Delineation of seven species of genus Channa from upper Assam region, India using sagittal otolith morphology

Keywords: Identification, sagittal otoliths, snakehead taxonomy, taxonomic keys, variation


Morphology of sagittal otoliths of seven species of genus Channa from upper Assam, India was studied to obtain baseline information for their prospective role in taxonomic studies. In the present study, variations were recorded in morphological characteristics of sagittal otolith among the studied species. Of all the studied parameters, otolith shape, sulcus acusticus, ostium, and cauda, in particular, were found to be taxonomically important features for the identification of the species. The pentagonal shape of sagitta in Channa punctata, pseudo-ostiocaudal sulcus acusticus in C. marulius, bent concave ostium in C. stewartii, straight cauda in C. bleheri were found to be species-specific features. Sagitta size was smallest in C. gachua while the largest was recorded in C. striata. The proposed taxonomic keys enumerated through the combination of different otolith characters from the present investigation will be useful in the identification of these species when standard methodologies fail to deliver satisfactory results.


Adamson EA, Hurwood DA, Mather PB (2010) A reappraisal of the evolution of Asian snakehead fishes (Pisces, Channidae) using molecular data from multiple genes and fossil calibration. Molecular Phylogenetics and Evolution 56(2): 707–717.

Battaglia P, Malara D, Romeo T, Andaloro F (2010) Relationships between otolith size and fish size in some mesopelagic and bathypelagic species from the Mediterranean Sea (Strait of Messina, Italy). Scientia Marina 74(3): 605–612.

Britz R (2013) Channa andrao, a new species of dwarf snakehead from West Bengal, India (Teleostei: Channidae). Zootaxa 3731(2): 287–294.

Britz R, Anoop VK, Dahanukar N, Raghavan R (2019) The subterranean Aenigmachanna gollum, a new genus and species of snakehead (Teleostei: Channidae) from Kerala, South India. Zootaxa 4603(2): 377–388.

Campana SE (1999) Chemistry and composition of fish otoliths: pathways, mechanisms and applications. Marine Ecology Progress Series 188: 263–297.

Campana SE, Casselman JM (1993) Stock discrimination using otolith shape analysis. Canadian Journal of Fisheries and Aquatic Sciences 50(5): 1062–1083.

Conte-Grand C, Britz R, Dahanukar N, Raghavan R, Pethiyagoda R, ... Ruber L (2017) Barcoding snakeheads (Teleostei, Channidae) revisited: discovering greater species diversity and resolving perpetuated taxonomic confusions. PLoS One 12(9): e0184017.

Gaemers PAM (1984) Taxonomic position of the Cichlidae (Pisces, Perciformes) as demonstrated by the morphology of their otoliths. Netherlands Journal of Zoology 34: 566–595.

Gagliano M, McCormick MI (2004) Feeding history influences otolith shape in tropical fish. Marine Ecology Progress Series 278: 291–296.

Gauldie RW (1988) Function, form and time-keeping properties of fish otoliths. Comparative Biochemistry and Physiology Part A: Physiology 91(2): 395–402.

Geetakumari K, Vishwanath W (2010) Channa melanostigma, a new species of freshwater snakehead from north-east India (Teleostei: Channidae). Journal of the Bombay Natural History Society 107(3): 231–235.

Gurumayum SD, Tamang L (2016) Channa pomanensis, a new species of snakehead (Teleostei: Channidae) from Arunachal Pradesh, northeastern India. Species 17: 175–186.

Jaramillo AM, Tombari AD, Benedito Dura V, Santamalia R, Eugenia M, Volpedo AV (2014) Otolith eco-morphological patterns of benthic fishes from the coast of Valencia (Spain). Thalassas: an International Journal of Marine Sciences 30(1): 57–66.

Knight JM (2016) Channa pardalis, a new species of snakehead (Teleostei: Channidae) from Meghalaya, northeastern India. Journal of Threatened Taxa 8(3): 8583–8589.

Kumar P, Chakraborty SK, Jaiswar AK (2012) Comparative otolith morphology of sciaenids occurring along the north-west coast of India. Indian Journal of Fisheries 59(1): 19–27.

Kumar RG, Basheer VS, Ravi C (2019) Aenigmachanna mahabali, a new species of troglophilic snakehead (Pisces: Channidae) from Kerala, India. Zootaxa 4638(3): 410–418.

