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Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh

Gorai River is one of the important rivers in Bangladesh for rich aquatic biodiversity. The river is originated from the Ganges-Padma River system, a trans-boundary river between India and Bangladesh. Once the river was rich in fish biodiversity, but due to man-made and natural causes the availabili...

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Autores principales: Tikadar, Kishor Kumar, Kunda, Mrityunjoy, Mazumder, Sabuj Kanti
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8646988/
https://www.ncbi.nlm.nih.gov/pubmed/34926851
http://dx.doi.org/10.1016/j.heliyon.2021.e08478
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author Tikadar, Kishor Kumar
Kunda, Mrityunjoy
Mazumder, Sabuj Kanti
author_facet Tikadar, Kishor Kumar
Kunda, Mrityunjoy
Mazumder, Sabuj Kanti
author_sort Tikadar, Kishor Kumar
collection PubMed
description Gorai River is one of the important rivers in Bangladesh for rich aquatic biodiversity. The river is originated from the Ganges-Padma River system, a trans-boundary river between India and Bangladesh. Once the river was rich in fish biodiversity, but due to man-made and natural causes the availability of fish reduced drastically. A comprehensive analysis of fish diversity indices, gear efficiency, catch composition and decline causes of fish diversity in Gorai River, Bangladesh was accomplished. The data were collected on monthly basis from January to December 2018 from three major fishing sites of the river. A total of 62 fish and 2 prawn species under 12 orders and 24 families were recorded. Cypriniformes was the leading order consisting 27% of the total catch. The mean values of Shannon-Weaver diversity (H′), Simpson's index (1-D), Margalef's richness (d) and Pielou's evenness (J′) indices were recorded as, 1.478 ± 0.495, 0.57 ± 0.197, 15.115 ± 4.435 and 0.481 ± 0.152, respectively. At the similarity of 58.7%, two groups were attained in the cluster analysis and the Non-metric Multidimensional Scaling (nMDS) showed 40% similarity among the three sites in twelve months based on the Bray-Curtis similarity matrix. The highest and lowest CPUE were recorded from seine net (5.2 ± 1.72 kg gear(−1) haul(−1)) and hook & long lines (0.0135 ± 0.0015 kg gear(−1)haul(−1)), respectively whereas, highest and lowest gear efficiency were recorded from lift net (0.321 ± 0.036 kg gear(−1)person(−1)hour(−1)) and fish trap (0.0005 ± 0.0002 kg gear(−1)person(−1)hour(−1)), respectively. Alternatively, the highest fish catch was recorded on April (21228 ± 464.38 kg) and lowest on August (3855 ± 138.21 kg). According to the fishermen fish biodiversity of the Gorai River declined day by day due to overexploitation, destructive fishing practice, pollution, construction of obstacles for fish movement, and natural causes like siltation. Proper implementation of fish acts and regulations, use of authorized fishing gear, community-based fisheries management, sanctuary establishment and management, stocking of fish fingerling, and raising public awareness can play a great role in enhancing and conserving fish biodiversity in the Gorai River of Bangladesh.
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spelling pubmed-86469882021-12-17 Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh Tikadar, Kishor Kumar Kunda, Mrityunjoy Mazumder, Sabuj Kanti Heliyon Research Article Gorai River is one of the important rivers in Bangladesh for rich aquatic biodiversity. The river is originated from the Ganges-Padma River system, a trans-boundary river between India and Bangladesh. Once the river was rich in fish biodiversity, but due to man-made and natural causes the availability of fish reduced drastically. A comprehensive analysis of fish diversity indices, gear efficiency, catch composition and decline causes of fish diversity in Gorai River, Bangladesh was accomplished. The data were collected on monthly basis from January to December 2018 from three major fishing sites of the river. A total of 62 fish and 2 prawn species under 12 orders and 24 families were recorded. Cypriniformes was the leading order consisting 27% of the total catch. The mean values of Shannon-Weaver diversity (H′), Simpson's index (1-D), Margalef's richness (d) and Pielou's evenness (J′) indices were recorded as, 1.478 ± 0.495, 0.57 ± 0.197, 15.115 ± 4.435 and 0.481 ± 0.152, respectively. At the similarity of 58.7%, two groups were attained in the cluster analysis and the Non-metric Multidimensional Scaling (nMDS) showed 40% similarity among the three sites in twelve months based on the Bray-Curtis similarity matrix. The highest and lowest CPUE were recorded from seine net (5.2 ± 1.72 kg gear(−1) haul(−1)) and hook & long lines (0.0135 ± 0.0015 kg gear(−1)haul(−1)), respectively whereas, highest and lowest gear efficiency were recorded from lift net (0.321 ± 0.036 kg gear(−1)person(−1)hour(−1)) and fish trap (0.0005 ± 0.0002 kg gear(−1)person(−1)hour(−1)), respectively. Alternatively, the highest fish catch was recorded on April (21228 ± 464.38 kg) and lowest on August (3855 ± 138.21 kg). According to the fishermen fish biodiversity of the Gorai River declined day by day due to overexploitation, destructive fishing practice, pollution, construction of obstacles for fish movement, and natural causes like siltation. Proper implementation of fish acts and regulations, use of authorized fishing gear, community-based fisheries management, sanctuary establishment and management, stocking of fish fingerling, and raising public awareness can play a great role in enhancing and conserving fish biodiversity in the Gorai River of Bangladesh. Elsevier 2021-11-27 /pmc/articles/PMC8646988/ /pubmed/34926851 http://dx.doi.org/10.1016/j.heliyon.2021.e08478 Text en © 2021 The Author(s) https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Research Article
Tikadar, Kishor Kumar
Kunda, Mrityunjoy
Mazumder, Sabuj Kanti
Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh
title Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh
title_full Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh
title_fullStr Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh
title_full_unstemmed Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh
title_short Diversity of fishery resources and catch efficiency of fishing gears in Gorai River, Bangladesh
title_sort diversity of fishery resources and catch efficiency of fishing gears in gorai river, bangladesh
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8646988/
https://www.ncbi.nlm.nih.gov/pubmed/34926851
http://dx.doi.org/10.1016/j.heliyon.2021.e08478
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