Shubhajit Saha

University of Burdwan | B.U. · Department of Zoology

The widespread occurrence of Mercury (Hg) and its derivatives in the aquatic environment and risks to the health of local populations has necessitated investigations into its toxic effects on sessile species. The toxicity of Mercury was observed sequentially from 96 h acute exposure regime (behavioural endpoints) to chronic durations (haematologica...

Diazinon exposures have been linked to the onset of toxic pathways and adverse outcomes in aquatic species, but the ecological implications on model species are not widely emphasized. The objective of this study was to determine how the organophosphate pesticide diazinon affected hematological (hemoglobin, total red blood count, total white blood c...

There is limited information on fluoride toxicity and risk overview on ecotoxicological risks to aquatic invertebrate populations particularly molluscan taxa. This necessitated the assessment of toxicity responses in the freshwater snail, Bellamya bengalensis exposed to environmentally relevant concentrations of sodium fluoride. Under lethal exposu...

To examine the spectrum of selenium toxicity between hardy and less hardy species of the same life stages, short-term and longer-term exposures in juvenile air-breathing fish Channa punctata (Bloch, 1973) and non-air-breathing fish Ctenopharyn-godon idella (Cuvier, 1844) were assessed. Acute exposures revealed a greater 96-h median lethal concentra...

The hydrophilic nature and resultant persistence of neonicotinoids in aquatic systems increase the exposure duration for non-target organisms. The sublethal toxicity of the neonicotinoid Thiamethoxam® spanning sub-chronic and chronic durations was investigated in Clarias batrachus, a non-target freshwater fish species. 96 h LC50 value of Thiamethox...

Sustainable development necessitates the comprehensive management of water resources in light of diminishing supply and increasing demand. This review examines new developments in methods, instruments, and policies to deal with issues brought on by population expansion, urbanization, and climate change. It starts by looking at water conservation te...

The acute and chronic toxicity of lead to Anabas testudineus was determined in this study using static replacement bioassay testing. During the chronic toxicity studies, an experiment on the bioremediation of lead toxicity using Ocimum sanctum leaf powder was conducted. The 96 h LC50 values of lead for Anabas testudineus was 1.08 mg/L. Different bi...

Neonicotinoid insecticides (NNIs) are the fastest-growing class in agricultural protection. They target nicotinic acetylcholine receptors (nAChR) in pests, stimulating the nervous system at low doses and causing paralysis and death at higher concentrations. NNIs are used in crop protection, seed treatment, forestry, agriculture, and flea control in...

Three billion people globally rely on fish and other seafood as a significant source of animal protein. Despite being deemed illegal due to its ability to cause cancer, mutagenesis, and tumor development, formaldehyde is still in use to extend the shelf life of different fish and shellfish, which indicates the failure of awareness among people. For...

Purpose of Review Nanotechnology has transformed various aspects of contemporary life, technology, and research. This is evident in the rising global demand for and use of nanoparticles, leading to a corresponding increase in their discharge into the environment through diverse human activities. In the last few years, the rampant use of copper oxid...

Abstract: While widely used in agriculture, macrocyclic lactones have been relatively understudied in terms of their potential environmental impacts. The potential carcinogenic effects of macrocyclic lactones raise significant concerns, emphasizing the importance of further research into these alternative biopesticides. To better understand the tox...

Dimethoate, an organophosphate insecticide, was initially developed in 1962 for broad-spectrum management of a variety of insects such as mites, aphids, flies, and plant hoppers. It suppresses the acetylcholinesterase activity, resulting in nerve damage and death of that organism. Many organisms are observed to be harmed by dimethoate. Among them,...

The current study investigates the severe effects of commonly employed chemicals, such as phenol, on the freshwater bottom-dwelling annelids of Tubifex tubifex. In an acute toxicity test, phenol's 96-hour LC50 value against Tubifex tubifex was identified to be 221.552 mg/L. Using the GUTS simulation, which places the GUTS-SD model on top of the GUT...

Bellamya bengalensis (Lamarck, 1822) in one of the most important fresh water, edible, widely distributed snails found in India. This species is present throughout Asia and Africa, and of great medicinal as well as socioeconomic values. Moreover, it is a cheap source of protein which is even higher than some common fish and red meat groups. Besides...

