A New Record of the Pseudolaguvia nubila ( Siluriformes : Erethistidae ) from Baandhkhola ( Stream ) in Central Nepal

In this study, we describe a miniature sisorid catfish of the family Erethistidae, as a new distributional record of Pseudolaguvia nubila from the Baandhkhola (stream), a tributary of Narayani River inCentral Nepal. Pseudolaguvia nubila shows its distribution to Nepal is distinguished from its congeners by combination of characters, such astwo broad and distinct yellowish vertical bands at the origin of dorsal fin and anal fin, smooth outer edge of the dorsal fin spine, dorsal fin spine length 13.2317.60 % SL, pectoral fin length 24.89-26.27 % SL, pectoral fin spine length 18.39-19.48 % SL and body depth at anus 17.2218.69 % SL.

Until now from Nepal, Pseudolaguvia assula from Reu River near confluence with Rapti River, central Nepal (Ng and Conway, 2013) is reported including Pseudolaguvia ribeiroi and Pseudolaguvia kapuri which were also listed earlier (Shrestha, 2008;Rajbanshi, 2012).During current study we provide new records for 1 species of the genus Pseudolaguvia captured during ichthyological explorations in Nepal that are not included in the previous compilations of the fishes known to occur in the country.Therefore, the aim of the present work is to contribute in discovery of additional fish species record from the Baandhkhola, a tributary of Narayani River in Nepal.

Materials and Methods
Measurements were made point to point with digital calipers and measurements were made on the left side of specimens whenever possible and measurements following Ng and Kottelat, (2013) and Ng et al., (2013).Subunits of the head are presented as proportions of head length (HL).
Head length and measurements of body parts are given as proportions of standard length (SL).Captured fish samples were preserved in 5% formalin solution.Voucher specimens examined in this study are deposited in the Fisheries Research Division Fish Museum (FRDFM) Kathmandu, Nepal [FRDFM 5 (ex 1) and CAR 2(ex 2)] Physico-chemical parameters; temperature ( o C), pH, dissolved oxygen (mg/l), conductivity (ms) and TDS (ppt) were taken.GPS co-ordinates and altitudes were taken using GPS recorder (Model Oregon).

Distribution and Habitat
Psudolaguvia nubila (new record) were collected from Central Nepal, from Baandhkhola = stream, a tributary of Narayani River confluences with Ganges River (Fig. 3).The type locality was a shallow stream with low flow running, clear water.River width and depth were 15 m and 0.3048 m (30.48 cm) respectively and the substrate was observed to have pebbles, sand, small boulders and logs.Some aquatic vegetation such as water hyacinth, and submerged plants were observed.During fish collection at site, air temperature was 26ºC, water temperature 23ºC, pH 7.1, dissolved oxygen 7.4 mg/l, conductivity 0.01ms and total dissolved solids 0.2 ppt as well as weather was shiny.Fish species collected from this area are; Barilius vagra, Osteobrama cotio cotio, Chagunius chagunio, Puntius conchonius, Puntius sophore, Garra mullya, Mystus bleekeri, Macrognathus pancalus, Mastacembelus armatus and Pseudolaguvia nubila (new record for Nepal).

Discussion
Pseudolaguvia nubila was originally described from Sala River, a tributary of the Kaladan River, Mizoram from north eastearn India (Ng et al., 2013) and there was no record since its description from the type locality.Senior author collected specimen from Baandh stream, a tributary of Narayani River from Nepal.Pseudolaguvia nubila from Nepal showed almost similar characters with the original description except having 6 serrations on anterior edge of the pectoral spine (vs.7-8 serrations).In original description, diagnosis was mainly based on a mottled brown body with yellowish bands, feebly projecting snout, absence of Y-shaped pale marking on head, smooth edge of anterior spine of dorsal fin and combination of morphometric measurements and above mentioned characters has almost all similarity with specimens (n=3) from Nepal.The Pseudolaguvia community is apparently entirely unique and it seems to have more species representation to this point there is practically no information available on the biology of any Pseudolaguvia species.