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Check List 8(6): 1163–1165, 2012 © 2012 Check List and Authors Chec List ISSN 1809-127X (Available at Journal of Species Lists and Distribution

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Check List 8(6): 1163–1165, 2012 © 2012 Check List and Authors Chec List ISSN 1809-127X (Available at Journal of Species Lists and Distribution Check List 8(6): 1163–1165, 2012 © 2012 Check List and Authors Chec List ISSN 1809-127X (available at www.checklist.org.br) Journal of species lists and distribution Ichthyofaunal Diversity of Dhansiri River, Dimapur, PECIES S Nagaland, India OF Biswajit Kumar Acharjee 1*, Madhurima Das 2 ISTS L 3 4 1 Faculty, Kendriya Vidyalaya, Dimapur, Nagaland, India. , Papari Borah and Jayaditya Purkayastha 2 Faculty, Department of Biotechnology, AIMT, Guwahati, Assam, India. 3 Research Scholar, Department of [email protected] Zoology, Gauhati University,Assam, India. 4 Help Earth, Guwahati, Assam, India. * Corresponding author. E- mail: Abstract: Northeastern India, one of the Ichthyofaunal hot spot areas of our country, is marked by the presence of varied freshwater fishes,a few adapted to torrential waterflow. River Dhansiri is an important river of Dimapur District of Nagaland, India, which flows through Nagaland –Assam border harbouring rich aquatic flora and fauna. Very little studies have been carried out to document the fish biodiversity of the Dhansiri river till date. In the present study an attempt has been made common.to access the piscine diversity of this river. The survey results in finding of species of 34 fishes belonging to five (5) orders, thirteen (13) families and twenty four (24) genera. Cyprniformes is the dominant order while Osteoglossiformes is the least Introduction reported from Nagaland (Ao et al. 1988). Recent literature The Northeastern region of India is considered to review describes redescription and study of Amblyceps apangi from Mokokchung (Vishwanath and Linthoingambi, et 2007) and Wokha Disrtict ( Humtsoe and Bordoloi 2009) al.be 2010).one of Athe great hotspots number of freshwaterof species havefish biodiversitybeen reported in respectively. fromthe world most of(Kottelat the northeastern and Whitten, states. 1996; However, Ramanujam a very less Although Dhansiri river is the major river of Dimapur district but review of literature reveals very scarce study a small northeastern state in India, lies between the on piscine biodiversity. Earlier report presence of only parallelsnumber of of fishes 98 degree were reportedand 96 degree from Nagaland.East Longitude Nagaland, and river Brahmaputra (Karmakar and Das 2006). Thus, the This state is marked by inaccessible forested hills and nine species of fishes from this major tributary of the 26.6 degree and 27.4 degree latitude north of the Equator. particular stretch of the Dhansiri river of Dimapur district of Dikhu, Doyang, Jhanji and Dhansiri. Nagaland,present survey India. is carried out to access the fish diversity in a mountainsDimapur crisscrossed is located within the four western major riversmost namely-part of Nagaland and is surrounded by the district of Kohima in Materials and Methods Thethe south-easternboundary on thepart, eastern district part of ofKarbi Dimapur Anglong is formed in the The fish -survey and collections in Dhansiri River was bywest, Dhansiri and Golaghat River, whiledistrict the of westernAssam in part the northernof the district part. done in Rangapahar- Dimapur border ( 5 GPS points of the consists mostly of forests and hills. study sites are 25°52’35.68” N, 93°41’44.3” E; 25°52’39.65” Dhansiri is the main river of of Assam E.N, Dhansiri93°41’44.89” river, havingE; 25°52’38.79” total catchment N, 93°41’42.73” area 1220 kmE; and the Dimapur District of Nagaland. It originates from (Choudhury25°52’37.07” 2009), N, 93°41’43.98” has varied E; water 25°52’60” level thatN, 93°41’44.57” depends on Laisang peak of Nagaland Golaghat District the season. km from south to north before joining the Brahmaputra Fishes were collected with the help of cast nets from on its south bank. It flows through a distance of 352 July 2011 to February 2012. Local people were involved in netting and collection. Five sample sites were chosen in very rich in wildlife.While On oneflowing side as is thethe boundaryDhansiri Reserved between the survey area based on habitat types, water quality and Karbi Anglong and Nagaland, it flanks large wilderness depth. The specimens were photographed with Cannon 2009). The Dhansiri river is the largest tributary of river . All the essential data like place of Brahmaputra.Forest and on theIt is other a perennial Intanki source National of water Park (Choudhuryfor Dimapur district ( werepowershot recorded. 