The uses and applications of nanoparticles in our daily lives and on an industrial scale are rapidly expanding as a result of scientific and technological advancements. The production and application of nanoparticles are the subjects of nanotechnology. The worldwide use of nanoparticles is increasing daily because of their potential use and applica...

Our current study examines the significant impact of aniline on the fish feed freshwater benthic annelid, Tubifex tubifex, including mortality, changes in total protein concentration and antioxidant enzyme activity (catalase, superoxide dismutase, glutathione-s transferase and glutathione peroxidase), as well as the generation of oxidative stress (...

The sub-lethal toxicity of Chlorpyrifos on selected oxidative stress biomarkers (malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione S-transferase (GST), and reduced glutathione (GSH)) and acetylcholinesterase (AChE) activity was examined in the olfactory organ of Labeo bata under sub-lethal...

In the present study a trial for induced breeding of a minor bagrid Mystus vittatus was made by stripping methods using various doses (0.2, 0.3, 0.4, 0.5, 0.6 and 0.7 ml/kg body weight) of a synthetic hormone, Ovasis at 26, 28 and 30ºC to evaluate their breeding performance. During spawning their latency period ranged between 12-17h. Highest number...

Current environmental issues include heavy metal contamination. Cadmium pollution in aquatic environments harms aquatic creatures and can pass to people through food chains. Cadmium poisoning damages bones, kidneys and causes cancer. Tubifex tubifex is a well-known water pollution indicator because of its good adaptation power in environmental poll...

Apart from anthropogenic pollution, nitrate contamination is prevalent in practically all developing countries as a result of increased natural activities. The accumulation of nitrates in water bodies causes cumulative effects on living species, environmental receptors, and human vitality by accumulation along the food chain. Nitrates have recently...

The physiological effects of triazophos were examined using respiratory and behavioral endpoints in Bellamya bengalensis under a 96-hour acute exposure regime. Physiological manifestation of respiratory stress was measured using the rate of oxygen consumption while behavioral toxicity was measured using crawling reflexes, touch response, and mucus...

Abstract The incomplete combustion of organic compounds is a major source of polycyclic aromatic hydrocarbons (PAHs), which are pervasive contaminants (petrol, coal, wood and oil). Although human activities account for the majority of emissions, some can also be attributed to more benign natural processes, such as open burning, the seepage of petr...

Abstract: In about four decades ago DDT and other organochlorinated and organophosphate pesticides were banned due to their harmful effect on the environment. The worldwide market of organophosphate and organochlorine pesticides was replaced by neonicotinoid groups of insecticides. More than 125 countries are registered used neonicotinoids since t...

Abstract Because of their role as intermediary consumers in aquatic ecosystem food chains, aquatic non-chordates have long been used to assess water pollution. The majority of the time, the adverse effects of pollutants are assessed by their effect on oxidative stress enzymes or mortality, despite the fact that a simpler method exists—hemocytes. Th...

Strobilurin fungicide toxicity in aquatic species: A brief review Abstract Strobilurin family fungicides are commonly applied pesticides in agricultural farming globally. Because of their ubiquitous use as fungicides, they can reach aquatic ecosystems in amounts that can harm creatures. This review summarises the current understanding of the toxi...

ABSTRACT Ocean acidification (OA) is becoming increasingly ubiquitous as a result of rising Emissions of co2 and the prevalence of global climate change, harming a wide range of trophic levels, particularly those that rely on well-balanced ocean chemistry. Ocean acidification causes major changes in seawater carbon chemistry, has a wide range of ef...

This study evaluated Acetic acid (AA) and Benzoic acid's (BA) acute and sublethal toxicity by observing mortality, behavioral responses, and changes in the levels of oxidative stress enzymes in Tubifex tubifex. Exposure-induced changes in antioxidant activity (Catalase, Superoxide dismutase), oxidative stress (Malondialdehyde concentrations), and h...

The pesticide ecosystem impacts are very diverse, and depending on their persistence could exert their intrinsic toxicity within an acute to a chronic timeframe. This study examined the toxic effects of Diazinon on haematological and biochemical endpoints in Oreochromis mossambicus after chronic exposure. After a prior range fining test, fishes wer...

