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Introduction
Ecosystem modeling, Fisheries Acoustics, Reservoir Fisheries Management
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Publications
Publications (54)
The foodweb of the Karapuzha reservoir ecosystem was constructed using modelling software Ecopath with Ecosim. This reservoir has a high biomass of primary producers that can support a fairly large fish biomass. Ecotrophic efficiency values of zoobenthos show that these primary consumers are heavily consumed. Hence at higher trophic levels flows ar...
Despite the beneficial role of aquatic food, bioaccumulation of trace metals can increase health risk for consumers. We conducted a comprehensive study to understand the levels of various trace metals (Cd, Co, Cr, Cu, Fe, Ni, Pb, Zn and Mn) in fish (Nematalosa nasus, Gerres filamentosus, Arius arius, Gerres erythrourus, Sardinella fimbriata, Caranx...
Plankton forms an important component of the aquatic ecosystem and act as indicators of fish diversity, pollution levels and environmental disturbances. They form an important natural fish food resource and play a vital role in the trophic structure of the ecosystem. In the present study a systematic assessment of the community distribution and div...
The present study aimed to assess the water quality dynamics (physicochemical properties, nutrient and
chlorophyll–a) in the Netravathi-Gurupur estuary, India across the space and seasons and to simplify the complex
water quality dataset through a chemometric approach. The results indicated that pH, EC, temperature, alka�linity, salinity, TDS, ha...
Various environmental indicators were used to evaluate the water and sediment quality of the Netravathi-Gurupur estuary, India, for trace metals and pesticide pollution. The descended order of studied metal concentrations (μg/L) in the water was Fe (592.71) > Mn (98.35) > Zn (54.69) > Cu (6.64) > Cd (3.24) > Pb (2.38) > Cr (0.82) and in sediment (m...
Estuaries are the most productive transition ecosystem and phosphorus (P) plays an important role in these ecosystems. Therefore, in the present study, sequential extraction method was used to determine the abundance of five sediment P fractions (calcium (Ca-P), Iron (FeP), aluminum (AlP), exchangeable (Ex-P) and organic (OrgP) bound P) in Netravat...
The growth and sustainability of freshwater aquaculture are highly dependent on economic feed which is the major running cost. Fish feed industries depend on the high-priced fish meal (FM) as protein source in feed formulations. In this context, a nutrient-rich, and palatable insect meal–based fish feed was developed incorporating the black soldier...
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...
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...
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...
Nile tilapia, Oreochromis niloticus, is one of
the most established among the introduced fishes in
inland waters of India. The population characteristics
of O. niloticus from Kelavarappalli Reservoir, a small
reservoir of Tamil Nadu, were studied. The von
Bertalanffy growth parameters (VBGF) were estimated
using ELEFAN. The L∞ values were 38.7 cm a...
Handout about the black soldier fly and its utilization
The fisheries sector plays a vital role in the food, nutritional and livelihood security of people, especially in the rural regions of India. Reservoirs, the man made impoundments built on rivers/streams obstructing the surface flow, form an important resource for the fish production besides holding up economic growth through various cultural and e...
Abstract Comparative estimates of trophic status and energy flow were carried out in a tropical reservoir ecosystem
in India to assess the impact of fish stocking. Mass-balanced models of the reservoir ecosystem were constructed for
two periods – 1982–1983 and 2002–2003 – using ECOPATH software to determine the impacts on different groups
before an...
The trophic interactions and energy flows of a tropical reservoir was carried out to assess the effect of stocking carps as a management strategy on the food web of the reservoir ecosystem using mass balance modelling. The model structured around 13 ecological groups which included the most dominant catfishes Mystus spp. The trophic level of the re...
The dietary analysis of the spiny eel, Mastacembelus armatus showed that the fish subsisted mainly on small forage fishes. The gut contents were analysed using the frequency of occurrence, numerical counts and gravimetric methods. In addition to fishes, the gut content comprised prawns, insects, aquatic plants and digested matter. The index of rela...
A network model of trophic interactions in a tropical reservoir in India was developed with the objective to quantify matter and energy flows between system components and to study the impact of invasive fishes on the ecosystem. Structure of flows and their distribution within and between trophic levels were analysed by aggregating single flows int...
Population Dynamics of Macrobrachium malcolmsonii in Wyra, a tropical reservoir in India was studied. The growth parameters, mortality rates exploitation rates and maximum sustainable yield and corresponding fishing mortalities were evaluated. The von Bertalanffy parameters of growth are estimated as L∞ = 20.3 cm and K = 0.63 per yr. The instantane...
Comparative estimates of trophic status and energy flow were carried out to assess the impact of environmental management measures taken to conserve the fish stocks in tropical reservoir ecosystem in India. Mass-balanced models of reservoir ecosystem was constructed for two periods, for 1995–1996 and 2002–2003 using Ecopath software showing the imp...
The present paper deals with the distribution and abundance of perch resources in the Indian EEZ, based on trawling operations by FORV Sugar Sampada during cruises 1-90. Perches are available at depths 23-250 m; including the 27 stations along the Andaman Sea these were present in 151 stations. Trawling at depths within 100 m was more productive th...
Although in order to exploit tiicse minor aemersai resources there are no specialised fishing efforts, their contribution to demersal Jinjish production is substantial, mostly exploited by bootom trawl-ing in recent years. The annual flat fish production has been amounting upto 63,344 t in 1992, that of goatfishes upto 33,300 t in 1991 and of white...
The marine catfish production showed a continuously declining trend all along the Indian Coast, from 67,666 t (1982) to 37,518 t (1995), while the situation is alarming along the SW and SE coast. This group is one of the most vulnerable resources for irrational harvest during their migratory and breeding phase. With the advent of mass harvesting ge...
At attempt is made to analyse the bottom trawl fishing data collected by 91 cmises of FORV Sagar Sampada (1985-'91). The vessel trawled in 544 stations spread over both the coasts up to a depth of 100 m and catfishes appeared in 54 stations with catch 3-2401 kg/hr. The dominant species occurred beyond 50 m depth belt was invariably Tachysurus thala...
The present paper deals with the distribution and abundance of perch resources in the Indian EEZ, based on trawling operations by FORV Sugar Sampada during cruises 1-90. Perches are available at depths 23-250 m; including the 27 stations along the Andaman Sea these were present in 151 stations. Trawling at depths within 100 m was more productive th...
The marine catfish fishery of India during 1979-88 laid special emphasis on the stock and exfdoitation of two major species Tachysurus thalassinus and T. tenuispinis. These together constituted about 50% of the total catUsh landings of the country. Catfish production registered increase in the 1970-89 period, but the high fishing pressure in the me...
The present paper deals with the fishery of flatfishes and flatheads along the west coast of India. Among flatfishes, the malabar role Cynoglossus macrostomus contributes significantly to the catch; Psettodes erumei also forms a fishery along Maharashtra and Gujarat Coasts. Among flatheads Platycephalus macuUpinna contributes to the fishery. These...
