66 research outputs found
Pd-catalyzed enantioselective aerobic oxidation of secondary alcohols: Applications to the total synthesis of alkaloids
Enantioselective syntheses of the alkaloids (-)-aurantioclavine, (+)-amurensinine, (-)-lobeline, and (-)- and (+)-sedamine are described. The syntheses demonstrate the effectiveness of the Pd-catalyzed asymmetric oxidation of secondary alcohols in diverse contexts and the ability of this methodology to set the absolute configuration of multiple stereocenters in a single operation. The utility of an aryne C-C insertion reaction in accessing complex polycyclic frameworks is also described
Geospatial Mapping of Fisheries Profile of Chhattisgarh state through GIS
Geospatial technology is fast growing segment of information technology
that combines multiple applications like GIS, remote sensing, cad, and imaging tools.
The geospatial technology capabilities in combination like other technologies can be
decision making tools for planning. In the present times fisheries and aquatic science
professionals are using GIS as a resource management tools. In this context, a study
was performed where mapping of fisheries profile of Chhattisgarh state was performed
through GIS tools having critical geographic dimensions. The mapped information can
be sued for the purpose of planning and decision making as each aspect of the map
has different components involved. For this purpose, at the core of the system the data
was asse4ssed at an integrated level from disparate sources mainly level statistical hand
book of Chhiattisgarh state at district level. Data was brought in tabular form through
Microsoft Excel and then joined to Arc info version 9.3.1 GIS Software with digitized map
of Chhattisgarh state to enable mapping. This was further synchronized and integrated
to generate four thematic maps searchable on several criteria
Evolving fisheries business in India with GIS
It can be seen through GIS that there are some states in India where fish consumption is less but production is very high. On teh other hand there are states, specially in North Eastern region, where fish consumption is much higher than production. In such regions, if the government adopts new fishing policy and technology, then production can be increased. The paper contains a thematic map, which is a very useful tool for planners, researchers, and people who are directly involved in fish business. The thematic map is a significant tool which directly explains the real scenario of fish production and consumption at state level
Promoting Aquaculture in Chhattisgarh
The Central Institute of Fisheries Education initiated
a project for mapping fish production across districts
in Chhattisgarh and a GIS tool has been developed to
analyse the data and put forward critical suggestions
for improving aquaculture in the state. Ram Singh
and his colleagues present a brief on how the project
was implemente
Impact evaluation of marine fisheries interventions among Tribal Fisher Commune of Car Nicobar Island, India
Fisheries and tourism are two important sectors that provide
livelihood and employment in the tropical Islands. Andaman and
Nicobar group of Islands is a biodiversity hotspot in the Bay of
Bengal inhabited by settler population along with indigenous tribal
communities. The Nicobar tribal community is one among occupying
the Nicobar group of Islands in the majority and are quite socialized
tribal communities of the Islands. Agriculture, animal husbandry and
fisheries are the major sectors that contribute to the livelihood and
nutritional security of the Nicobar tribes. Traditional fishing activities
have been a part of their culture over the years however, tribal
youths were reluctant in taking up fishing as a profession considering
the changing scenario and alternative employment options. To
reinstate fisheries as a profession and to improve their livelihood and
employment opportunities, interventions were carried out in Car
Nicobar Island. The interventions were mainly aimed towards
increasing fish catches, to expand their fishing grounds and to
sensitize safe fishing and navigation practices. Fishing inputs such as
modern fishing boats, GPS and outboard engines were provided as
inputs to tribal fishers based on the outcome of an expert
consultation meeting. Structured questionnaires were prepared to
analyze the impact of the interventions. The results indicated that the
interventions led to a significant improvement (p <0.001) in the
expansion of their fishing grounds (3.47 ┬▒ 0.2 km), reduced time
spent to reach the fishing grounds (2.3 ┬▒ 0.25 hour) and increased
catch per unit effort (7.93 ┬▒ 1.23 kg/boat). This study shows that
the targeted interventions coupled with awareness and sensitization
programmes could make fishing activities profitable, attractive and
can motivate the unemployed youths to opt for fishing as a
profession
Brackish Water Aquaculture
About 75 per cent of the world production of farmed shrimp comes from Asian countrie
Present Status and Prospects of Fisheries Resources, Fish Seed and Fish availability in Tripura
Tripura State has witnessed admirable growth in aquaculture sector, in
recent years and has potential for substantial improvement in production of
fish. The paper is an attempt to analyze the present status and future trend In
fisheries resources; fish seed production, fish production and availability of
inter-state fish, to make short-term projection. The State has rich potential
resources in the form of water area under culture and capture fisheries. Out of
the total culture fisheries resources, ponds and tanlcs contribute nearly 61.88
%. Out of total 1.34,010 fish farmers, highest number of fish farmers were
