Avishek Bardhan

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• Doctor of Philosophy
• Assistant Professor at The Neotia University

The study aimed to investigate the impact of administering the antibiotic florfenicol (FFC) through dietary means on Oreochromis niloticus . The experiment involved exposing the fish to FFC at doses 0 to 10 times the therapeutic dose of 15 mg/kg biomass per day for 10 consecutive days. The group receiving the therapeutic dose showed 100% survival o...

In the study on Oreochromis niloticus, singular oral gavage of florfenicol (FFC) at 15 mg/kg biomass/day was conducted, mimicking approved aquaculture dosing. Samples of plasma, bile, muscle, intestine, skin, liver, kidney, gill, and brain tissues were collected at 0, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, and 128 hours (h) after oral gavage. L...

Fish health assessment is essential for maintaining sustainable aquatic ecosystems and ensuring the well‐being of wild and farmed fish populations. Hematological parameters are crucial indicators of fish health, with poikilocytosis emerging as a fundamental marker with significant diagnostic value. Poikilocytosis refers to abnormally shaped erythro...

The aquaculture industry urgently requires effective bacterial disease management strategies, necessitating better regulation of antibiotic application. This study investigated the effects of oral oxolinic acid (OA) administration on Oreochromis niloticus at the recommended dose of 12 mg (1 ×) and overdose of 36 mg (3 ×)/kg biomass/day for 7 consec...

Biosecurity is a holistic and strategic concept that encompasses the frameworks, policies, and regulations aimed at analyzing and managing risks related to food safety, public health, animal and plant life and health, as well as associated environmental risks. The complex link between biosecurity measures and disease control in aquaculture is discu...

Aquaculture urgently requires effective bacterial disease management, necessitating improved regulation of antibiotic application. This study investigated the effects of oral oxolinic acid (OA) administration on Oreochromis niloticus at the dose of 12 (1×) and 36 mg (3×)/kg biomass/day for 7 consecutive days, relative to a control group. The 1× and...

The study investigated the prevalence of Aeromonas spp. and Escherichia coli, pathogens associated with diseases in both fish and humans, within retail market Labeo rohita and L. catla samples obtained from the Diamond Harbour region of the Ganges delta. The primary focus was to assess the potential risks posed by these bacteria in terms of antibio...

The aquaculture use of antibiotics can cause detrimental effects on fish organs and gut microbial dysbiosis. The impact of florfenicol (FFC) on fish intestinal histology, an approved antibiotic, remains unclear. This study aimed to investigate the effects of FFC on Oreochromis niloticus juveniles by administering FFC at 10 mg and 30 mg/kg biomass/d...

Seaweeds, which are macrophytic algae, represent a primitive category of plants that lack true roots, stems, and leaves. The majority of seaweeds fall into one of three divisions: Chlorophyta (green algae), Phaeophyta (brown algae), and Rhodophyta (red algae). In nature, there are approximately 900 species of green seaweed, 4000 red species, and 15...

Emamectin benzoate (EB) is an antiparasitic veterinary drug in temperate aquaculture to control ectoparasites. Research on its safety, tolerability and toxicity in tropical aquaculture is growing recently. This study examined the neurological and brain histopathological effects and the accumulation of tissue residues in all-male Oreochromis nilotic...

Biofloc technology (BFT) is gaining popularity in aquaculture. The primary objective of the current study was to examine intestinal bacterial counts in water and gut (stomach and hindgut) samples obtained from Oreochromis niloticus from different farms of North and South 24 Parganas. The total heterotrophic bacterial counts (THBC) and total bacteri...

Oxolinic acid (OA), a broad-spectrum quinolone antibiotic that plays a crucial role in human medicine, is often used in aquaculture as a second-line treatment at 12 mg/kg biomass/day continuously for seven days. The objective of this study was to assess its effectiveness against Aeromonas hydrophila infection in Nile tilapia Oreochromis niloticus i...

