Sreekanth gb- PhD (Fisheries Resource Management), Post Doc- Aquatic Environment Management
- Senior Scientist at Indian Council of Agricultural Research
Sreekanth gb
- PhD (Fisheries Resource Management), Post Doc- Aquatic Environment Management
- Senior Scientist at Indian Council of Agricultural Research
Senior Scientist (Fisheries resource management), ICAR-Central Coastal Agricultural Research Institute, Goa
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Introduction
Current institution
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January 2013 - present
ICAR-CENTRAL COASTAL AGRICULTURAL RESEARCH INSTITUTE
Position
- Scientist (Fisheries Resource Management)
Publications
Publications (247)
Species distribution modelling (SDM) is a method that assists in linking the biotic and abiotic features of the ecosystems. In this study, we developed SDMs for total fish abundance, abundance of Escualosa thoracata (ET), Mugil cephalus (MC), Sardinella longiceps (SL) and Fenneropenaeus merguiensis (FM) based on biotic and abiotic variables using m...
Understanding the dynamics between native and invasive species in aquatic ecosystems is crucial for effective conservation and management. This study investigates the diet composition and niche overlap of the native paradise fish (Pseudosphromenus dayi) and the introduced three-spot gourami (Trichopodus trichopterus) in a coastal wetland in Kerala,...
Any biota on the planet Earth needs to be conserved following in situ and ex situ conservation methods. In the current scenario, in situ conservation is challenged by the impacts of climate change and global warming. Thus, it is essential to design ex situ conservation schemes that reserve the unique flora and fauna for future generations to effect...
A comprehensive study conducted from 2019 to 2021 in the Kavvayi estuarine wetland along India’s southwest coast documented its fish and crustacean diversity, providing valuable insights for conservation. Monthly surveys across 19 sampling stations recorded 151 species, including 79 demersal fish, 55 pelagic fish, and 17 crustaceans from 63 familie...
Quantifying the fish harvest from inland aquatic ecosystems is a major prerequisite for effective fisheries management. However, rigorous efforts are lacking in this direction due to erratic fishing patterns, isolated landing sites, and nonattendance of fishermen. Moreover, there is an urgent need of systematic evaluation of aquatic resources from...
KEYWORDS We report the presence of Shorthead fang blenny, Petroscirtes breviceps belongs to the family Blennidae from the Kavvayi estuarine wetland system, based on one specimen of the species obtained during the survey. The species was identified by traditional taxonomical tools and further confirmed using mitochondrial Cytochrome c oxidase 1 (CO1...
The fish assemblage and functional guild composition of Matla estuary (ME), Indian Sundarbans, was studied across different
estuarine reaches and seasons for the first time based on spatial and temporal data. A total of 57 finfish species belonging to
15 orders and 34 families were recorded during the study period from August 2022 to July 2023 alon...
Aim: To explore the spatio-temporal variation of phytoplankton diversity and community structure, in response to associated environmental variables in Matla estuary, Sundarbans, India. Methodology: Monthly sampling was carried out from August 2022 to July 2023 at three locations within the estuary. Plankton was identified and its dynamics were stud...
Estuaries, being prominent ecotones of aquatic environment, provide a ‘paragon of virtue’ beneficial to humans. The multitude of ecosystem services provided by these distinct yet fragile environments has gone unnoticed and less documented. In India, the majority of available information on estuarine functioning, health, biodiversity, and management...
Water abstraction and subsequent lowering of water table in Sasthamkotta, the largest freshwater lake in South West coast of India raised serious concerns on its management and future implications to terrestrial and aquatic associated fauna. Though a designated Ramsar site, Sasthamkotta Lake has been exposed to various anthropogenic stressors, whic...
The Mumbai metropolitan region has undergone rapid urbanization and economic expansion in recent years. Ensuring the sustainability of artisanal fishers' livelihoods and safeguarding coastal ecosystems poses a significant challenge to the city's overall sustainability. This study examines the ecological structure to ascertain how anthropogenic stre...
