Uttam Kumar Sarkar

Uttam Kumar Sarkar
Central Inland Fisheries Research Institute | CIFRI · Reservoir and Wetland Fisheries Division

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About

270
Publications
143,503
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Introduction
Captive breeding (7 spp.), reproductive traits (15 spp.), larval rearing protocols (7 spp.) and gene banking (5 spp.) of prioritized food fishes were developed and standardized besides stock characterization of Indian Major Carps, Clarias magur and Ompok bimaculatus from 25 different populations which was a breakthrough in conserving the fish biodiversity. Contributed significantly in exploring, evaluating and characterizing the current spatio-temporal pattern of fish biodiversity of the river Ganges basin. Presently, working as Head of the Division of Reservoir and Wetland fisheries and leading research project on Climate change and inland fisheries at ICAR -CIFRI.

Publications

Publications (270)
Article
Present study is the first attempt to assess effectiveness of supplementary stocking of the fingerlings of Indian major and minor carps on fish yield, per capita fish production and fishers’ income and analysis of relationship between stocking density versus yield and yield versus water area in floodplain wetlands of North Eastern India. Data on cu...
Article
Full-text available
The present study was conducted for 240 days to evaluate the effects of stocking density based on growth attributes, digestive enzymes, muscular composition, biochemical and physiological responses of Labeo rohita fingerlings in tropical inland open water cages. L. rohita (30.35 ± 1.08 g) were randomly distributed into three treatments, namely low...
Article
Full-text available
The rapid degradation, overexploitation, and encroachment of floodplain wetlands have led to considerable decline in fish diversity and production from these invaluable aquatic resources threatening livelihood of the dependent fishers. The climate change evident in the fast few decades has further aggravated the problem of eutrophication causing wa...
Article
Full-text available
The pattern of spatial fish assemblage, diversity, habitat, and potential impact of Nile tilapia (Oreochromis niloticus) was studied in a tropical reservoir of central India during June 2018–July 2019. A total of 21 species under six orders nine families and 18 genera were recorded which is comparatively low than previous records. The fish abundanc...
Article
Full-text available
The geographic information systems (GIS) play an important role in all geospatial aspects of assessment, monitoring, and management of inland open water resources for strategic development in the fsheries sector. In India, reservoir fsheries development is one of the fagship programme and several initiatives have been taken up towards enhancement a...
Article
Wetland fisheries are most vulnerable to climate and anthropogenic change, and therefore, vulnerability assessment is essential for the formulation of prudent management strategies. In the present study, vulnerability assessment was carried out in nine floodplain wetlands from three districts of West Bengal using stakeholder perception and ecologic...
Article
Full-text available
The present study describes the rearing and growth performance of Hilsa (Tenualosa ilisha) fry in experimental trial performed in earthen pond ecosystem located adjacent to river Rupnarayan for developing in-situ rearing protocol of fry collected from the wild sources. The seed was collected during May, 2020 from the river and stocked in two differ...
Poster
Full-text available
Fisheries enhancement through pen culture of Indian major carp Labeo catla for small scale beel fishers of NE region, India during COVID pandemic: A regional study
Article
The understanding of patterns in fish assemblages is imperative for management and conservation plans. There is a dearth of information on the environmental factors affecting the fish community structure in the reservoirs built on the intermittent rivers of India. We hypothesized that the environmental factors most likely influenced the patterns in...
Preprint
Food Web Modelling is used as a method for an interpretation of ecological processes and for studying the impact of fishing on biodiversity. An overview of ecological dynamics, as well as the significance of interactions between functional groups was obtained by modelling Ecopath with Ecosim in Karapuzha reservoir, in India. The modelling exercise...
Article
Full-text available
India has different bioclimatic zones and supports diverse aquatic habitats rich in biodiversity. For effective conservation of the endangered species in its habitat, it is essential to know the distribution of fish species in the environmental range, and for this, species distribution models are the efficient and innovative tools. The present stud...
Article
Full-text available
Eutrophication level in lakes and reservoirs depends on both internal and external phosphorus (P) load. Characterization of sediment P fractionation and identifying the P pollution sources are important for assessing the bio-availability of P and the dominant P source, for effectively controlling the water pollution. For determining the availabilit...
Preprint
The rapid degradation, overexploitation and encroachment of floodplain wetlands have led to considerable decline in fish diversity and production from these invaluable aquatic resources threatening livelihood of the dependent fishers. The climate change evident in the fast few decades have further aggravated the problem of eutrophication causing wa...
Article
Full-text available
The COVID-19 pandemic has created unprecedented human health crisis in recent global history with rippling social and economic effects. The outbreak in India has resulted in emergency lockdown in the country for more than 2 months, and that caused decline in the catch, demand, and supply of fish. It has severely altered the life and livelihoods of...