In aquaculture, oxolinic acid (OA) is used as a second-line treatment at 12 mg/kg biomass/day for seven consecutive days. The present study evaluated the biosafety of 21 days of dietary administration of OA at 0, 12, 36, 60 and 120 mg by assessing the growth, biochemical, erythrocytic morphological and histopathological alterations and residue leve...

Aquaculture success hinges on managing stressors that impact aquatic organisms' welfare, health, growth and survival. While salt addition is known for stress reduction and antiseptic properties, it poses osmotic challenges for freshwater fish. Our study assessed salt exposure's impact on healthy monosex Oreochromis niloticus juveniles. A one-hour e...

Aquaponics integrates pisciculture and hydroponics, yielding both fish and plants using a shared water medium. Aquaponics is a revolutionary concept in aquaculture specializing mainly within space utilization and integrated aquaculture. Plant transpiration utilizes water,while fish metabolic byproducts form nutrient-rich wastewater. Diverse microfl...

In aquaculture, drugs are often abused to accomplish disease control without considering the negative effects on fish health. This study aimed at elucidating the pernicious effects of in-feed antiparasitic drug emamectin benzoate (EB) abuse on the haemato-biochemistry and erythro-morphometry of healthy Nile tilapia Oreochromis niloticus. The fish w...

Aquaponics is a science that is part of the larger field of integrated agri-aquaculture systems, which tries to merge animal and plant culture techniques to bestow benefits and preserve nutrients and other biological and economic resources. It first appeared in the United States in the early 1970s and has recently had a renaissance, particularly in...

Simple Summary Florfenicol, an approved aquacultural antibiotic, is extensively used in temperate countries as therapeutics against several fish bacterial pathogens. It has never been introduced or used in several tropical countries. In earlier safety studies in tropical conditions, several alterations in the biological responses of Nile tilapia we...

A novel risk-based weighted scoring system was developed taking the risk of biosecurity measures of each biofloc technology (BFT) unit in two aquaculturally influential districts, North and South 24 Parganas, West Bengal, India, into account. The current study was carried out over a 6-month period to observe the incidence of Aeromonas veronii and E...

Escherichia coli is targeted as a model bacterium for monitoring antimicrobial resistance (AMR). In this study, 232 E. coli strains from carp aquaculture environments were screened for AMR against 12 antibiotics. Maximum resistance was found against cefalexin, amoxyclav, azithromycin, nitrofurantoin, gentamycin, and oxytetracycline. Multiple antibi...

Antibiotics are used in the treatment of bacterial diseases in commercial aquaculture. In this study, we the biological responses of Oreochromis niloticus juveniles upon dietary florfenicol (FFC) administration at 15 mg (1×) and 45 mg kg biomass⁻¹ day⁻¹ (3×) for 10 days in terms of feed intake, survival, biomass, hematological, erythro-morphologica...

Intensive fish farming often leads to the emergence of infectious and parasitic diseases, which require aquadrugs to control them. The present study evaluated the effects of 1× (50 μg/kg biomass/day) and 3× (150 μg/kg biomass/day) dietary emamectin benzoate (EB)-dosing on healthy Oreochromis niloticus for 7 consecutive days in comparison with contr...

Tilapia is one of the most consumed farmed fish, which requires the use of antibiotics in certain phases of its production. This study assessed the safety of 30 days of oral florfenicol (FFC) dosing at 0–10 times the therapeutic dose (1 × : 10 mg/kg biomass/day) in Oreochromis niloticus juveniles. Behavioural changes, feed consumption, mortality an...

The intensification of aquacultural practices demands the regulated use of antibiotics to contain diseases. This study investigated the accrual and depletion of florfenicol (FFC) and its metabolite florfenicol amine (FFA) in Oreochromis niloticus juveniles following dietary administration of 15 and 45 mg FFC/kg biomass/day for 10 days, the oxidativ...

Fish-borne parasitic zoonoses are primarily found in people living in developing and underdeveloped countries. The parasites that cause such zoonoses like Trichinella and Taenia are well-known in developed nations, but few people are familiar with fish-borne parasitic zoonoses, which are largely caused by helminths and protozoans. In general, paras...

