnagar,
Bhilwadi, Digraj, Sangli, Miraj, and Mhaishal) with inter point distance of 8-9
km. The upper stream starts from Karad (17045’N & 74037’E),
Satara District where the Koyna River joins the Krishna (Preeti Sangam)
followed by Bahe, Borgaon, and Takari sites. The middle stream included Dudhondi,
Amanapur, Burli, Ramanandnagar (17040’N & 74025’E),
and Bhilwadi sites and Yerla tributary joins the Krishna near Sangli City on
the left. Downstream includes
Digraj, Sangli, Miraj and Mhaishal (16041’N & 74044’E)
sites and two major tributaries, Warana and Panchaganga whichjoin the Krishna at Haripur and Narsinh Wadi on the right side. Collections of catfish were made between
0600–1900 hr with the help of local fishermen by using different mesh
sized nets, such as gill nets, cast nets and hooks etc. Alternatively, fish
were also purchased from the fishermen on the spot and the local fish markets.
The fish were categorized as common, moderate, and rare species on the basis of
observation of the number of fishes in the total collection. Suitable sized specimens were selected
from the collection, immediately photographed using digital SLR camera (Canon
EOS - 1100D) and then fixed in 10% formalin. The specimens were brought to the
laboratory and identified with the help of standard keys mentioned in the
taxonomic literature i.e., Talwar & Jhingran (1991),
Jayaram (2009), and Jayaram (2010). The identified species were confirmed at Zoological Survey of India,
Western Regional Centre, Pune. All identified specimens are deposited
at the Department of Zoology, Arts, Commerce and Science College, Palus, Sangli
District, Maharashtra, under the accession numbers from ZID 20-32.
Results
In the present study
13 species of catfish belonging to five families and 10 genera of Siluriformes
were collected from the Krishna River in Sangli District during the three-year
study period. The scientific name,
family, collection sites and status of each catfish species is given in Table
1. A maximum of six species were
recorded in the Bagridae family followed by two species in Siluridae,
Schilbidae and Clariidae and one species in Sisoridae (Table 1, Images 1a-m). The occurrence and distribution of
catfish along the river was more or less equal with much overlapping within the
species (Table 2, Fig. 2).
A maximum of nine
species of catfish were recorded in the upper stream (Mystus seengtee, M.
malabaricus, Rita gogra, R. kuturnee, Sperata seenghala, Proeutropiichthys
taakree, Neotropius khavalchor, Wallago attu and Glyptothorax poonaensis),
eight species in the middle (M. seengtee, R. kuturnee, S. seenghala, Ompok
bimaculatus, P. taakree, N. khavalchor, Heteropneustus fossilis, andClarius gariepinus) and seven species in the downstream (M. seengtee, M.
bleekeri, R. kuturnee, S. seenghala, W. attu, O. bimaculatus, and C.
gariepinus) of the river. Species such as Mystus seengtee, R. kuturnee and S.
seenghala (Fig. 2, Images 1a,e,f) were commonly
observed in all the streams. The
exotic species C. gariepinus (Image 1l) was found in the middle and
downstreams in moderate numbers.
Four species of
catfish fall under the threatened and near threatened categories as per recent
IUCN Redlist 2011. Among these, G.
poonaensis (Image 1m) has been designated as Endangered (EN) species while M.
malabaricus, W. attu and O. bimaculatus(Images 1c, g, h) species have been considered as Near Threatened (NT). Abundance of these species populations
was moderate to rare in the present study area of Krishna River. Neotropius
khavalchor (Image 1j) has been considered as Data Deficient (DD) because of
lack of substantial information for IUCN Red Listing.
Discussion
The
catfish diversity has been studied by different researchers in the country. For example, there are seven species in Karala River, West Bengal (Patra
2011), ten species in the wetlands of Shivamogga District, Karnataka (Kiran
2011) and 17 species in River Kelo and Mand in Raigharh District, Chhattisgarh,
India (Tamboli & Jha 2012). Although, a few studies are available on diversity and conservation of
freshwater fish fauna of Krishna River system at Satara District, Kharat et al.
