The karyomorphological study of two species of Mahseer belonging to the genus Neolissochilus, namely Neolissochilus hexagonolepis and N. hexastichus were carried out. The study revealed the basic chromosome number in both the Masheer species was observed to be 100. However, the karyotype formula number varied among the species. N. hexagonolepis had a diploid chromosome number of 42 metacentric (m), 20 submetacentric (sm), 8 subtelocentric (st) and 30 telocentric (t) and N. hexastichus had a karyotypic formula of 32 metacentric (m), 22 submetacentric (sm), 4 subtelocentric (st) and 42 telocentric (t). This finding removed taxonomic confusion due to the differences in the chromosome number, the morphology of the chromosomes and chromosome formula between the two fish species of the genus and helped in distinctive and unblemished identification of the two species belonging to the genus Neolissochilus from Meghalaya, though they have a morphological similarity.
Mahseer, Neolissochilus hexagonolepis, Neolissochilus hexastichus, Karyotype, Taxonomic
Cavalcanti, M. J., Montelso, L. R. and Lopes, P. R. D. (1999). Landmark based Morphometric analysis in selected species of serranid fishes (Perciformes: Teleostei). Zoological Studies, 38 (3), 287-84.
Day, F. (1876). On some of the fishes of the Deccan. Zoological Journal of the Linean Society, 12, 565-578.
Day, F. (1878). The Fishes of India, London, 556-582.
Desai, V. R. (2003). Synopsis of biological data on the Tor mahseer, Tor tor (Hamilton, 1822). FAO Fisheries Synopsis, 158.
Ganai, F. A. and Yousuf, A. R. (2011). A karyological analysis of Puntius conchonius (Hamilton, 1822) (Pisces, Cyprinidae), a new cytotype from Dal Lake Srinagar Kashmir, J and K, India. Int. J. Fish. Aquat. 3, 213-217.
IUCN: International Union for Conservation of Nature. Retrieved from https://www.iucnredlist.org, accessed February 2021.
Joshi, K. D., Das, S. C. S., Pathak, R. K., Khan, A., Sarkar, U. K and Roy, K. (2018). Pattern of reproductive biology of the endangered golden mahseer Tor putitora (Hamilton, 1822) with special reference to regional climate change implications on breeding phenology from lesser Himalayan region, India. Journal of Applied Animal Research, 46 (1),1289-1295.
Kottelat, M. (2013). The fishes of the inland waters of Southeast Asia: a catalogue and core bibliography of the fishes known to occur in freshwaters, mangroves and estuaries. The Raffles Bulletin of Zoology, 27, 1-663.
Laskar, B. A. (2013). Threat Identification and Population Assessment of Neolissochilus Hexastichus- An Endemic Mahseer Fish in North-East India Vis-À-Vis Conservation Actions., 2nd RSG Final Technical Report.
Levan, A., Fredga, K. and Sandberg, A. A. (1964). Nomenclature of centeromeric positions on chromosomes. Heriditas, 52, p. 201-220.
Mani, I., Kumar, R., Kushwaha, B., Singh, M., Nagpure, N. S., Srivastava, P. K. and Lakra, W. S. (2010). Cytogenetic characterization of an endemic mahseer, Tor mohal mohanadicus (David, 1953; Teleostei: Cyprinidae). Nucleus, 53, 109-114.
Mani, I., Kumar, R., Singh, M., Kushwaha, B., Nagpure, N. S., Srivastava, P. K. and Lakra, W. S. (2013). Chromosomal distribution of constitutive heterochromatin in eight species of mahseers (Family: Cyprinidae) from India. Indian J. Biotechnol. 12, 178-186.
Manna, G. K. (1983). Cytogenetic studies on ?shes and amphibia. In: Genetical Research in India. XVth Int. Cong. Genet. Publication and Information Division, ICAR, New Delhi, 242–273.
Manna, G. K. (1984). Progress in fish cytogenetics. Nucleus, 27, 203-231
Menon, A. G. K. (1974). A check-list of Fishes of the Himalayan and the Indo-Gangetic Plains. J. Indl. Fish. Soc. India, spl. Pub, 1, 45-47.
Phillips, R. B., Pleyte, K. A. and Ihseen, P. E. (1989). Patterns of chromosomal nucleolar organizer region (NOR) variation in fishes of the Genus Salvelinus. Copeia, 1, 47-53.
Rainboth, W. J. (1885). Neolissochilus, a new genus of South Asian cyprinid fishes. Beaufortia, 35, 25-35.
Rishi, K. K. (1989) Current status of fish cytogenetics. In: Fish Genetics in India. (eds. Das, P and Jhingran, V.G). Today and Tomorrows Printers and Publishers, New Delhi, 1-20.
Roberts, T. R. (1999). Fishes of the cyprinid genus Tor in the Nam Theun watershed (Mekong basin) of Laos, with decription of a new species. The Raffles Bulletin of Zoology, 47, p. 225-236.
Sahoo, P. K., Nanda, P. and Barat, A. (2007). Karyotypic Analysis of Neolissocheilus hexagonolepis (McClelland), Puntius ticto (Ham.) and P. chola (Ham.) (Family: Cyprinidae, Pisces). Cytologia, 72, 409–413.
Sarma, D. and Bhuyan, R. N. (2007). Chocolate Mahseer (Neolissochilus hexagonolepis) Icon of Meghalaya Rivers. Fishing Chimes, 26, 116-117.
Saxena, A. and Vasave, S. (2012). Diversity of Fish chromosomes. Aquafind, Aqua fish database est. 1991.
Sen, T.K. and Jayaram, K.C. (1982). The Mahseer fish of India-a review. Rec. Zoological Survey of India. Misc. Publ. Occassional paper, 39, 38.
Suleyman, G., Ahmet, C., Ilhan, S. and Bertal, K. (2004). Karyotype analysis in Alburnus heckeli (Battalgil, 1943) from Lake Hazer. Turk. J. Vet. Anim. Sci., 28, 309-314.
Vecchione, M. and Collette, B. B. (1996). The central role of systematics in marine biodiversity issues. Oceanography, 9, p. 44–49.
Vecchione, M., Mickevich, M. F., Fauchald, K., Collette, B. B., Williams, A. B., Munroe, T. A. and Young, R. E. (2000). Importance of assessing taxonomic adequacy in determining ?shing e?ects on marine biodiversity. ICES J. Mar. Sci., 57, 677–681.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) © Author (s)