~ 119 ~ International Journal of Fisheries and Aquatic Studies 2022; 10(5): 119-123 E-ISSN: 2347-5129 P-ISSN: 2394-0506 (ICV-Poland) Impact Value: 76.37 (GIF) Impact Factor: 0.549 IJFAS 2022; 10(5): 119-123 © 2022 IJFAS www.fisheriesjournal.com Received: 04-07-2022 Accepted: 07-08-2022 Anand P Singh Department of Zoology, Agra College Agra, Agra, Uttar Pradesh, India Jahnavi Saxena Department of Zoology, Isabella Thoburn College, Lucknow, Uttar Pradesh, India Rajesh K Srivastava Department of Zoology, Isabella Thoburn College, Lucknow, Uttar Pradesh, India Sunil P Trivedi Department of Zoology, University of Lucknow, Lucknow, Uttar Pradesh, India Arun Ratn PG-Department of Zoology, Sanatan Dharm College, Muzaffarnagar, Uttar Pradesh, India Corresponding Author: Arun Ratn PG-Department of Zoology, Sanatan Dharm College, Muzaffarnagar, Uttar Pradesh, India Comparative analysis of morphometrics of fish species from river Ganga and Gomti of Uttar Pradesh (India) Anand P Singh, Jahnavi Saxena, Rajesh K Srivastava, Sunil P Trivedi and Arun Ratn DOI: https://doi.org/10.22271/fish.2022.v10.i5b.2735 Abstract The present study aimed to investigate the morphometric characters of fish species, Labeo rohita, Rita rita, Wallago attu and Mystus aor sampled from two aquatic habitats, Gomti River nearby Lucknow and Ganga River at Ghazipur, Uttar Pradesh, India. Both rivers are extremely cherished rivers as they are full of natural resources and highly rich in faunal and floral diversity. A total of 100 specimens of each fish species were collected during October, 2021 to January, 2022. The seventeen morphometric parameters were selected for the comparative differential analysis of population stocks of each fish species in two aquatic habitats. The quantitative measurements of all the morphometric characters delivered the important information about the growth of body parts of fishes in different aquatic ecosystem. The variations in morphometry of individuals of a species illustrated the alterations in the population status under the differential environmental circumstances. The approach of morphometric analysis can be a strategic tool to explore the body shape formation of fish species in different ecosystems. The analyzed data of morphometric dimensions of four fish species would be beneficial for the policy makers or planners to develop the scientific strategies for their protection and conservation. The findings will also set the scientific principles for the management and sustainable development of the commercially essential freshwater food fishes. Keywords: Labeo rohita, morphometric parameters, Mystus aor, population stocks, Rita rita, wallago attu Introduction The morphometric characters, utmost cost-effective keys, are pervasively used as tools to identify fish species in differential spatio-temporal environments [4, 29] . The morphological parameters illustrate the phonotypical plasticity and are influenced by the changes in the environmental factors [13] . The assessment of these growth features of fish expresses about their general health. Consequently, the dissimilarities in the measurable characters will disclose the adaptation to different conditions of the particular environment and are helpful in expounding the identity of individuals of fish [6] . So the morphological dimensions or parameters have been used in the identification and characterization of the fish species. These measurements of the body parts of fish are extensively important for the taxonomical examinations and fishery sciences [22] . The analysis of these measurements exemplifies the variations in size and shape of fish [30] . The study expresses the major keys for defining the variable systematic growth and the different parameters of fishes [32] . For the growth and identification, the morphometric characters are used as marked keys [9] . The identity of fishes may be determined by two biometric factors which are morphometric and meristic parameters. Generally, the morphometric defines the rate of fish growth and its rate is estimated by measuring the body parts of the fishes in order to decide their species and their classes [8] . India rank seventh in the list of top ten exporters of fish and fishery products and is second largest fish producing country. The Indian sector of aquaculture has enormous resources and have a greater potential to grow in future scenarios. Among commercial producing freshwater fishes, Labeo rohita is one of the major carps in India and is commonly known as rui and rohu. It belongs to order Cypriniformes and family Cyprinidae. Labeo rohita is a warm water teleost and column feeder herbivore fish showing rapid growth in terms of flesh. Labeo rohita (Rohu; Hamilton, 1822) is mainly found in the natural habitats such as streams, river, lake, canals,