reported in West Tripura District, has 38.06 % of the total fish farmers,
followed by South Tripura District (29.48 %). Private fish farmers contributed
highest to total fish production from culture fisheries. The contribution of
carps (84.98 %) to the total fish production of Tripura was recorded to be the
highest among all the species. West and South Tripura Districts contributed
over two thirds of the total fish production in culture fisheries. Among capture
fisheries, reservoir Gumati alone contributed 43.08 % and available rivers
and rivulets contributed 46.97 %. respectively; to the fish production in
capture fisheries. South and Dhalai Tripura Districts contributed a major
portion (79.19 %) to the total capture fisheries production. Fish seed
production has been recorded to be higher than the requirements in the
State. The time series data on culture water resources, and production offish
and fish seed; showed that Tripura witnessed an exponential growth over last
one decade including sourcing of inter-state fish (ISF). Tripura is expected to
produce 63,616 mt fish, supplemented by 24,513 mt inter-state fish by the
end of 2015. During this period, culture fisheries resources are expected to
reach an area of 25,731 ha, while fish seed production is expected to be
aboute,043 lakhs
Structure and regeneration status of mangrove patches along the estuarine and coastal stretches of Kerala, India
This study presents the structural characteristics
and regeneration potential of mangrove patches in the
estuarine and coastal areas of Kerala, a tropical maritime
state in India. Field surveys were carried out at 46 selected
sites during August 2015 to May 2016. In each site, the
vegetative structure and regeneration status were assessed
using the quadrat method. Altogether 219 quadrates were
laid out and a total of 13 true mangrove species, belonging
to 5 families and 8 genera, were recorded. The total tree
density and stand basal area of the study region was
1678.08/ha and 20.33 m2/ha respectively. The low basal
areas indicate the reduced structural development in mangroves.
Of the 13 tree species, Avicennia constitutes 56%
of the total Important Value Index (IVI) and Avicennia
officinalis represents 41% of the IVI in Kerala, followed by
Avicennia marina (15%), Rhizophora mucronata (15%),
Sonneratia alba (8%) Rhizophora apiculata (7%) and Excoecaria
agallocha (7%). The diameter at breast height
(DBH) in the study area revealed that 47% of the tree
species came under the 1тАУ10 cm DBH class. Total sapling
and seedling density in Kerala was 2238.35 and 3232.42
individuals/ha respectively. Density of young plants (seedlings
? saplings) was only 31% greater of tree density
and varied from 3тАУ63%, which indicates poor regeneration
potential. The Maturity index value (MIV) and complexity
index (Ic) value of mangroves were 18.30 and 109.81
respectively. However, the low Ic value (\10) observed in
seven out of ten coastal districts indicated poor structural
development of mangroves in Kerala. Therefore, locationspecific
conservation and management measures, guided
by the knowledge on spatial distribution and habitat
requirements of mangrove varieties should be taken to
preserve the mangrove diversity of Kerala
Fishers in Post-harvest Fisheries Sector in India : An Assessment of Socio-economic Status
This paper presents the results of study carried out
during 2009-11, to assess literacy, health and income
status of fishers in India with reference to postharvest
sector which covered fishers in marketing
and processing. The study covered five states and
one union territory, covering 11 districts reaching
548 households. About 52.19% of the respondents
fell in the age group of 36-55. The average male- female ratio was 1.03 and 66.61% of the families
were in the small family category of 2-4 members.
It was observed that the literacy rates among fishers
in post-harvest sector in different states ranged from
63.74 to 95.81%. In general, the literacy rates were
comparable to the national average. Maternal and
child mortality were low in the sample studied and
the average birth weight of infants was 2.68 kg. The
average monthly income was Rs. 7027.45 with a
daily income of Rs. 234.25. About 44.70% of the
households had no savings and 47.81% of households
were in debt
Freshwater Aquaculture
Indian aquaculture has grown at a faster pace of almost 5.5 per cent per year consistently
since last 50 years. In some of the years the growth rate in the aquaculture was recorded as high
as 9 per cent. Indian aquaculture has demonstrated a six and half fold growth over the last two
decades, with fresh water aquaculture contributing over 95 per cent of the total aquaculture
production and more than half of the national fish production. The three Indian major carps,
namely catla (Catla catla), rohu (Labeo rohita) and mrigal (Cirrhinus mrigala) contribute the bulk
of production with over 1.8 million tonnes (FAO, 2003) Average national production from
fresh water ponds has increased from 0.6 tonnes/ha/year in 1974 to 2.9 tonnes/ha/year by
2009тАУ2010 (DAHDF, 2010), with several farmers even demonstrating production levels as
high as 8тАУ12 tonnes/ha/year. For the newly introduced fishes like Pangus the production
recorded was as high as 25 tonnes/ha/yr. At the national level as well as in state level, the
production and productivity has been on the rise over a period of time. Backed by new
policies like Fish Farmers Development Agencies (FFDA), National Fisheries Development
Board (NFDB) and state initiatives, there are enough incentives to increase the productivity of
fish per unit water areas
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