The increasing use of nano-based products raises concerns regarding potential risks related to their manufacturing, transportation, waste disposal, and management operations. We used the riverine carp, Capoeta capoeta, as an aquatic animal model to demonstrate the acute toxicity of silver nanoparticles (Ag-NPs). This study focuses on acute toxicity...

Climate-change-induced salinity increase affecting Sundarbans ichthyofaunal diversity: a critical review The review work provides evidence that during the past ten years, a rise in salinity caused by climate change has resulted in an impact on the ichthyofaunal community of the Indian Sundarbans. The western and central parts of Indian Sundarbans,...

Distribution of polycyclic aromatic hydrocarbons in aquatic habitats and benthic fauna toxicity: a review Polycyclic aromatic hydrocarbons (PAHs) are a class of chemical molecules that can be found in all environments. PAHs are classified as harmful pollutants that endanger the environment and human health. PAHs possess high hydrophobicity, tend t...

Disrupted behavior and respiratory distress effects of 96-h acute deltamethrin exposures in adult Mozambique tilapia, Oreochromis mossambicus, were investigated using behavioral indices and opercular movement, respectively. Deltamethrin concentrations were found to be associated with toxicological (lethal and sublethal) responses. At 24, 48, 72, an...

Polycyclic aromatic hydrocarbons (PAHs) contamination in fish fauna is widely assessed using indicators of antioxidant and biotransformation systems. The goal of this study is to confirm biomarker response patterns in following exposure to PAHs. We were able to evaluate: (a) the overall intensity of PAHs effects on biotransformation as well as oxid...

A review of the effects of pyrethroid insecticides on oxidative stress biomarkers in ichthyofauna Pyrethroid pesticides have been used to replace traditional pesticides in agriculture since the 1970s. Pyrethroids, on the other hand, are much more harmful to ichthyofauna than to mammals and birds. Fish-specific organs like the gills, as well as the...

The acute toxicity of mercury to the air-breathing fish Clarias batrachus (Linn.) was determined in this study using hematological (including hemoglobin, hematocrit, total erythrocyte count, total leukocyte count, and mean corpuscular hemoglobin concentration) and biochemical (including total serum protein, serum glucose, triglyceride, cholesterol,...

FishTaxa (2022) 23: 53-56 Journal homepage: www.fishtaxa.com Abstract Human activities are rapidly expanding, posing a danger to ocean biodiversity. A review of shark diversity in the Indian Sundarban Biosphere is presented in this present study. Out of the 70 shark species found in the Indian Ocean, researchers discovered 22 have a limited distrib...

The toxic effects of Zinc oxide nanoparticles (nZnO) on Branchiura sowerbyi and Heteropneustes fossilis, was assessed in a 96-hour acute exposure regime using behavioral (including loss-of balance and clumping tendencies) and physiological (mucus secretion and oxygen consumption) endpoints. While the relationship between behavioral, physiological b...

Abstract: The iconic Sundarban mangroves of the Bengal delta coast are very vulnerable to climate change. Already, saline intrusion, increasing cyclones and rainfall anomalies, and rising temperatures are producing a slew of social and economic issues. However, our understanding of the many climate change implications on Sundarban ecosystem service...

The Sundarban Biosphere Reserve of West Bengal occupies a major sector of the global mangrove ecosystem area. The reserve is a UNESCO World Heritage Site and an abode for the endangered Bengal tiger, which is facing extinction due to global climate change. The climate change has culminated to alteration of hydrological parameters, increased frequen...

Ecological processes and distribution of biodiversity within river floodplains are driven by the hydrological regime of the area. The relationship between fish abundance/diversity and surface water quality at four impact points of the Sashadanga oxbow lake was examined based on hydrological connectivity (distance of lake sections from parent channe...

The potentials for neurotoxicity and respiratory distress under 96 h acute diazinon exposures was examined using behavioural indices and opercular movement respectively in walking catfish, Clarias batrachus. Diazinon exposure concentrations were correlated with toxicological (lethal and sublethal) endpoints. The LC50 values and 95% confidence limit...

With the the support of the University of Guilan and the Iranian Society of Ichthyology, the "Ninth National and the First International Iranian Conference of Ichthyology" with the goal of exchanging ideas, synergy and updating knowledge in various areas of fish biodiversity, conservation of native fish species and protection of aquatic ecosystems...

