Algal bloom, hypoxia, and mass fish kill events in the backwaters of Puducherry, Southeast coast of India

• Autorzy: Mishra Pravakar , Naik Subrat , Babu P. Vipin , Pradhan Umakanta , Begum Mehmuna , Kaviarasan Thanamegam , Vashi Athan , Bandyopadhyay Debasmita , Ezhilarasan Pazhaniyappan , Panda Uma Sankar , Ramana Murthy Mallavarapu Venkata

Identyfikatory

DOI

10.1016/j.oceano.2021.11.003

• Języki publikacji: EN

Abstrakty

EN

The Chunnambar backwater of Puducherry experienced changes in water quality over a period. The most significant impact was the sudden mass fish kill event coincided with the Pseudo-nitzschia bloom. On 25th September 2019, a mass fish kill event was reported, i.e. about a 0.25 metric ton (MT) floating on the water surface. On 29th September 2019, a much larger (∼1 MT) than the earlier incident had occurred. Sampling was carried out to assess the causes thereof. The results indicate that high organic matter and bacterial loads accumulated in the water and sediment due to the closure of the river mouth for an extended period. High ammonia (61.4 µM) and phosphate (6.2 µM) levels attributed to eutrophic conditions in the water column and hypoxemia due to low dissolved oxygen (1.62 mg/L at St.1 and 2.4 mg/L at St.5) and algal bloom were the proximate cause of these sudden fish kills. We recommend periodic dredging to facilitate proper water exchange between the backwater and the sea.

Słowa kluczowe

EN

algal bloom; hypoxia; fish kill; water quality; Puducherry; India

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2022
• Tom: No. 64 (2)
• Strony: 396--403
• Opis fizyczny: Bibliogr. 27 poz., fot., map., tab., wykr.

Twórcy

autor

Mishra Pravakar

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Naik Subrat

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Babu P. Vipin

• Puducherry Pollution Control Committee (PPCC), Puducherry, India

autor

Pradhan Umakanta

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Begum Mehmuna

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Kaviarasan Thanamegam

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Vashi Athan

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Bandyopadhyay Debasmita

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Ezhilarasan Pazhaniyappan

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Panda Uma Sankar

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

autor

Ramana Murthy Mallavarapu Venkata

• National Centre for Coastal Research (NCCR), Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, India

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).