Oreochromis niloticus is imperative in Indian aquaculture attributing to a significant portion of culture fisheries after carps. This study assessed the serum biochemical, haematological, and histopathological changes in O. niloticus juveniles upon dietary administration of florfenicol (FFC) at 15 mg/kg biomass/day (1X) and 45 mg/kg biomass/day (3X...

The uproar in antimicrobial resistance (AMR) among the aquacultured environment has led to the isolation of multiple antibiotic-resistant (MAR) Aeromonas strains. The current study aimed at the enumeration of antibiotic-resistant Aeromonas in carps of aquacultured environment and market samples. Isolation of Aeromonas was also done in Rimler-Shotts...

The application of antiparasitic drugs plays a crucial role in the removal of infectious parasites in aquaculture. Emamectin benzoate (EB) is predominantly used as a feed premix against ectoparasites on temperate fish. This study evaluated the influence of 14 days of EB-dosing at 0–10 times the recommended dose (1X: 50 μg/kg biomass/day) on the bio...

Tilapia is one of the most consumed farmed fish, which requires the use of antibiotics in certain phases of its production. This study assessed the safety of 30 days of oral florfenicol (FFC)-dosing at 0-10 times the therapeutic dose (1X: 10 mg/kg biomass/day) in Oreochromis niloticus juveniles. Behavioural changes, feed consumption, mortality and...

The fish borne parasitic zoonoses are limited basically to the occupants of underdeveloped and developing countries. However, a steady ascent of the population at risk is observable incomprehensibly because of the alterations in international markets and the impact on export and demographic changes. Population of developed countries are familiar wi...

Motile Aeromonas spp. are responsible for several diseases and pathological conditions in fish as well as gastrointestinal diseases in human. The present study aimed at isolating motile aeromonads from the retail market carps of peri-urban Kolkata and assessing their potential threats in terms of antibiotic-resistance. Among the 71 motile aeromonad...

Introduction: The worldwide growth of aquaculture has led to persistent infections and the emergence of antibiotic-resistant bacteria (ARB). The present study identified the similarity and correlativity of antibiotic susceptibility in the autochthonous bacterial flora of carps cultured in the East Kolkata Wetland and peri-urban Kolkata, India using...

Tilapia ranks second among the most cultured fish globally. It is also the most important farmed non-cyprinid fish accounting for over 20% of the global aquaculture production (6.6 million tonnes). To make up for anticipated deficits or losses in wild harvest, the tilapia industry is retorting, not only in its former strongholds throughout Southeas...

While gaining scientific and technical supports and worldwide approval for many processing and preservation techniques, the acceptance and use of food irradiation in India are also under stagnant position. Food irradiation can provide prospects to advance food protection and preservation by enhancing safety measures and minimizing microbial loads i...

ABSTRACT The study was carried out to find the prevalence and severity of Argulus sp. in Indian Major Carps (IMCs) collected from Bhangore block of South 24 Parganas district of West Bengal during November 2018 to August 2019. January (2019) recorded the highest parasitic prevalence (PFI, 83.33%) and the month of August (2019) recorded the lowest p...

Emamectin benzoate (EB) premix top-coated onto feed is extensively used to treat ectoparasitic crustacean infestations in aquaculture. This study evaluated the safety of EB-dosing in Nile tilapia Oreochromis niloticus at the recommended dose and dosage of 50 μg/kg biomass/day for 7 consecutive days (1X) and compared with control and 10 times the re...

The global rise in antimicrobial resistance (AMR) among bacteria causing infectious diseases and the associated risks on human health are well known. The uproar of AMR has provided with the most severe health threat of the century. The research on the AMR of the organisms present in the environment is, however, meagre. The bacterial species of the...

Aeromonas spp. are autochthonous in the aquatic environment and known for their aetiological role in motile Aeromonas septicaemia (MAS) of freshwater fish. In the present study, the susceptibility of five motile Aeromonas strains from the aquaculture environment was tested against 12 antibiotics. The mutation frequencies and minimal inhibitory conc...