Correlation Between Pollution Trends of Freshwater Bodies and Bacterial Disease of Fish Fauna

Dar, Gowhar Hamid; Bhat, Rouf Ahmad; Kamili, Azra N.; Chishti, M. Z.; Qadri, Humaira; Dar, Riyaz Ahmad; Mehmood, Mohammad Aneesul

doi:10.1007/978-981-13-8277-2_4

Cited by 16 publications

(5 citation statements)

References 48 publications

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“…Furthermore, evidence supports the confluence of multiple factors contributing to fish mortality events (Langdon et al 1985, Mancini et al 2000, Hurst 2007, Noga 2010, Falkenberg et al 2019). Environmental perturbations play a fundamental role in the appearance of diseases (Lafferty and Kuris 1999, Dar et al 2019). Indeed, various opportunistic organisms thrives amidst environmental conditions such as dry spells, overcrowding, high or low temperatures, excessive organic matter, deteriorated water quality, among others stressors.…”

Section: Introductionmentioning

confidence: 88%

Winter mortality of freshwater fish associated with parasitic infection

Hernández,

Aichino,

Santinón

et al. 2024

Rev. vet.

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This study reports an episode of fish mortality occurred in the Garupá and Pindapoy Grande streams, near the confluence with the Paraná River (Garupá, Argentina). Dead and moribund fish of various species were observed floating on the water surface. Environmental parameters measured were temperature 5 °C, water temperature 15.1 (±0.6) °C, dissolved oxygen 8.7 (±1.2) ppm, pH 7.5 (±0.2), electrical conductivity 67.6 (± 8.8) mS cm-1 and mean depth of 1.7 (±1.0) m. Macroscopic examination of moribund fish revealed corneal opacity, whitish tegument, increased gill mucus, and whitish areas on gill filaments. Microscopic analysis of gills revealed severe generalized epithelial hyperplasia, lamellar fusion, congestion, and inflammatory infiltrate, particularly lymphocytes and eosinophilic granular cells. In addition, microscopic examination allowed the identification of the following ectoparasites found in gills and tegument: Chilodonella, Ichthyophthirius, Dactylogyridae and Trichodinidae, representing 98%, 1.2%, 0.6% and 0.2%, respectively. This study constitutes a novel record of wild fish mortality associated with extreme environmental conditions and parasitosis. Furthermore, our findings are significant as there are no prior reports in Argentina of epizootic cases linked to Chilodonella sp. infection in wild or farmed fish populations, being the first report of chilodonelliasis for this region.

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Section: Introductionmentioning

confidence: 88%

Winter mortality of freshwater fish associated with parasitic infection

Hernández,

Aichino,

Santinón

et al. 2024

Rev. vet.

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“…Such inclement conditions could become more common under future climate change. The predicted increase in the average temperature in the next years is suspected to facilitate the spread of parasites (Bruneaux et al, 2017), invasive species (Bean, 2020) and increase the toxic effects of pollutants (Dar et al, 2020) with negative consequences for all life stages of Atlantic salmon and brown trout. From the perspective of research and management, it is thus particularly important to (i) understand and predict the effects of climate change on habitat suitability for both species; (ii) identify and ensure access to cold‐water refugia as a key to improving population resilience (Kuhn et al, 2021); and (iii) understand and manage the interactions with other stressors, especially those that are also temperature dependent.…”

Section: Current Status Of Threats To Salmonid Populations In Fresh Watermentioning

confidence: 99%

Environmental threats and conservation implications for Atlantic salmon and brown trout during their critical freshwater phases of spawning, egg development and juvenile emergence

Smialek

Pander

Geist

2021

Fisheries Management Eco

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Atlantic salmon Salmo salar L. and brown trout Salmo trutta fario L. are species of high socio‐economic and ecological value. Declining populations make them target species of fisheries management. This paper reviews the direct effects of deficient longitudinal connectivity, changes in discharge, high water temperatures, oxygen depletion, changes in water chemistry and increasing loads of fine sediment on the critical life stages of spawning, egg incubation and emergence. It further provides an overview about the basic autecological requirements of Atlantic salmon and brown trout and summarises important thresholds of physico‐chemical tolerances. This collection of information provides important baselines for assessing historical, ongoing and new threats relevant for the management of both species in fresh waters. Critical early‐life stages of both species are almost identical, creating synergies in conservation and restoration. Seaward‐migrating forms are exposed to further stressors, but improving starting conditions can also greatly improve their resilience.

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“…Thus, in principle, the higher epitheliocystis prevalence in pollution‐exposed rockfish and sandperch would be in line with the notion that environmental contaminants can increase the susceptibility of individuals to this infection via immune depression also in natural environments. Pollutants could have also favoured an increase in density of the pathogens, resulting in higher probability of infection (Dar et al ., 2020; Vethaak et al ., 1992). This, however, would be harder to evaluate as little is still known about how fish acquire the obligate intracellular bacteria; vertical or horizontal transmission and/or the utilization of a reservoir such as invertebrate or protist hosts have all been proposed (Katharios et al ., 2015; Qi et al ., 2018; Stride et al ., 2014).…”

Section: Figurementioning

confidence: 99%

“…Pollutants could have also favoured an increase in density of the pathogens, resulting in higher probability of infection (Dar et al, 2020;Vethaak et al, 1992). This, however, would be harder to evaluate as little is still known about how fish acquire the obligate intracellular bacteria; vertical or horizontal transmission and/or the utilization of a reservoir such as invertebrate or protist hosts have all been proposed (Katharios et al, 2015;Qi et al, 2018;.…”

mentioning

confidence: 99%

Epitheliocystis in wild marine fishes and its relation with anthropogenic pollution

Novacovsky

Palacios

Sueiro

2021

Journal of Fish Biology

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Epitheliocystis is a fish disease with recorded in increasing numbers globally. Here we show that (a) pollution‐exposed wild marine fishes have higher infection prevalence than nonexposed individuals from reference sites, suggesting that anthropogenic pollution predisposes individuals to this disease in natural systems, (b) the effect of pollution on infection status did not vary significantly between two sympatric fish species, and (c) infected and noninfected individuals from both species did not differ significantly in selected immune and general‐health parameters, a result that deserves further study with increased sample sizes.

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Correlation Between Pollution Trends of Freshwater Bodies and Bacterial Disease of Fish Fauna

Cited by 16 publications

References 48 publications

Winter mortality of freshwater fish associated with parasitic infection

Winter mortality of freshwater fish associated with parasitic infection

Environmental threats and conservation implications for Atlantic salmon and brown trout during their critical freshwater phases of spawning, egg development and juvenile emergence

Epitheliocystis in wild marine fishes and its relation with anthropogenic pollution

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