The sub-lethal toxicity of Captan® on selected haematological (Hemoglobin, Haematocrit, Mean Corpuscular Hemoglobin) growth (Condition factor, Hepatosomatic Index, Specific Growth Rate), biochemical (serum glucose, protein), and endocrine parameters (growth hormone, T3 and T4) in Clarias batrachus was examined under chronic exposures. Captan® was a...

Behavioral and physiological toxicity thresholds of a freshwater vertebrate (Heteropneustes fossilis) and invertebrate (Branchiura sowerbyi), exposed to zinc oxide nanoparticles (nZnO): A General Unified Threshold model of Survival (GUTS) The toxic effects of Zinc oxide nanoparticles (nZnO) on Branchiura sowerbyi and Heteropneustes fossilis, was as...

Metal exposure impairs respiration, increases metabolic demand, and reduces energy stor-age/fitness in aquatic species. Respiratory impairment and energy store (via proximate analysis i.e., moisture, crude protein, ash and fat content) examined in acute selenium-exposed Indian major carps, Catla catla, Labeo rohita and Cirrhinus mrigala fry were co...

Diazinon exposures have been linked to the onset of toxic pathways and adverse outcomes in aquatic species, but the ecological implications on model species are not widely emphasized. The objective of this study was to determine how the organophosphate pesticide diazinon affected hematological (hemoglobin, total red blood count, total white blood c...

Objective Toxicant-induced behavioural changes reflect underlying physiological deficiencies that can be utilized to predict ecological risks. The present investigation was undertaken to determine the toxic impact of sodium fluoride on the juvenile and adult size group of Clarias batrachus (Order: Siluriformes; Family: Clariidae).Methods To determi...

In the present investigation, a comparative study on acute toxicity of mercury to air breathing fish, Channa gachua (Ham.) and non-air breathing fish, Cyprinus carpio (Linn.) was undertaken. The 96h median lethal concentration (LC50) for C. gachua (0.188 mg/l) was found higher than that of C. carpio (0.105 mg/l). From the result, the non air breath...

This study was conducted to determine the sub-lethal toxicity of Captan® on selected hematological (Hb, HCT, MCH) growth (K-factor, HSI, SGR), biochemical (serum glucose, protein), and endocrine parameters (growth hormone, T 3 and T 4 ) in Clarias batrachus under chronic exposures. Captan® was administered at predetermined exposure concentrations (...

In the present investigation, acute toxicity of the grey list metal, Zinc was carried out under laboratory condition to Cyprinus carpio (Linnaeus, 1758). The 96 h LC50 value of zinc with 95% confidence limits to C. carpio was recorded as 15.804 (15.083-16.721)mg/l. None of the unexposed fish died during the bioassay. Mortality rate of the exposed f...

Bifenthrin is a type-I synthetic neopyrethroid pesticide having eight different stereoisomers.The current study aims to assess the short-term toxic effect of Bifenthrin to freshwater fish, Heteropneustes fossilis. The 24, 48, 72 and 96h LC 50 values of bifenthrin to H. fossilis were 4.82, 4.47, 3.54 and 3.40 µg/l respectively. There was a significa...

The present investigation, acute toxicity of the fungicide, Bifenthrin, was carried out under condition to adult experimental Clarias batrachus Clarias batrachus (Linn.). The 96 h LC with 95% confidence limits of is 3.464 (3.032-3.779) µg l. The LC50 values for 24, 48, 72 50-1 and 96 hours exposure to Bifenthrin are 5.093µg/l, 4.659 µg l , 3.893 µg...

The present study explores the effects of municipal sewage on the malacofaunal diversity from eight sampling stations across River Ichamati. Altogether, 14 species (10 gastropod and 4 bivalve species) were recorded during the study period. The molluscan community were represented by two classes- Gastropoda and Bivalvia. astropoda was represented by...

Toxicity of fungicide Captan to a benthic worm, Branchiura sowerbyi (Annelida: Oligochaeta: Archioligochaeta: Tubificidae) along with their behavioural alterations was studied in the present investigation. The 24, 48, 72 and 96 h LC50 values of Captan to B. sowerbyi were 10.19, 9.51, 8.97 and 8.63 mg/l respectively. The rate of mortality of B. sowe...