Crescent Perch, Terapon jarbua is one of the important food cum marine ornamental fish in India. The present study deals with the delineation of T. jarbua stocks along the Indian coast using the morphology of fish and otolith shape analysis. A total of 609 fish samples were collected from six major fishing harbours representing the Indian coast fro...
The study provides the first comprehensive account of the developmental biology of the Indigo barb in captivity. The males develop a reddish hue on the body and margins of their median fins, as opposed to the dull coloration of the females. The fish spawned 6–7 h after administering the breeding hormone, and the fertilized eggs were demersal and ad...
Estuarine research in India has been prioritised in the mid-21st century, and more noteworthy scientific studies have only been undertaken in the last ten years. Fish yield Estuaries in India play an important role in livelihood, ecology, nutrition, etc. inland fisheries, coastal protection, biodiversity conservation, and poverty alleviation. This...
This study aimed to estimate the relationship between fish size and otolith size of four creek-associated fishes (Anodontostoma chacunda, Epinephelus diacanthus, Johnius glaucus and Mugil cephalus) collected from the northeastern Arabian Sea from November 2021 to November 2022. The numerical relations were established using regression between fish...
This study investigates the fish assemblage in a temporarily-closed sandbar estuary along India’s west coast, across different zones and seasons. Moderate species diversity (54 species), low species abundance, varying fish diversity from lower to upper estuarine gradient (higher counts in lower zones, and decreasing from middle to upper zones), and...
The estuaries generate plentiful benefits to support the human life-generally known as ecosystem services (ES). However, many a times, these services remain unidentified and not evaluated especially for small estuaries (<10 km 2 area spread). To design a management framework for estuary, a quantified chart of ES is considered to be a powerful tool...
Globally, small temporarily closed estuaries are the least considered for fisheries assessments and management due to the lack of scientific glamour and regional limitations. However, these ecosystems are highly vulnerable to anthropogenic pressures and may deteriorate without documentation of valuable resources. In this background, fish diversity...
In this study, we evaluate the fish-based ecosystem services (ES) of Chettuva- a small tropical estuary (CE) on the south-west coast of India. Besides direct benefits (provisioning and cultural), the primary regulatory and supporting services provided by fish in estuaries were also documented using secondary data and focused group discussions (FGD)...
Sea urchins are spiny marine benthic organisms under the phylum Echinodermata. Being marine organisms, the larvae are often transported to estuaries by waves and settle on finding a suitable location to mark their presence in estuaries. The present paper deals with the first record of sea urchin from two estuaries along the West coast of India alon...
Chalakudy River is renowned for its pristine waters and rich ichthyofaunal biodiversity. The downstream area of the river is confronting a series of risks, including pollution, saline water ingression, sand mining, illegal and intensified fishing practices as well as invasion of exotic and alien species. A mass balanced ecosystem model was construc...
The estuaries along the west coast of India provide fishery resources to sustain the livelihood of many traditional fishermen along the coast. However, the knowledge of the fish communities of these estuaries is very limited. In this context, fish communities in Valapattanam (VAL) (moderate size) and Dharmadam (DHA) (small size) located along the w...
In this study, a diverse stakeholder assemblage representing different demographic ranges were interrogated about the functions and values of an aquatic ecosystem, Chettuva- a small tropical estuary in India's western coast. Almost all respondents—95%—agree that they depend on the Chettuva estuary in one way or another for their livelihood. They fr...
The estuaries along the west coast of India provide fishery resources to sustain the livelihood of many traditional fishermen. However, the knowledge on the fish communities of these estuaries is very limited. In this context, fish communities of the two permanently open estuaries; Valapattanam (VAL) (moderate size) and Dharmadam (DHA) (small size)...
In this study, an estuarine fish community index (EFCI) was applied so as to evaluate the ecological quality of Poonthura estuary, a temporarily closed sandbar estuary, located along the south-west coast of India. Specifically, the study examined the impacts of several natural and anthropogenic interventions, (1) a pollution mitigation plan of the...