Article
Full-text available
Worldwide, freshwater ecosystems are facing threat due to environmental hazards and management strategies are needed for sustainability of the resources. The present study focusses on organochlorine pesticide (OCP) residues detected in the water and selected fish samples of catfish and minor carp species (Cirrhinus reba) collected during the experi...
Preprint
The present study aims to understand the spatio-temporal dynamics in habitat ecology and fish assemblage and determine the relationship of habitat transition and fish distribution in a large riverine- reservoir cascade system (Sardar Sarovar Reservoir part in Madhya Pradesh). This study was carried out along a 125 km riverine- reservoir interface d...
Article
Full-text available
Pen aquaculture technology, a low-cost aquaculture system for floodplain wetlands of India, was evaluated through a pilot study as an alternative livelihood for increasing adaptive capacity under changing climatic scenario. Five pens (100 m2 area each) were constructed in a floodplain wetland and provisions were made to adjust heights during the mo...
Article
Changes in aquatic ecosystem due to anthropogenic or natural process are growing concern which requires regular monitoring for water quality to formulate guidelines for their proper management. The present study aimed to understand the limno-biotic status of nine different small (Kanva, Votehole, Anjanapura, and Gayathri) and medium (Jambadahalla,...
Article
Full-text available
Ciliate epibionts associated with freshwater invertebrates, such as crustaceans and rotifers are reported to be widespread in marine but much less in freshwater aquatic ecosystems and their ecological roles are not well known. The epibionts association with invertebrates increases significant biomass in aquatic ecosystem. Aquaculture farms commonly...
Article
Full-text available
The present study deals with the broader understanding of phytoplankton assemblage pattern and their ecohydrological interactions in two ecologically distinct floodplain wetlands of Teesta − Torsa basin, India. Analyses of data revealed significant seasonal variations (p ≤ 0.05) of ten water variables (temperature, transparency, pH, conductivity, t...
Conference Paper
Full-text available
In the developing countries, inland fisheries enhancement through culture-based fisheries (CBF) has been recognized as an environmentally friendly sustainable technology, which is bound to contribute for nutritional security and livelihood support of increasing population. However, the development and demonstration of CBF in the reservoirs of diffe...
Article
The present study assessed the occurrence and impact of heat waves on the ecology of two ecosystems namely Bhomra wetland and Ganga River stretch, India. The water samples collected from these ecosystems were analyzed for estimating the hydrological and biological variables during heat wave. The inland heat index (IHI) was derived from the climatic...
Article
Full-text available
Invasive species exert a strong impact on the trophic structure and functioning of the ecosystem they occupy. A modeling software globally used to assess these impacts is Ecopath with Ecosim. This study measures the effects of two invasive species, African catfish Clarias gariepinus, in the food web of the Karapuzha reservoir ecosystem in India. Th...
Article
Full-text available
An experiment was conducted to study the influence of environmental parameters and stocking density on growth, survival, feed utilization, and economic feasibility of a high value butter catfish, Ompok bimaculatus in floating cages in a large tropical reservoir of India for 180 days. The fingerlings (11.44 ± 1.33 cm; 8.05 ± 3.27 g) were stocked at...
Article
In India, large rivers are experiencing serious threat to aquatic biodiversity, and therefore flagship projects are being executed on freshwater biodiversity conservation using various methods and strategies. Ganga River is the largest and longest river of India supporting rich commercial and artisanal fisheries for decades. Periodical and systemat...
Article
A detailed investigation on mass mortality of fishes was conducted in a small tropical reservoir- Derjang (20o50’32.0”N, 85o01’14.8″E), Odisha, India. Mortality mostly occurred in Systomus sarana followed by Labeo rohita, Cirrhinus mrigala, Labeo catla, Ompok bimaculatus, Labeo calbasu and Mastacembelus armatus. During 20 days of disease occurrence...
Preprint
Full-text available
In recent years closed and seasonally open oxbow lakes and river floodplains are subjected to eutrophication due to disconnection from river that compromises the hydro-ecological functions. This requires systematic studies to assess the ecological health of the water bodies using different indices and suggest appropriate strategies to manage the re...
Article
Fish assemblage structure in Palair reservoir, a medium tropical reservoir along the river Paleru, a tributary of river Krishna in Southern India, was studied along the spatial gradient of the impoundment. The abundance and assemblage structure of wild fish aggregated around the fish cage units installed in the reservoir were assessed and compared...
Article
Full-text available
Inland open-access fisheries of India are important resources that contribute significantly to the national economy while providing livelihood to millions. The majority of these resources are suitable for aquaculture, with a high potential for enhanced inland fish production. Enclosures (cages and pens) installed in such waters are useful for reari...
