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

Mishra, Pravakar; Naik, Subhas V.; Babu, P.V. Raghunadh; Pradhan, Umakanta; Begum, Mehmuna; Kaviarasan, Thanamegam; Vashi, Athan; Bandyopadhyay, Debkumar; Ezhilarasan, P.; Panda, Uma Sankar; Murthy, M.V. Ramana

doi:10.1016/j.oceano.2021.11.003

Cited by 26 publications

(11 citation statements)

References 16 publications

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“…Physicochemical and biological parameters will reveal the pollution status of the lake based on their concentrations. According to the previous studies, pH [ 16 ], temperature changes [ 17 ], dissolved oxygen [ 18 ], fertilizers [ 19 ], salinity [ 20 ], ammonia [ 21 ], algae [ 22 ], phosphates [ 23 ], drought conditions, and overcrowded fish populations are the major reasons for fish death in aquatic ecosystems. So the parameters mentioned in Table 1 were analyzed in the laboratory, and a minimum of 18 parameters are needed to calculate the water quality index [ 4 ].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Pollution Status and Detection of the Reason for the Death of Fish in Chamo Lake, Ethiopia

Reddythota

Timotewos

2022

Journal of Environmental and Public Health

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Chamo Lake is the third largest rift valley lake and one of the major economic sources for the communities in the Southern region, Ethiopia. The lake’s quality is deteriorating due to the untreated wastewater, and sediment inflow resulting in the death of fish was observed during the dry season. The research aims to determine the water quality status using water quality indices, in addition to identifying the reason for the death of fish in the dry season in Chamo Lake. The water samples were drawn from 5 sampling points by composite sampling method during the dry and wet seasons of the year, and we analyzed 22 water quality parameters. Ammonia (14–23.6 mg/l), phosphates (0.30–1.10 mg/l), BOD (25.32–60 mg/l), COD (40–160 mg/l), and chlorophyll (19.64–31.87 μg/L) concentrations were above the permissible limits, and DO (5.20–6.70 mg/l) was below the acceptable limit in the lake as per EPA standards concerning temperature. The values of both the water quality indices of CCMEWQI (13.90–18.40) and NSFWQI (38.59–49.63) indicated that the water quality was “poor” and “bad,” respectively. The death of fish might be due to high concentrations of ammonia and nutrients in the dry season.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Pollution Status and Detection of the Reason for the Death of Fish in Chamo Lake, Ethiopia

Reddythota

Timotewos

2022

Journal of Environmental and Public Health

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Section: Discussionmentioning

confidence: 99%

“…Mechanistically, two potential scenarios can be considered to explain the eutrophication effects on fishes. As a direct effect, oxygen depletion (mainly at the bottom) poses a strong stress on fish physiology (see Mishra et al, 2022 for a dramatic example), with hypoxia affecting feeding habits, and subsequent loss of energy reserve or muscle mass, i.e. decrease in growth and body condition (Cottingham et al, 2018; Abdel‐Tawwab et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Fish morphological and parasitological traits as ecological indicators of habitat quality in a Mediterranean coastal lagoon

Almeida,

Cruz,

Llinares

et al. 2023

Aquatic Conservation

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Coastal lagoons are key ‘transitional’ aquatic environments for biodiversity conservation. Ecological indicators are useful tools for the management of water resources in the European Union. Among different biological communities, fish are a very sensitive tool to assess environmental integrity. Indeed, their parasites can be used as complementary indicators of habitat quality. Yet there is still a deep lack of information on ecological assessment using fish (along with their parasites) for coastal lagoons, particularly for the Iberian Peninsula. The aim of the present study was to assess the use of fish morphology and their parasite communities as ecological indicators of anthropogenic impact within the Mar Menor coastal lagoon (SE Spain), a Mediterranean area of special conservation concern for European/Iberian biodiversity. Fish samples (black‐striped pipefish Syngnathus abaster and marbled goby Pomatoschistus marmoratus) were collected in August 2022 from the Littoral (high level of nutrient enrichment) and Barrier habitats. Physical status (both external and internal indices), asymmetry (level of developmental instability), parasite load, diversity and life‐cycle complexity were compared between habitat types. Body condition and mainly the health assessment index were better in the Barrier habitat. Except for pectoral fins in pipefish, the fluctuating asymmetry was statistically greater in the Littoral habitat (i.e. with eutrophication leading to poorer fish development). The parasite load was higher in the Littoral habitat for both host fish species. However, the diversity and life‐cycle complexity of parasite communities were statistically lower in the Barrier habitat (a structurally simpler environment) only for gobies. This study demonstrates an elevated potential for certain fish morphological and parasitological traits to be considered as good ecological indicators of environmental health. This could help environmental managers and policy makers to design effective monitoring programmes to detect impacts within valuable areas for conservation, such as the Mar Menor coastal lagoon.

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“…65 Algal blooms can release toxins, harming aquatic and coastal ecosystems, damaging fisheries and compromising human health and welfare. 66,67 Eutrophication poses a severe environmental and socio-economic threat, with economic losses ranging from 5.5 to 265 million euros per algal bloom. 68 For these reasons, algal bloom management is fundamental.…”

Section: Using Algae As a Metal Sorbentmentioning

confidence: 99%

Metal biosorption onto non-living algae: a critical review on metal recovery from wastewater

2023

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

Cited by 26 publications

References 16 publications

Evaluation of Pollution Status and Detection of the Reason for the Death of Fish in Chamo Lake, Ethiopia

Evaluation of Pollution Status and Detection of the Reason for the Death of Fish in Chamo Lake, Ethiopia

Fish morphological and parasitological traits as ecological indicators of habitat quality in a Mediterranean coastal lagoon

Metal biosorption onto non-living algae: a critical review on metal recovery from wastewater

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