Lalhlimpuia DV, Lalronunga S, Lalramliana L (2016) Channa aurantipectoralis, a new species of snakehead from Mizoram, north-eastern India (Teleostei: Channidae). Zootaxa 4147(3): 343–350.

Lalramliana L, Knight JDM, Lalhlimpuia DV, Singh M (2018) Integrative taxonomy reveals a new species of snakehead fish, Channa stiktos (Teleostei: Channidae), from Mizoram, North Eastern India. Vertebrate Zoology 68(2): 165–175.

Lombarte A, Chic O, Parisi-Baradad V, Olivella R, Piera J, Garcia-Ladona E (2006) A web-based environment for shape analysis of fish otoliths. The AFORO database. Scientia Marina 70(1): 147–152.

Lombarte A, Rucabado J, Matallanas J, Lloris D (1991) Numerical taxonomy of Nototheniidae based on the shape of the otoliths. Scientia Marina 55(2): 413–418.

Nolf D (1985) Otolithi piscium. Handbook of Paleoichthyology, Vol. 10. Gustav Fischer Verlag. Stuttgart, New York.

Platt C, Popper AN (1981) Fine structure and function of the ear. In: Tavolga WN, Popper AN, Fay RR (Eds) Hearing and Sound Communication in Fishes. Springer-Verlag, New York.

Praveenraj J, Uma A, Knight JDM, Moulitharan N, Shankar B, ... Bleher H (2018a) Channa quinquefasciata, a new species of snakehead (Teleostei: Channidae) from Torsa River, North Bengal, India. Aqua, International Journal of Ichthyology 24(4): 141–152.

Praveenraj J, Uma A, Moulitharan N, Bleher H (2018b) Channa bipuli, a new species of snakehead (Teleostei: Channidae) from Assam, Northeast India. Aqua, International Journal of Ichthyology 24(4): 153–166.

Praveenraj J, Uma A, Moulitharan N, Kannan R (2019a) Channa brunnea, a new species of snakehead (Teleostei: Channidae) from West Bengal, India. Zootaxa 4624(1): 59–70.

Praveenraj J, Uma A, Moulitharan N, Singh SG (2019b) A new species of dwarf Channa (Teleostei: Channidae) from Meghalaya, Northeast India. Copeia 107(1): 61–70.

Ruber L, Tan HH, Britz R (2020) Snakehead (Teleostei: Channidae) diversity and the Eastern Himalaya biodiversity hotspot. Journal of Zoological Systematics and Evolutionary Research 58(1): 356–386.

Smale MJ, Watson G, Hecht T (1995) Otolith atlas of southern African marine fishes. Ichthyological Monographs of the J.L.B. Smith Institute of Ichthyology 1: 1–253.

Sonowal J, Nayak N, Kachari A, Biswas SP (2018) Studies on sagittal otolith morphology and morphometric relationships of Trichogaster fasciata from the upper Brahmaputra basin, Assam. Trends in Fisheries Research 7(3): 123–128.

Stransky C, MacLellan SE (2005) Species separation and zoogeography of redfish and rockfish (genus Sebastes) by otolith shape analysis. Canadian Journal of Fisheries and Aquatic Sciences 62(10): 2265–2276.

Tuset VM, Azzurro E, Lombarte A (2011) Identification of Lessepsian fish species using the sagittal otolith. Scientia Marina 76(2): 289–299.

Tuset VM, Lombarte A, Assis CA (2008) Otolith atlas for the western Mediterranean, north and central eastern Atlantic. Scientia Marina 72(S1): 7–198.

Vishwanath W, Geetakumari K (2009) Diagnosis and interrelationships of fishes of the genus Channa Scopoli (Teleostei: Channidae) of northeastern India. Journal of Threatened Taxa 1(2): 97–105.

Volpedo AV, Echeverria DD (2000) Catalog and keys of otoliths for the identification of fish from the Argentine Sea. 1. Fishes of economic importance. Dunken, Buenos Aires.

Zorica B, Sinovcic G, Cikes KV (2010) Preliminary data on the study of otolith morphology of five pelagic fish species from the Adriatic Sea (Croatia). Acta Adriatica 51(1): 89–96.

How to Cite
Sonowal, J., Singh, M. K., & Biswas, S. P. (2020). Delineation of seven species of genus Channa from upper Assam region, India using sagittal otolith morphology. Journal of Fisheries, 8(3), 868-872. Retrieved from