Article
Full-text available
Documenting and updating life history traits of wild fish are prerequisite for undertaking any conservation and enhancement programme from inland waters. The spotted snakehead Channa punctata (Bloch, 1793) is an important small indigenous food fish in Asian countries which has high nutritional and commercial value. This is the first work on describ...
Preprint
Full-text available
The present study was conducted for 240 days to evaluate the effects of stocking density based on growth attributes, digestive enzymes, muscular composition, biochemical and physiological responses of Labeo rohita fingerlings in tropical inland open water cages. L. rohita (30.35±1.08 g) were randomly distributed into three treatments, namely low st...
Article
Full-text available
Biological invasions are a worldwide threat to the aquatic systems and have the potential to homogenize entire foodwebs and shift species abundance distributions to more skewed ones. Invasion impacts include effects on the foodweb structure and ecosystem functioning leading to a loss in native fish biodiversity and commercially important fisheries...
Preprint
Full-text available
The geographic information systems (GIS) play an important role in all geospatial aspects of assessment, monitoring and management of inland open water resources for strategic development in fisheries sector. In India, reservoir fisheries development is one of the flagship programme and several initiatives have been taken up towards enhancement and...
Article
Full-text available
The present study evaluated the effectiveness of stocking the Gangetic carps, viz. Labeo catla, Labeo rohita, and Cirrhinus mrigala, in a large tropical reservoir, Uttar Pradesh, India. Time series data of 22 years (1998 to 2019) on fingerling stocking and fish harvest were collected from the State Department of Fisheries, Govt of Uttar Pradesh. Th...
Article
Cirrhinus mrigala is an Indian major carp originally inhabitant of the Ganga River system in Northern India. There is paucity of knowledge on age and growth of this commercially important species from Ganges basin. To fulfill this gap, 250 samples of C. mrigala were collected from the main channel of Ganga River and its five major drainages to eval...
Article
Floodplain wetlands are among the most threatened ecosystems. It is highly vulnerable to climate change, affecting the wetland ecosystem and its associated fisheries. In the face of data deficiency, this article presents an alternative approach to assess the vulnerability of wetland fisheries to climate change. A total of 15 wetlands from a wetland...
Article
Full-text available
The present study investigates the impact of climatic variability and fisher’s adaptation to climate-induced threats in a seasonally open floodplain wetland in West Bengal, India. The analysis of climatological trend indicated an increase in the air temperature over the last 2 decades and a gradual fall in the amount of rainfall to the tune of 36.9...
Article
Indian minor carp Labeo bata fingerlings were reared in square shaped cages at different numbers to evaluate the effect of stocking density on growth, production and economics. Fifteen cages (5 × 5 × 2 m each) were installed in deeper areas (6–8 m) of Samaguri beel (a seasonally-flooded floodplain wetland) of Assam, India. The cages were stocked wi...
Article
Full-text available
The taxonomic ambiguity surrounding several prominent genera of sciaenid has been a long imepdiment to research to solve species-level confusion on this groups. This study has been conducted for a compehensive assessment of species and phylogenetic relationship within the species and between the species through a combined osteological and morpholig...
Article
Full-text available
The present study assessed the impact of fingerling stocking of Indian major carps (Gibelion catla, Labeo rohita, and Cirrhinus mrigala) on fish yield in 24 small reservoirs of Central India. The time series data on fish stocking and yield were collected from the State Fisheries Department, Govt. of Chhattisgarh, for the year 2008 to 2016. The fish...
Article
Full-text available
The ultimate role of prokaryote (bacteria and archaea), the decomposer of the wetland ecosystem, depends on its community structure and its interaction with the environment. The present study has used three universal prokaryote primers to compare prokaryote community structure and diversity of three distinctly different wetlands. The study results...
Article
Tropical reservoir ecosystems cover more than 3.51 million ha in India which are the major sources of fish production from inland open waters and supports rich diversity of fish. The present study quantifies fisheries enhancement and evaluates the impact of stocking of Indian major carp fingerlings in six large reservoir ecosystems of India. Analys...
Article
India is endowed with vast floodplain wetland resources (0.5 million ha), which provide both livelihood and nutritional security to much of the rural populace. These biologically sensitive ecosystems are threatened by a range of anthropogenic and climatic factors. Assessment of their ecological vulnerability, and of the environmental threats that t...
Article
The climate of Brahmaputra valley (located in the North-eastern Indian state of Assam) witnesses considerable changes with sub-tropical rain-storm atmosphere and has four well-defined seasons (monsoon, post-monsoon, winter and pre-monsoon) in a year. The state is experiencing extreme climatic events like erratic rainfall patterns (causing abnormall...