(2012) reported six species of catfish, out of 51 species of freshwater fishes
from Krishna River at Wai and Dhom reservoirs. Dahanukar et al. (2012) reported
11 species of catfish, out of 57 species of freshwater fishes of Indrayani
River, a tributary of Bhima River. Jadhav et al. (2011) reported 10 species of catfish of a total 58
species, close to the present study area; their data is confined only to Koyna tributary which is a major tributary of Krishna, which joins
it at Karad City. Our study area
starts from Preeti Sangam and extends towards the east where Yerala, Warana and
Panchaganga tributaries further join the Krishna River.
The present study has
recorded 13 species of catfish which were spread
evenly in the lotic system of Krishna River. Among them G. poonaensis is
considered as Endangered (EN) species which was
collected from the Bahe site near Islampur. The species is endemic to the northern
Western Ghats and was only recently rediscovered after almost 70 years from
Indrayani River, a tributary of Bhima River of the Krishna River system
(Dahanukar et al. 2011a). Our
specimens resemble G. poonaensis redescribed by Dahanukar et al.
(2011a), but further study, including molecular analysis, is necessary to
validate the taxonomic status of this species available in Krishna River. The species is threatened by habitat
modifications caused by dams, rapid development in urbanization and increasing
pollution in this area (Dahanukar 2011a). Neotropius khavalchor, currently categorized under Data Deficient
(Dahanukar 2011b), was collected from Karad, Satara District and Dudhondi,
Sangli District. It is a very rare
species and has been considered as threatened by Menon (2004) by suggesting
that small changes in water quality is likely to have adverse effects and may
result in the loss of this species. This species was reported by many ecologists in
the Krishna River system. Panchaganga River near Kolhapur (Kulkarni 1952; Kalawar & Kelkar
1956), Krishna River Islampur (Kulkarni 1952), Krishna River near Sangli
(Jayaram 1995), Koyna River near Patan (Jadhav et al. 2011), Indrayani River
near Kamshet (Dhanukar et al. 2012). In Karnataka it is known from Krishna River at Jamkhandi (Jayaram 1995),
Tunga-Bhadra River (Shahnawaz & Venkateshwarlu 2009) and in Eastern Ghats
of Andhra Pradesh (Devi & Indra 2003). However, due to a lack of substantive information about this species, it
is considered as Data Deficient in the current IUCN Red List (Dahanukar 2011b).
Three species M.
malabaricus, W. attu and O. bimaculatus are
considered Near Threatened. The
major threat is overexploitation of these species for food and has resulted in
drastic population declines (Patra 2011). Threats also include
anthropogenic activities such as, habitat loss due to sand mining, pollution
and indirect mortality due to dynamite fishing in many parts of it’s range (Abraham 2011; Ng 2010; Ng et al. 2010). One exotic species C. gariepinuswas observed in the middle and downstream of the river. This species might have been introduced
to Krishna River system from the nearby aquaculture tanks/ponds and moved
through the tributaries which merge at middle and down
streams. The even distribution of catfish along the Krishna River system may be
due to the depth of water level that remains at 3–4 m even in summer which ensures the continuous availability of food and
shelter while in monsoon the level rises up to 10–12 m. The slow and steady water movement and
its width ensure the continuous availability of nutrition. In addition, the
bottom of the river has rich fertile clay with varied aquatic flora and
fauna. Hence, the present study
suggests that the Krishna River system is a suitable habitat for the
conservation of catfish.
The Krishna River is
polluted due to discharge of industrial effluents, sewage runoff from the
villages and cities which are situated on either sides
of the river. Furthermore,
unscientific practices such as dynamite fishing for collection of food fishes
and sand mining are alarmingly increasing along the Krishna River system. If the present trend continues, the
adverse conditions might lead to the loss of the fish fauna in the Krishna
River system. Since the catfish
form commercially important food fish and also our results suggest that the Krishna
River is a more suitable habitat for the conservation of freshwater catfishes,
there is a need to take up conservation measures in order to increase the fish
population of the Krishna River system.
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