Invasion of non-indigenous suckermouth armoured catfish of the genus Pterygoplichthys (Loricariidae) in the East Kolkata Wetlands: stakeholders’ perception


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Authors

  • Ajmal Hussan Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
  • J. K. Sundaray ICAR-Central Institute of Freshwater Aquaculture, Bhubaneswar, Odisha
  • R. N. Mandal Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
  • Farhana Hoque Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
  • Arabinda Das Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
  • P. P. Chakrabarti Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
  • S. Adhikari Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal

https://doi.org/10.21077/ijf.2019.66.2.86267-05

Abstract

Rapid spread and population increase of suckermouth armoured catfishes belonging to the genus Pterygoplichthys(Loricariidae) in the East Kolkata Wetlands (EKW) in recent times is of increasing concern, because of the notable possibility that these non-native catfishes are adversely affecting fish germplasm and commercial fishery of this unique ecosystem. To study the present status of these loricariids and the invasion and impact dynamics in EKW ecosystems, field survey was conducted over a water spread area of 670 ha, comprising 120 fishermen (N2 = 120) of 30 farms (N1 = 30),  between February and October, 2017 through a pre-tested, open-ended structured schedule. A total of 943 specimens of Pterygoplichthysspp. were collected and analysed for abundance, length-weight parameters, gonado-somatic index and relative fecundity.  Pterygoplichthysspp. occurred at 29 (97%) of 30 surveyed farms and approximately 70% of the farm owners perceived that these fishes posed moderate to serious economic impact. Fish production cutback, small indigenous fish (particularly,Puntius spp.) depredation and bottom structure alteration are among the major negatives perceived; a positive note in terms of soil-bound nutrient release was reported by a few fishermen (1%). Channel through which sewage water intake occurred by gravitation has been perceived to be the main route of entry (77%), with significantly higher abundance around the periphery of the pond. Almost 80% respondents perceived an increased occurrence of these fishes over the last four years, with seasonal pattern of abundance. While culling of suckermouthafter harvest was the most common method adopted to reduce population, multi-layer screening in the inlet of sewage water into pond is perceived as most sought solution for control. Average direct and indirect financial losses due to Pterygoplichthys spp. in EKW was calculated as`0.092 lakh ha-1yr-1, which points towards mounting pressure of loricariids in already dwindling economics and biodiversity of EKW.

Keywords: East Kolkata Wetlands, Biodiversity, Pterygoplichthys,Invasion, Sewage

Author Biographies

  • Ajmal Hussan, Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
    Mr. Ajmal Hussan is presently working as a Scientist at the Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture (CIFA), Rahara, Kolkata. He has a post-graduate degree in Fisheries Environment and Ecology from Karnataka Veterinary, Animal and Fisheries Sciences University, Karnataka. He has published about 14 original research articles in different international and national journals. Subjects of interest are biodiversity conservation, wastewater management and small indigenous fishes. At present working on breeding and culture catfishes (Ompok sp., Mystus sp. and Eutropiichthys vacha); impact of non-native Pterygoplichthys on Indian aquaculture and also associated with projects on Tenualosa ilisha, Jayanti Rohu and genetically improved M. rosenbergii.
  • J. K. Sundaray, ICAR-Central Institute of Freshwater Aquaculture, Bhubaneswar, Odisha
    Dr. Jitendra Kumar Sundaray is presently working as a Principal Scientist and Head, Division of Fish Genetics & Biotechnology,  ICAR-Central Institute of Freshwater Aquaculture, Bhubaneswar, Odisha. He has a Ph. D. degree in Animal & Marine Bioresources Science from Kyushu University, Fukuoka, Japan. Subjects of interest are fish genetics and Molecular Endocrinology
  • R. N. Mandal, Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal

    Dr. Rathindra Nath Mandal is presently working as a Principal Scientist at the Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture (CIFA), Rahara, Kolkata. He has a post-graduate degree in Botany from University of Calcutta, West Bengal. Subjects of interest are mangrove, aquatic weeds, live food organisms and wastewater management

  • Farhana Hoque, Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal

    Miss. Farhana Hoque is presently working as a Scientist at the Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture (CIFA), Rahara, Kolkata. She has a post-graduate degree in Fisheries Microbiology from West Bengal University of Animal and Fishery Sciences.  Received Gold Medal in B.F.Sc. and First class first in M.F. Sc. Subjects of interest are Aquatic Animal Health, Fish pathology, Microbiology, Immunology and Molecular biology

  • Arabinda Das, Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
    Mr. Arabinda Das is presently working as a Scientist at the Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture (CIFA), Rahara, Kolkata. He has a post-graduate degree in Fisheries Science from ICAR-Central Institute of Fisheries Education (CIFE), Mumbai. He has published about 16 original research articles in different international and national journals. His research interest includes fish reproductive physiology and its application in captive breeding and quality seed production of indigenous fishes. At present he is working on catfishes (Ompok sp., Mystus sp. and Eutropiichthys vacha) and also associated with other species of regional importance (Cirrhinus reba, Systomus sarana, Neolissocheilus hexagonolepis and Tenualosa ilisha) and with research needs of regional importance such as sewage fed fish farming
  • P. P. Chakrabarti, Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal

    Dr. P.P. Chakrabarti, presently engaged as Principal Scientist at the Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture (CIFA), Rahara, Kolkata. He has a Ph. D. in Agricultural Chemistry & Soil Science from Calcutta University, West Bengal. He has 28 years of research experience and handled more than 20 research projects funded by ICAR-CIFA, AP-CESS World Bank, Ministry of Environment and Forest, DBT etc. During last 15 years he has been engaged in the projects for developing seed production and culture of regionally preferred fish species like O. pabda, O. bimaculatus, M. vittatus, M. gulio etc

  • S. Adhikari, Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture, Rahara, Kolkata -700118, West Bengal
    Dr. Subhendu Adhikari is presently working as a Principal Scientist at the Regional Research Centre, ICAR-Central Institute of Freshwater Aquaculture (CIFA), Rahara, Kolkata. He has a Ph. D. in Agricultural Chemistry & Soil Science from Calcutta University, West Bengal.  Subjects of interest are management of Pond Environment (Soil and water quality management) and Nutrient Recycling in Pond Ecosystem, Assessment of heavy metals and pesticides in aquatic systems, carbon sequestration in aquaculture ponds

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Submitted

2019-01-19

Published

2019-06-30

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How to Cite

Hussan, A., Sundaray, J. K., Mandal, R. N., Hoque, F., Das, A., Chakrabarti, P. P., & Adhikari, S. (2019). Invasion of non-indigenous suckermouth armoured catfish of the genus Pterygoplichthys (Loricariidae) in the East Kolkata Wetlands: stakeholders’ perception. Indian Journal of Fisheries, 66(2). https://doi.org/10.21077/ijf.2019.66.2.86267-05