Ramsar wetlands in India are rich in fishery resources but are not explored extensively for their existing fish biodiversity. There is a need for the continuous assessment of these sites to highlight biodiversity value for conservation-related aspects. As an initiative, an investigation on the exploited fishery resources of Ashtamudi Estuary, an in...
Integrated farming system (IFS) means a sustainable agricultural farming practice that integrates livestock, poultry, crops, bioflocs, pond culture practice and various other system that benefits each other. In this paper, energy efficiency and economic efficiency of a small scale Integrated farming system (farm area of 0.32 ha) situated at Alappuz...
Estuaries are transitional systems connected to both freshwater and marine ecotones. The ecological status, threats and fish community structure of small temporarily closed estuaries in India, particularly those along the western coast are poorly known. The present study conducted during 2021-2022 explores the Poovar Estuary and this forms the firs...
Estuarine and coastal ecosystems act as important habitats for several elasmobranchs. However, little is known about the species, spatial and temporal distribution patterns, and variability in abundance of elasmobranchs occurring in estuaries along the Indian coast. Fishery surveys in Zuari, a tropical estuary on the Arabian Sea coast of India duri...
The finfish catch structure of Ashtamudi Estuary, a Ramsar site of international importance was assessed from May 2019 to April 2020 covering ten major landing centers (Sakthikulangara, Sambranikodi, Mammottil kadavu, Ashtamudi, Perumon, Kurismmood, Cherikadavu, Arinalloor, Vellimon and Muttom). The annual finfish landings was estimated as 195.4 to...
This study investigated the diet composition and microplastic contamination in six fish species collected from the creek area of northeastern Arabian Sea. The results show that the diet of the fish is mainly composed of shrimps, algae, fish, and zooplankton, with microplastics constituting up to 4.83 % (Index of Preponderance) of their diet. The av...
The small estuaries represent the least recognized transitional systems and receive limited
research priority and management focus among the coastal ecosystems worldwide. Though they provide
numerous ecosystem services to the local inhabitants, these services are not adequately recorded
compared to large estuaries and coastal systems. In this st...
We present the quantitative characterization of Grande Island's off-reef acoustic environment within the Zuari estuary during the pre-monsoon period. Passive acoustic recordings reveal prominent fish choruses. Detailed characteristics of the call employing oscillograms and individual fish call parameters of the segmented data include vocal groups s...
The small estuaries represent the least recognized transitional systems and receive limited research priority and management focus among the coastal ecosystems worldwide. Though they provide numerous ecosystem services to the local inhabitants, these services are not adequately recorded compared to large estuaries and coastal systems. In this study...
Defining the ecological quality of estuaries is challenging because of the inadequacy of available methods and indices to characterise the ecosystem. In Indian estuaries, there are no scientific attempts to establish multi-metric fish index to determine the ecological status. A multi-metric fish index (EMFI) was customised for twelve predominantly...
The food and feeding links and sources in an impacted tropical estuary situated along India’s western coast, the Ulhas River Estuary (URE) was analyzed employing the stable Carbon and Nitrogen isotopic signatures (δ13C and δ15N). Three basal carbon sources, such as mangrove leaves, particulate organic matter (Phytoplankton) and detritus were analyz...
The yellowfin toadfish Colletteichthys flavipinnis was originally described from Sri Lanka and the east coast of India. In this report, we record the occurrence of C. flavipinnis from Kavvayi tropical estuarine wetland, Kerala, west coast of India, based on nine specimens having a maximum length of 235 mm. The species identity was corroborated usin...
A first hand study on guild structure of fish species (n = 148) in Ashtamudi Estuary, a Ramsar Site of International importance, was carried out from May 2019 to April 2020 based on temporal (monsoon, pre-monsoon and post-monsoon seasons) and spatial (upper, middle and lower zones) data. Guild composition consisted of eight estuarine use guilds (ma...
