Establishment and impact of exotic Cyprinus carpio (Common Carp) on native fish diversity in Buxar stretch of River Ganga, India

Authors

  • Archisman Ray ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Canciyal Johnson ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Ranjan Kumar Manna ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Raju Baitha ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Subhadeep Das Gupta ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Nitish Kumar Tiwari ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Himanshu Sekhar Swain ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India
  • Basanta Kumar Das ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata- 700 120, India

Keywords:

fish biodiversity, riverine health, invasive fish

Abstract

The catch pattern of the exotic Common Carp (Cyprinus carpio) and their relationship with water quality along with maturity status of fishes were assessed during 2017-2019 to understand overall establishment and impact of the species in Buxar stretch of River Ganga in West Bihar, India. A total of 64 fish species were recorded including two exotic fishes (C. carpio and Oreochromis niloticus) from the river stretch during the study period. The annual production data depicted Cyprinus carpio to be the most dominating fish species encountered from the study area sharing 57.07% (by weight) during the period 2017-19. Calculated average ‘Invasion coefficient index (Ix)’of 0.25 in entire three-year study period revealed that the invasion has moderately impacted the indigenous fish diversity. Landing of Indian Major Carp (IMC) indicated severe decline (76.4 - 95.6%) in comparison to the catch data recorded earlier from Buxar. Data generated on sex structure of Common Carp indicated that the overall sex ratio showed positive recruitment within the smaller size range of 282-307 mm and thus avails a competitive breeding advantage over other carp fishes. Gut content of Common Carp from the stretch observed major share of phytoplankton (81.04%) and zooplankton (17.18%) and thus there are significant dietary overlap of Common Carp with other valuable species. The stretch has been impacted with anthropogenic loading as identified through significantly higher water specific conductivity (580 µScm-1), Biochemical Oxygen Demand (3 mgl-1), etc. in drastically reduced water discharge regime. Among different water parameters, river flow, Biochemical Oxygen Demand and Total Phosphate showed positive whereas specific conductivity showed negative correlation with Common Carp seasonal abundance. Future conservation management measures may be formulated keeping in view of the identified factors through the present study for reducing the impending risks of the invasive fish species in Buxar stretch of River Ganga.

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Published

2021-04-01