Finfish harvest trends in the Chalakudy River within the Western Ghats biodiversity hotspot in the Southwest of India: Finfish harvest trends in the Chalakudy River

Renjithkumar Chelapurath Radhakrishnan; Kuttanelloor Roshni

doi:10.5281/zenodo.13341671

Authors

Renjithkumar Chelapurath Radhakrishnan Research Department of Fisheries and Aquaculture, St. Albert’s College (Autonomous), Ernakulam, Kochi-682018, Kerala, India https://orcid.org/0000-0001-6569-5075
Kuttanelloor Roshni School of Environmental Studies, Cochin University of Science and Technology, Kochi-620222, Kerala, India https://orcid.org/0000-0002-2542-2600

DOI:

https://doi.org/10.5281/zenodo.13341671

Keywords:

Chalakudy river, Fishery, Exotic species, Gill net, catch per unit effort

Abstract

Quantifying the fish harvest from a riverine aquatic ecosystem is a major pre-requisite for fisheries management. In this direction, the present study estimated the fin fish harvest of Chalakudy River, flowing through the Western Ghat biodiversity hotspot in the Southwest coast of India from June 2019 to May 2020 covering major fish landing centres. The fishery yield from the Chalakudy River was estimated at 68.53 tonnes, comprising 68 fin fish species under 37 families and 57 genera. Family Cyprinidae dominated with 19 species, followed by Cichlidae (5 species), Channidae, and Bagridae (three species each). Cyprinids (48.42%), cichlids (14.56%), catfishes (12.66%), and murrels (8.79%) constituted the major fish groups that contributed to the fishery. The landings were represented by one critically endangered (CR) (Hypselobarbus thomassi), two endangered (EN) (Osteochilichthys longidorsalis, and Tor malabaricus) and five vulnerable (VU) (H. kolus, Hyporhamphus xanthopterus, Wallago attu, Channa diplogramma and Horabagrus brachysoma) fish species. The dominant fish species in the fishery were Cyprinus carpio (6.36 t), H. kolus (5.23 t), Barbodes carnaticus (4.85 t), Etroplus suratensis (4.07 t), and T, khudree (3.46 t). The exploited fishery comprised 15 alien species, encompassing 12 exotic species and three transplanted species from Northeast India. Gill nets (91.77%) was the most dominant gear used in the riverine fishery followed by seine nets (4.99%), hooks and lines (2.02%), cast nets (0.98%) and fish traps (0.23%). Our research reveals that the fish population in the Chalakudy river faces intense exploitation, with substantial catches of exotic fish species posing challenges to both the sustainability of the fishery and the survival of native fish. This highlights the urgency of conserving the river's unique and threatened biodiversity.

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