Fisheries and aquaculture have emerged as a promising food production sector at the global level as well as
regional levels. Fish and fish products are produced in one region and then are traded across various parts of the
world. The whole sector is dependent on chains of workers engaged at landing centres, breeding units, processing
units, and...
In this paper, we discuss various ecological indices to examine the health of coastal ecosystems and estuaries. A general brief is given on the different abiotic indices and biotic community indices that reveal the ecosystem health status. Further we discuss on the various ecological indices, ecosystem modelling framework and ecosystem services of...
Estuarine and coastal ecosystems act as important habitats for several elasmobranchs. However, little is known about the species, spatial and temporal distribution patterns, and variability in abundance of elasmobranchs occurring in estuaries along the Indian coast. Fishery surveys in Zuari, a tropical estuary on the Arabian Sea coast of India duri...
The COVID-19 pandemic-induced lockdown has indisputably affected the aquaculture industry across the globe. India imposed a nationwide lockdown to contain the outbreak of COVID-19 that disrupted normalcy and economic activities. The fisheries sector was also highly affected. Hence, a study was conducted from July – December 2020 to understand the s...
A meta-analysis of research on fishstock identification in India was performed to examine the trends and patterns of work conducted in fish-stock identification between 2000 and 2021. The publication data extracted from the Web of Science database with different sets of keywords resulted in a total of 214 research articles dealing with fish-stock i...
The Chettuva estuary is a small and shallow tropical estuary situated in Kerala, the western coast of India. In this paper, we did an attempt to identify the key provisional ecosystem services related to artisanal fishing and fishery derived from Chettuva estuary. Based on the stakeholders' perception, the major services identified were traditional...
Chettuva is one among the significant estuaries along south west coast of India with an area of 714 ha. A rapid survey was conducted to assess the fishery resources of estuary by collecting information directly from fishermen and using secondary data. Gillnet, cast net and stake net were the major gears and plank built canoe were the major craft us...
Ashtamudi Lake is a one of the largest and deepest estuaries in India with a spread of 51.2 km 2. The data on fisheries of this estimated using traditional methods. It is always challenging to quantify the Lake fishery accurately, which is largely unorganized, traditional and mostly unreported. Here, we propose a fish catch monitoring system for th...
Freshwater aquatic systems are source of livelihood/subsistence for the majority of the artisanal fishermen in Kerala. As per the IUCN criteria, 18 critically endangered, 31 endangered, 18 vulnerable and 13 threatened freshwater fish species are reported from Kerala. The lack of knowledge among the fishers on the vulnerability of the freshwater spe...
Present study focuses on the existing socioeconomic status of inland fisherfolk of two estuaries of Kannur district of North Kerala viz., Valapattanam and Dharmada. A total of 1614 active fisherfolk, under 5 inland fishing villages inhabits in Kannur district. An approximate of 420 and 130 fisherfolks depend on Valapattanam and Dharmadam estuary fo...
The fish guild structure of 96 fish species inhabiting the Vembanad Lake, an open, large, well-mixed coastal estuary along the south-west coast of India, was studied based on samples from upper (freshwater), middle (estuarine), and lower (saline) zones representing three major seasons (monsoon, post-monsoon, and pre-monsoon). Functional group asses...
Fish has emerged as an alternative model organism in biomedical research for conducting experimental pharmacological and toxicological studies. As a vertebrate, they share many conserved physiological and molecular features with humans that makes them valuable model for diagnosing, investigating disease states, for testing drugs to check toxicity a...
Asian Green mussel, Perna viridis (Linnaeus, 1758), is a bivalve mollusc with high market demand along India’s western coast, specifically in Goa. An experiment was conducted to compare the environmental variables, specific growth rate (SGR) and length-weight progression of the species raised in two different coastal aquaculture systems; a semi-enc...
The morphometry, length-weight relationship and condition factor of Escualosa thoracata (Valenciennes, 1847) from Goa waters was studied from 758 specimens. Males ranged in size from 80 to 117 mm and weighed 4.16 to 14.96 g, while females were 77 to 115 mm and 3.75 to 15.03 g. Among the compared characters, coefficient of correlation r were highest...