ABSTRACT The present study was undertaken to determine the sensitivity of the freshwater tropical worm, Branchiura sowerbyi Beddard, 1892 (Oligochaeta: Naididae: Rhyacodrilinae) to fluoride on the basis of 24, 48, 72 and 96h lethal concentrations (LC1, 5, 10, 15, 50, 85, 90, 95, 99) and their behavioural responses. The 24, 48, 72 and 96h LC50 value...

The toxicity of selenium, in the form of sodium selenite, on freshwater tropical worm, Branchiura sowerbyi Beddard, 1892 (Oligochaeta: Naididae: Rhyacodrilinae) was studied. The LC values of selenium at 24, 48, 72 and 96h 50 were recorded as 7.086, 4.128, 3.117 and 2.180 mg/l respectively. The mortality of the worm significantly increased (p<0.05)...

Research & Reviews: Journal of Ecology CURRENT ISSUE Atom logo RSS2 logo RSS1 logo Journal Help SUBSCRIPTION Login to verify subscription USER Username Password Remember me NOTIFICATIONS View Subscribe JOURNAL CONTENT Search Search Scope All Browse By Issue By Author By Title Other Journals FONT SIZE INFORMATION For Readers For Authors For Libraria...

ABSTRACT In present investigation, acute toxicity of the pyrethroid pesticide Bifenthrin was carried out under experimental condition to adult Oreochromis mossambicus (Peters, 1852). The 96 h LC50 with 95% confidence limits of Oreochromis mossambicus is 2.423 (1.981-2.748)μg/l. None of the unexposed control fish died during the bioassay. Mortality...

Although the freshwater oligochaete, Branchiura sowerbyi Beddard, 1892 (Oligochaeta: Naididae: Rhyacodrilinae) has been used as an indicator organism to monitor aquatic pollution, the data on the toxic effects of the grey list metal, zinc on this worm is remained scanty. The present study was undertaken to determine the sensitivity of the worm, B....

The effect of sub lethal exposure (0.36, 0.72 mg/1) for paper and pulp mill effluent PPME) on the growth and reproductive parameters like condition factor, hepatosomatic index, maturity index and specific growth rate of the fish Clarias batrachus was studied. A relatively better condition factor was observed in control fish during the different day...

The presentation deals with diversity of ornamental fishes in five different wetlands of the Bongaon subdivision of West Bengal along with their probable threats and ways of conservation

In the present study, acute toxicity of the organophosphate pesticide, diazinon, was evaluated under experimental condition to adult Heteropneustes fossilis. The 96 h LC50 with 95% confidence limits of Heteropneustes fossilis is 16.56 (14.32-18.04) mg/l. None of the unexposed control fish died during the experiment. Mortality rate between each dose...

In the present study, acute toxicity of the fungicide, captan, was evaluated under experimental condition to adult Heteropneustes fossilis. The 96 h LC50 with 95% confidence limits of Heteropneustes fossilis is 6.26 (5.80-6.64) mg/l. None of the unexposed control fish died and the first fish died 18 h after exposure to captan (9.50 mg/l and 10.5 mg...

In the present study, acute toxicity of the organophosphate pesticide, diazinon, was evaluated under experimental condition to Oligochaete worm, Branchiura sowerbyi. The 96 h LC50 with 95% confidence limits of B. sowerbyi was 2.87 (2.50-3.17) mg/l. None of the unexposed control worm died during the experiment. Mortality rate between each dose and m...

The presentation deals with assessment of acute toxicity levels and behavioural responses of Tilapia fish exposed to pesticide captan

The Sundarban is the largest single block of tidal halophytic mangrove forest in the world. It is a UNESCO World Heritage Site covering parts of Bangladesh and Indian state of West Bengal. The Sundarban represents a rich biodiversity of flora and fauna and it offers diverse animal communities due to its diversified habitat in terrestrial, intertida...

The poster portrays the seasonal variation in physico-chemical parameters of a wetland of North 24 Parganas of West Bengal

The poster is a review made on plankton diversity in the Sunderban

This poster deals with the study on fish diversity of a wetland at North 24 Parganas, West Bengal

Abstract The Sundarban is the largest tidal halophytic mangrove ecosystem in the world. In the present study a review work was carried out on the faunal diversity, their availability and present status in the brackish water of Sundarban. The study also includes brief overview of the geology, climatic changes, hydrology and salinity of water which a...