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Adaptive Modifications in Four Fish Species of the Genus Garra (Teleostei; Cyprinidae) in Basistha River, Assam, India

Part of: Micrographia Collection

Published online by Cambridge University Press:  28 June 2018

Jafrin F. Hussain  and
Sabitry Bordoloi
Jafrin F. Hussain*
Affiliation:
Biodiversity Laboratory, Resource Management and Environment Section, Life Sciences Division, IASST, Vigyan Path, Paschim Boragaon, Garchuk, Guwahati 781035, Kamrup, Assam,India
Sabitry Bordoloi
Affiliation:
Biodiversity Laboratory, Resource Management and Environment Section, Life Sciences Division, IASST, Vigyan Path, Paschim Boragaon, Garchuk, Guwahati 781035, Kamrup, Assam,India
*
*Authors for correspondence: Jafrin F. Hussain, E-mail: [email protected]
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Abstract

This paper deals with the study of the surface morphology of barbels, upper lips, and adhesive discs in four hill stream fish species collected from Basistha River, a torrential river in Guwahati city, Assam, India. The four species belonging to the genus Garra namely, Garra gotyla (Gray, 1830), Garra gravelyi (Annandale, 1919), Garra stenorhynchus (Jerdon, 1849), and Garra nasuta (McClelland, 1838) were collected from the same torrential habitat. These fish revealed anatomical peculiarities in their barbels, lips, and adhesive discs which are believed to help them in adapting to such habitats. Organs exhibiting adaptive modifications (barbels, lips, and adhesive discs) were studied with the scanning electron microscope. The study primarily revealed the presence of type I and type II taste buds in the barbels, lips, and adhesive discs, and numerous unculi surrounded by microridges in the upper lips and adhesive discs. A cumulative, intercalated action of these organs enables these fish to adhere and adapt to rocky, torrential streams. Special ability to adapt to these habitats was reflected from the two types of taste buds (I and II) present in the barbels, and the clustering of excrescencies bearing unculi in the lips and adhesive discs of the fish.

Keywords

Garrahill streamadaptive modificationsadhesive discs, unculitaste buds
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 24 , Issue 3 , June 2018 , pp. 310 - 317
Copyright
© Microscopy Society of America 2018 

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Footnotes

Cite this article:Hussain JF, Bordoloi S (2018) Adaptive Modifications in Four Fish Species of the Genus Garra (Teleostei; Cyprinidae) in Basistha River, Assam, India. Microsc Microanal24(3): 310–317. doi: 10.1017/S1431927618000405

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