New records of Parascolopsis akatamae Miyamoto, McMahan, & Kaneko, 2020 are reported from India's southeast coast. Three specimens were collected in April 2021 on the Parangipettai coast, Tamil Nadu, India. We examined and compared morphometric and meristic characters of our specimens with published data from the holotype. The new India records exp...
This research compares a traditional Biofloc system to a Semi Recirculatory Aquaculture Biofloc system. The latter like the conventional Biofloc system, follows the same culture pattern, with the exception of a recirculatory mechanism integrated into the culture process, which could cause considerable differences. For this study, we chose two farms...
In this survey-based study, techno-economic efficiency and growth performance of Genetically Improved and Farmed Tilapia reared in biofloc-based units under Subhiksha Keralam project were evaluated. The culture system included five Biofloc tanks and one silpaulin tank culture (STC) having 25, 000 L each. The GIFT tilapia were stocked at 1250 finger...
A systematic checklist of fish and shellfishes of the Poonthura estuary, Kerala, India is provided including notes on their conservation status. This checklist includes 66 finfish and five shellfish, belonging to 17 orders, 35 families, and 60 genera. Carangiformes is the richest order (11 species, eight genera, and three families), representing 15...
The article deals with the various opportunities of fish farming in coconut gardens using the inter space available between the palms. The different aquaculture options separately for freshwater and brackishwater aquaculture are presented in this paper.
The article provides an overview of the different entrepreneurship opportunities in the fisheries and aquaculture sector including freshwater pond culture, brackishwater fish farming, Re-circulatory Aquaculture System, Biofloc, Aquaponics, fish-based Integrated Farming System, Cage culture, Mariculture, Integrated Multi-trophic Aquaculture and Offs...
Post-harvest loss in fisheries (PHFL) denotes the loss of harvested fish due to physical, quality and other unavoidable circumstances in the market. Here, the fish is being either discarded or disposed at a relatively inferior price. About 35% of the total harvest from world fisheries are subjected to PFHL annually. The detailed categorization of c...
Present study was carried out to identify six important species (Nemipterus japonicus, N. randalli, N. bipunctatus, Scolopsis vosmeri, S. bimaculatus and Parascolopsis aspinosa) under the family Nemipteridae based on their morphometric characters. A total of 360 samples were collected randomly from east and west coast of India. Twenty one morphomet...
Estuaries provide life support to aquatic biota and livelihood support to fishermen and local inhabitants. However, the ecosystem function of estuaries is impaired due to anthropogenic stressors and hence, the assessment of ecosystem health using ecological indicators will deliver the status of stability, maturity, and integrity of an estuary. In t...
A study was conducted to assess the faunal diversity in Gorai creek of Mumbai, India during August 2019 to July 2020, revealed 90 species of fauna under 70 genera, 50 families, 29 orders, 6 classes and 3 phyla. The order-wise representation of identified fauna was found to be 7 ichthyofauna, 4 pelecypods, 6 gastropods, 2 cephalopods, 1 shrimp and 1...
The early life history of a fish species is regulated by temperature, the most critical environmental cue. Thus, identifying the gradient of temperature that optimises the early development of a species is a prerequisite for standardising hatchery technology. Silver moony, Monodactylus argenteus is a tropical brackishwater ornamental fish that hold...
We present for the first time, data on fish assemblage structure for ten temporarily closed estuaries (TCEs) along the south-western coast of India. Fish community structure differed significantly between TCEs based on species presence/absence, estuarine use and feeding mode. Marine migrant and freshwater stragglers dominated the ‘fish guilds’, whi...
Invasive alien species (IAS) influences the trophic organisation and food web structure in an invaded ecosystem, and therefore it is imperative to quantify the resultant ecological impacts. The globally recognised ecosystem modelling platform, Ecopath with Ecosim was used to delineate the impacts of IAS on a tropical freshwater pond ecosystem in In...
