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Article

Evaluation of Well-Being Status of Near-Threatened Gangetic Leaf Fish Nandus nandus (Hamilton, 1822) in the Kawadighi Haor: Implications to Haor Fishery Management in the Northeastern Bangladesh

by
Md. Abu Kawsar
1,*,
Mohammad Amzad Hossain
2,
Debasish Pandit
3,4,
Muhammad Anamul Kabir
1 and
Md. Tariqul Alam
1,*
1
Department of Aquaculture, Sylhet Agricultural University, Sylhet 3100, Bangladesh
2
Department of Fish Biology and Genetics, Sylhet Agricultural University, Sylhet 3100, Bangladesh
3
Department of Aquatic Resource Management, Sylhet Agricultural University, Sylhet 3100, Bangladesh
4
Department of Oceanography, Khulna Agricultural University, Khulna 9100, Bangladesh
*
Authors to whom correspondence should be addressed.
Conservation 2023, 3(1), 175-190; https://doi.org/10.3390/conservation3010013
Submission received: 21 December 2022 / Revised: 9 February 2023 / Accepted: 16 February 2023 / Published: 1 March 2023
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Abstract

This study evaluated the status of the well-being of wild Nandus nandus in the Kawadighi Haor through morphometric and gastrointestinal indices and local people’s perceptions. Basic macroscopic morphology of the gastrointestinal tract (GIT), the viscera somatic index (VSI), the hepatosomatic index (HSI), the condition factor (K), length–weight relationships, and gut histology were analyzed from the regular commercial catch. The GIT morphology includes a tube-like esophagus, a tapering stomach, a tubular intestinal region, and a rectum, all of which have clinically normal shapes and conditions. VSI and HSI values fluctuate throughout the year, indicating the periodic variation of food content and availability in the ecosystem. The condition factor (K) was generally stable, with minor deviations in December. The mucosa, submucosa, muscularis, and serosa were identified from the stomach of N. nandus and showed normal histological characteristics. There were numerous proliferated villi in the tunica mucosa, but no histopathological abnormalities were found in the gut. These findings suggest that the current population of N. nandus in the Haor is in a favorable condition. However, local people reported some potential threats that might be a concern for the long-term survival of this species. The results of the present study will be useful for effective and sustainable stock management of the N. nandus fishery in the Kawadighi Haor and other floodplain ecosystems.
Keywords: Nandus nandus; gut histology; Kawadighi Haor; morphology; management Nandus nandus; gut histology; Kawadighi Haor; morphology; management

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MDPI and ACS Style

Kawsar, M.A.; Hossain, M.A.; Pandit, D.; Kabir, M.A.; Alam, M.T. Evaluation of Well-Being Status of Near-Threatened Gangetic Leaf Fish Nandus nandus (Hamilton, 1822) in the Kawadighi Haor: Implications to Haor Fishery Management in the Northeastern Bangladesh. Conservation 2023, 3, 175-190. https://doi.org/10.3390/conservation3010013

AMA Style

Kawsar MA, Hossain MA, Pandit D, Kabir MA, Alam MT. Evaluation of Well-Being Status of Near-Threatened Gangetic Leaf Fish Nandus nandus (Hamilton, 1822) in the Kawadighi Haor: Implications to Haor Fishery Management in the Northeastern Bangladesh. Conservation. 2023; 3(1):175-190. https://doi.org/10.3390/conservation3010013

Chicago/Turabian Style

Kawsar, Md. Abu, Mohammad Amzad Hossain, Debasish Pandit, Muhammad Anamul Kabir, and Md. Tariqul Alam. 2023. "Evaluation of Well-Being Status of Near-Threatened Gangetic Leaf Fish Nandus nandus (Hamilton, 1822) in the Kawadighi Haor: Implications to Haor Fishery Management in the Northeastern Bangladesh" Conservation 3, no. 1: 175-190. https://doi.org/10.3390/conservation3010013

APA Style

Kawsar, M. A., Hossain, M. A., Pandit, D., Kabir, M. A., & Alam, M. T. (2023). Evaluation of Well-Being Status of Near-Threatened Gangetic Leaf Fish Nandus nandus (Hamilton, 1822) in the Kawadighi Haor: Implications to Haor Fishery Management in the Northeastern Bangladesh. Conservation, 3(1), 175-190. https://doi.org/10.3390/conservation3010013

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