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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11754
Title: Invasion and impacts of alien fish species in the Ganga River, India
Authors: Singh A.K.
Kumar D.
Srivastava S.C.
Ansari A.
Jena J.K.
Sarkar U.K.
Published in: Aquatic Ecosystem Health and Management
Abstract: In this study, we document an increasing trend of catches of alien fish species from the Ganga River system. The changing fishery during 1980 to 2011 and the fish yield rate (kg km-1) are positively correlated with an invasion coefficient index (Ixi) of alien species within the river. The reproductive propagule pressure (PPP) of alien fishes (Cyprinus carpio, Oreochromis niloticus, Aristichthys nobilis, Ctenopharyngodon idella, Hypophthalmichthys molitrix and Clarias gariepinus) was determined and found to be 19.45×106 for C. carpio, 0.33×106 for O. niloticus and 0.82×106 for A. nobilis at confluences suggesting that these alien species may be migrating into new habitats. Further, these invaded species exhibited all reproductive stages, indicating their likely establishment within the river. The trophic spectrum of alien fishes spanned all levels and the gut repetitive index (GRI) indicated that that food items in most of the fishes were similar showing early trends of food-web alteration and biotic homogenization. The results of this study suggested a continuous decline in the catch of local fishes by wet weight, particularly Indian major carps (IMC) from 128.91 kg km-1 to 38.58 kg km-1 owing to increased catches of alien species from nil to 384.27 kg km-1. Invasion of alien species in the Ganga River represented one of many possible causes of the decline in river health and overall loss of native aquatic communities. © 2013 Copyright Taylor and Francis Group, LLC.
Citation: Aquatic Ecosystem Health and Management (2013), 16(4): 408-414
URI: https://doi.org/10.1080/14634988.2013.857974
http://repository.iitr.ac.in/handle/123456789/11754
Issue Date: 2013
Keywords: aquatic biodiversity
aquatic health
risks and impacts
ISSN: 14634988
Author Scopus IDs: 55757781658
57202478211
56663620600
55388773100
6602079573
7006338864
Author Affiliations: Singh, A.K., National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India
Kumar, D., National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India
Srivastava, S.C., National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India
Ansari, A., National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India
Jena, J.K., National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India
Sarkar, U.K., National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India
Funding Details: The authors thankfully acknowledge the financial support of Uttar Pradesh State Biodiversity Board, Lucknow.
Corresponding Author: Singh, A. K.; National Bureau of Fish Genetic Resources, Canal Ring Road, P. O. Dilkusha, Telibagh, Lucknow, Uttar Pradesh, 226002, India; email: aksingh56@rediffmail.com
Appears in Collections:Journal Publications [ME]

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