An integrated farming system (IFS) is a farming approach that helps to conserve agrobiodiversity, provides food security, enhances ecosystem services, maintains environmental quality, and also achieves sustainability. In this study, we analyzed the energy transfer and trophic organization in an IFS comprising of fish (seabass, catfish, tilapia), li...
This study reports the first time record of the patchy coral reef (~ 2 km 2) of Terekhol in North Goa, the western coast of India during January-February 2020. There were more than 07 genera/species of hard corals in the reef and is dominated by a reef building Turbinaria mesenterina (Dendrophylliidae), which is considered as a sediment tolerant co...
Fish farming in existing channels and trenches in coconut gardens can enhance the income of farmer as well as food security. Ponds can be constructed in the available space, used for fish culture and a way for rain water storage. Pond water can be used for irrigation and the silt formed after fish culture can be applied as fertilizer. However, ther...
The wetland resources of Goa encompasses 12684 ha in inland and 6215 ha in the coastal zone. There are seven notified wetlands in Goa as per the revised guidelines of the Government of India. In this paper, we provide an overview of the fish diversity, current status, fishery, and management options for fisheries in wetlands. We also propose a part...
Vembanad Lake is the second largest brackish water lake in India and is known for its rich biodiversity. The study investigates the fish diversity, fishing methods, seasonal variation in species distribution, gear wise fish catch and fishermen profile at Puthenvelikara backwaters of Vembanad Lake. A total of 45 sampling events using gillnets, cast...
The concept of aqua-tourism entails visiting a working aquatic landscape operating for the purpose of leisure, refreshment, recreation, knowledge and participation in the activities of the premises including fishing, feeding in cages, dining and celebrating cultural events with the local inhabitants. Here we survey and analyse an aqua tourism unit...
Live fish trade, itself as the name suggests is the trade of fish in its living state with the intention of either for human consumption or aquarium trade. The trade of food fish in living condition has attained a great potential to enhance the market value, as the consumer psychology has always pave a way to spent money for fresh and rare species....
The small-scale integrated farming systems are very important agroecosystems that generate crop, animal and fish resources, economics, livelihood and multiple products for the farming community. In this study, the economic performance of a small-scale integrated farming system (farm area of 3155 m2) situated in the Alappuzha district of Kerala, wes...
Mussel farming is a breadwinning activity in the northern coastal districts of Kerala. The major green mussel farming areas are located in the Kavvayi backwaters of Kannur and Kasargod. The only species commercially cultivated in the region is Perna viridis (green mussel). The objective of this study was the economic evaluation of mussel farming in...
Cage culture of finfish is currently an important economic activity in estuaries of Kerala along the west-coast of India. In this study, the growth and techno-economic efficiency of cage culture using Pearlspot (Etroplus suratensis) were evaluated. The trials were carried out under the auspicious of Janakeeya Matsya Krishi Project, a developmental...
Coastal ecosystem being most vulnerable to climate change, a systematic assessment of coastal agriculture is needed. The characteristics of the west and east coast are typically different and need to be addressed with different approaches. To address the problems and constraints of this region, a detailed resource inventory about coastal agricultur...
In this study, a survey was conducted to evaluate the techno-economic efficiency of biofloc fish farming initiated under the financial assistance (subsidy) from Subhiksha Keralam project, a farming developmental initiative for fish farmers during the covid-19 pandemic period. In this survey, five biofloc units of Genetically Improved and Farmed Til...
In this survey-based study, techno-economic efficiency and growth performance of Genetically Improved and Farmed Tilapia reared in biofloc-based units under Subhiksha Keralam project were evaluated. The culture system included five Biofloc tanks and one silpaulin tank culture (STC) having 25, 000 L each. The GIFT tilapia were stocked at 1250 finger...