480 ). collection,The collected number specimens of fish, body were colour, transported body markings to biology etc. 25°54’45” N, 93°44’30” E and 25°91’25” N, laboratory cum museum of the Kendriya Vidyalaya 93°74’16” E Earlier studies report 230 fish species, belonging to 103 genera and 36 families from the northeastern India (Sinha andDimapur Jingran and (1991), assigned Jayaram Specimen (1999), key Barman numbers. (2002), The 1994). The current updated record shows the diversity as specimens were identified following Sen (1985), Talwar 267 species belonging to 114 genera under 38 families and formaldehyde (Ramanujam 2010). 10 orders (Ramanujum 2010). Nearly 149 different species Vishwanath (2002) before preserving them in 5% of fishes belonging to 22 different families have been 1163 Acharjee et al. | Ichthyofaunal diversity of Dhansiri River, India Results and Discussion as these are placed in endangered and near threatened check list shows Amblyceps apangi and Ompok pabda as The details of fish species recorded from the present leastcategory concerned in IUCN species (2011) but checkreview list.of literatureAlthough reveals IUCN study site are given in Table 1.The fish nomenclature is based on Fishbase.org and fish status was checked in IUCN Puntius chola, Puntius duringred list the(IUCN samples 2011). collection The status time of thebut fishes the status are based of some on conchonius,that these areAilia threatened coilia, Catla species(Sarkar catla, Mystus andvittatus Ponniah and ofthe the IUCN species (2011) mentioned data base may as it havewas prevalent got changed and infollowed recent Clarias2006; Tesiabatrachus and areBordoloi prominent 2012). vulnerable species (Molur times. and Walker 1998). Botia dario and colisa fasciatus are the The present survey of river Dhansiri in the Dimapur prominent ornamentalLabeo rohita, fishes Catla in catla the finding. and Cirrhinus mrigala town reveals the presence of thirty four (34) species of wereSome found economically in much abundance important whereas Indian few speciesmajor ofcarp hill catchfishes list belonging with seventeen to five (5) species orders, followed thirteen by (13)eight families species fingerlings of and twenty four (24) genera. Cypriniformes dominates the represented by four species each whereas one species adapted fishes were found during net trapping. wasof Siluriformes. represented Perciformes by Osteoglossiformes. and Synbranchiformes Dhansiri wereriver Setting of small scale factories near the river bank and has freshwater, semi torrent, hill stream and ornamental thatflow pesticidesof effluents (especially into the stream organphosphates) is one of the aremajor randomly factors that may affect the present fish diversity. Survey reveals Brahmaputra and Mora Dhansiri while coming through hillyfish speciesterrain. as it camouflaged with freshwater river like used in the bank side paddy fields which can also affect regionthe fish due population. to destruction Reports of thesuggest habitat, a drastic overexploitation reduction and near threatened species (Tor sp.) which is one of the andin abundance other anthropogenic of the freshwater effects fishes (Kottelat in the northeasternand Whitten Present surveys record the presenceTor of one endangered 2006). importantTable 1. findings. Presence of species is significant List of fish species in Dhansiri river, Dimapur, Nagaland. CONSERVATION STATUS SPECIMEN KEY SL NO. LIST OF FISHES ORDER FAMILY (IUCN 2011) NUMBER 1 Labeo rohita (Hamilton, 1822) Cypriniformes Cyprinidae Least concern 2 Labeo bata (Hamilton, 1822) Cypriniformes Cyprinidae Least concern KVF 134 Labeo gonius (Hamilton, 1822) Cypriniformes Cyprinidae Least concern KVF 137 Cyprinus carpio Cypriniformes Cyprinidae Not accessed 3 KVF 139 Catla catla (Hamilton, 1822) Cypriniformes Cyprinidae Not accessed 4 (Linnaeus, 1758) KVF 334 6 Ctenopharyngodon idella Cypriniformes Cyprinidae Not accessed 5 KVF 339 7 Cirrhinus mrigala (Hamilton, 1822) Cypriniformes Cyprinidae Least concern (Valenciennes, 1844) KVF 357 8 Puntius chola (Hamilton, 1822) Cypriniformes Cyprinidae Least concern KVF 358 9 Puntius sophore (Hamilton, 1822) Cypriniformes Cyprinidae Not accessed KVF 401(A) 10 Puntius conchonius (Hamilton, 1822) Cypriniformes Cyprinidae Least concern KVF 401(B) 11 Puntius ticto (Hamilton, 1822) Cypriniformes Cyprinidae Least concern KVF 401(C) 12 Tor putitora (Hamilton, 1822) Cypriniformes Cyprinidae Endangered KVF 401(D) Tor tor (Hamilton, 1822) Cypriniformes Cyprinidae Near threatened KVF 402 Garra gotyla gotyla Cypriniformes Cyprinidae Least concern 13 KVF 402 (1) Barilius barna (Hamilton, 1822) Cypriniformes Cyprinidae Least concern 14 (Gray,1830) KVF 403 16 Botia dario (Hamilton, 1822) Cypriniformes Cobitidae Least concern 15 KVF 404 17 Amblypharyngodon mola (Hamilton, 1822) Cypriniformes Cyprinidae Least concern KVF 405 18 Mystus tengra (Hamilton, 1822) Bagridae Not accessed KVF 406 19 Mystus cavasius (Hamilton, 1822) Bagridae Least concern Siluriformes KVF 407 (A) 20 Mystus vittatus Bagridae Least concern Siluriformes KVF 407 (B) 21 Wallago atu Not accessed (Bloch,1794) Siluriformes KVF 407 (C) 22 Amblyceps apangi Nath
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