Article
This study assessed the vulnerability of 16 floodplain wetlands (beels) of the Lower Brahmaputra Valley, Assam, India, in relation to a range of natural and anthropogenic factors including climate change. The total water-spread area of the selected beels varied widely (8–50 ha), with 68.75% of the beels showing a reduction in water-spread area over...
Article
Reservoirs are aquatic resources with the potential to increase India's fish production through inland fisheries. Thippagondanahalli is a medium-size reservoir on Arkavathy River, a tributary of the Cauvery. It is located in Bangalore rural district of Karnataka (12°58’24” to 12°96'49" N 77°20’33” to 77°35’63” E) and has a water surface area of 116...
Article
Wetlands are among the most productive of all aquatic ecosystems. In developing countries, millions of marginal fishers rely solely on wetlands for security of both nutrition and livelihood. The decline in wetland fisheries owing to anthropogenic and climatic changes has made fishers increasingly vulnerable. Pen culture can be an effective climate-...
Article
Climatic variability threatens inland ecosystems, fisheries, societies and economies globally. The impacts are evident in India as manifested by altered geographic distribution, loss of species, change in breeding period, life cycle and physiological behaviour of inland fishes. In India, several inland fisheries research advancements have been made...
Article
The small-scale fisheries sector plays very significant role in Indian fisheries. Fish life history parameters such as growth and morality are considered important factors for their conservation and management. Accordingly, the population parameters of a commercially important freshwater clupeid fish, Gudusia chapra (Hamilton, 1822) of Mathura...
Article
Full-text available
The regional climate has significantly warmed with erratically declining annual rainfall and intensified downpour within a narrower span of monsoon months, which led to an increased trophic state (≈algae) in most inland waters. Freshwater clupeids vitally control the aquatic food chain by grazing on algae. Despite increasing food availability, IUCN...
Article
Full-text available
Floodplain wetlands are ecologically sensitive habitats and considered the most threatened systems due to anthropogenic factors and climatic variability. These wetlands are important fisheries resources in India and provide nutritional and livelihood security to rural mass besides ecological services. The country has witnessed ecological degradatio...
Preprint
Full-text available
The COVID-19 pandemic has created unprecedented human health crisis in recent global history with rippling social and economic effects. The outbreak in India has resulted in emergency lockdown in the country for more than two months and that caused decline in the fish catch has severely affected the life and livelihoods of the fishers. The wetlands...
Article
Full-text available
Larvae of the parasitic dioctophymatid nematode, Eustrongylides Jägerskiöld, 1909, infect various freshwater fishes. They prefer warm waters and are often found in water bodies that experience pollution and eutrophication. A total of 1180 samples of fish belonging to 12 species from Nagawara lake were examined for the occurrence of Eustrongylides l...
Preprint
Full-text available
India has different bio-climatic zones that support diverse aquatic habitats rich in biodiversity. For effective conservation of endangered species in its habitat, it is essential to know the distribution of the fish species in the environmental range and for this species distribution models are the efficient and innovative tools. The present study...
Article
Phytoplankton, the primary producers in an aquatic ecosystem, also act as indicators of pollution by alterations in species composition and population structure. Study on plankton dynamics in relation to environment forms the base of any aquatic ecosystem management. So, a study on the variations in the plankton population influenced by abiotic fac...
Article
For natural ecosystems as well as human development, freshwater bodies like reservoirs are critically important. Krishnagiri reservoir, a moderately impacted tropical reservoir of India, is an important source of freshwater. However, eutrophication status due to anthropogenic activities is a major threat to this reservoir. This endeavour aimed to d...
Article
Full-text available
Minnows are the most ignored yet indispensable group of freshwater fishes in Asian inland waters. The reproductive resilience of minnows facing climatic variability, using a wetland inhabiting species Amblypharyngodon mola (Mola carplets) in lower Indo-Gangetic floodplains, was validated. Results revealed that spawning decision in females (threshol...
Article
The one-stripe spiny eel (Macrognathus aral, Bloch & Schneider, 1801) under the family Mastacembelidae, a native ornamental fish, were collected from the freshwater ponds and canals of West Bengal, with a purpose to raise the colony as ornamental fish broodstock. During acclimatization, fish were found to be lethargic and reluctant to consume feed...
Article
The pattern of a fish assemblage of a large reservoir, Stanley (also called as Mettur) in Peninsular India was studied to derive various management protocols, specifically fish enhancement. The investigation was carried out in the spatial and temporal scale of the reservoir during 2017–2019. A total of 52 species belonging to 35 genera were recorde...
Article
Full-text available
Effective fisheries management depend on having an exact assessment of biological parameters, including growth parameters, reproduction, size at sexual maturity ( L m ), and stock assessment. The purpose of this research was to estimate the size at sexual maturity ( L m ) for 20 fish species belongs to 14 families from a wetland (Gajner Beel ) ecos...