Feeding ecology and seasonal diet variation between a non-native (Oreochromis mossambicus) and two native cichlids (Etroplus suratensis and Pseudetroplus maculatus) in a tropical estuary was studied. E. suratensis and O. mossambicus fed predominately on blue green algae, whereas P. maculatus preferred aquatic insects. Trophic niche breadth analysis...
Estuarine fish assumes greater significance to the coastal fishermen in supporting nutrition and livelihood. However, the man made stressors caused serious decline n the estuarine ecological quality, which altered the fish community structure substantially. Here we review how we can apply the estuarine fish as an indicator for assessing the ecologi...
Agro-ecotourism is a type of tourism that makes use of rural culture as a tourist draw. It has taken on a new meaning as a possible source of income and employment. The synergy between tourism and agriculture is a critical component of ecologically and socially responsible tourism. Agro-ecotourism offers an opportunity to integrate different agricu...
Estuarine fisheries is a subsistence fishing activity along the Indian coast. The average fish production from the estuarine ecosystem is about 4-5 t /km2. The total count of fish species recorded from the Indian estuaries range from 30 to 250. The estuarine fishery is small scale and multi-species -mutigear sector. The estuarine ecosystem also sup...
COVID-19 has wreaked havoc throughout the planet within a short time frame, inducing substantial morbidity and mortality in the global population. The primary procedures commonly used to manage the pandemic can produce various environmental pollutants, primarily contaminants of emerging concern such as plastics, chemical disinfectants, and pharmace...
Estuaries provide enumerable ecosystem services to mankind in terms of provisional, regulating, supporting, recreational and information services. However, the persistent human-environment interactions for these services altered the ecological integrity of estuaries. Although the small estuaries receive little attraction in scientific studies due t...
Considering variability in salinity of estuarine waters caused by Indian summer monsoon, Indian estuaries are often called monsoonal estuaries which comprise an area of 1.44 million ha of which west coast estuaries accounts an area of 6.49 lakh ha. Documentation on fishery resources of estuaries of India were begun in late 18 th century. This paper...
The Sundarbans Delta, one of India's Ramsar sites, is an ecologically important wetland that is home to a variety of endemic and threatened aquatic species, including mudskippers. However, there is a knowledge gap about their fundamental aspects, such as population dynamics, reproductive biology and other life-history characteristics, which hindere...
Questions
Questions (12)
Dear friends
Please share me information on inclusion of migration rate (how to weight it, is it scaled from 0 to 1 for each cell in the spatial grid), habitat capacity (how to weight it, is it scaled from 0 to 1 for each cell in the spatial grid) and advection in the Ecospace model in Ecopath with Ecosim version 6.5.
This haemulid species is found at Grande Island Goa
Please help me in identification
Please help in identification, this is from Grande Island, Goa, SW coast of India.
Toadfish species collected from Zuari estuary, southwest coast of India
Dear Friends, I am trying ECOSYSTEM based modelling of Zuari Estuary (Goa, Southwest coast of India) with about 24 ecological groups. The basic inputs were provided and the model was mass balanced (adjusting the biomass of four groups) with Eco trophic efficiencies were kept under one. However, the respiration values are showing negative values and it is given as an error in result display. How should i adjust the input data (Diet matrix or Biomass which has to be adjusted) for making the respiration values to positive and within one.
CANONICAL CORRESPONDANCE ANALYSIS
Dear friends, I would hereby like to inform you that i have a two year data set (monthly observations as data points) consisting of abundance (log transformed) 40 species of phytoplankton and 15 environmental variables.
My objective is to identify the seasonal patterns in environmental parms and species abundance.
I have tried the canonical correspondence analysis for analyzing this data to identify the linear combination of species scores with environmental variables. But, the results are bit complex and i need your suggestions for analysis (better ordination techniques if any) and the modifications in the same analysis (data as well as analytical steps).
I found CANCORSP, REDUNDANT, PCA, CORRESP analysis as the best methods for ordination. Please help me in this regard
We have collected this wrasse species from an estuarine mouth (Zuary estuary, Goa) by hook and line fishing. Please help me identification
Thanks in advance for your replies.
