238 research outputs found
Remote sensing and GIS in marine fisheries management
This chapter outlines the use of modelled and satellite remote sensing
(SRS) data in supporting the research, technology-develop ment and
management of marine fishery resources. Numerical models are useful for
studying fish and other aquatic invertebrate larval transport. SRS data are
used to locate fish stocks, locate areas of reef stress and delineate areas of
high productivity in the wake of cyclone paths. Coupling SRS with models
helps to manage fishery resources on an ecosystem
Changes in primary productivity and impacts in fisheries
Fixation of inorganic carbon to organic carbon in the ocean is driven purely by
phytoplankton. Phytoplankton carbon fixation plays an important role in maintaining the
quasi-steady state level of atmospheric CO2. Relative contribution of marine primary
productivity to global photosynthetic production is between 10 and 50 percent. The
magnitude ranges from 20 to 55 Gt of C/ year (Ryther, 1969; Walsh, 1984; Martin 1992).
Ocean-atmospheric coupled climate models predict changes in the ocean circulation and
hypothesize that changes in the ocean circulation will stimulate phytoplankton biomass
production in the nutrient depleted areas in the open ocean (Roemmich and Wunsch, 1985).
The effect on atmospheric CO2 is uncertain because the relationship between the enhanced
primary production and air-sea exchange of CO2 is not understood. The challenge is to
study the magnitude and variability of primary productivity, its time scales and changes in
atmospheric forcing and upscale it into secondary and tertiary productivity
Making a Career Choice: From Confusion to Confidence
While choosing a career тАУ listen to your mind and conscienceтАж NOTHING else. Set
ambitions matching to your mental makeup and then think big / try to do the
impossible. There are elaborate theoretical texts available for future reading. But the
present chapter will give you some insights on developing yourself in mind and
knowledge for achieving the most fulfilling career
Empowering the marine fisheries sector with related research and development technologies - CMFRIтАЩ s initiatives and plans
Sustainable fisheries m anagement
options, if implemented properly, indicate
possible enhancem ent of harvestable
potential in Indian EEZ to a possible
extent of 6 million tonnes or more.
Opportunities in open sea cage culture
and related developments in the field of
mariculture during the last 5 years show
a way forward in open sea mariculture
practices and propose a production ideal
to the tune of 4 m illion tonnes in the
coming years from m ariculture sector
alone. High m ariculture production in
countries like China is due to production
of sea weeds and molluscs, but, the Indian
sea food market comprises mainly of fin
fishes of edible standards. If properly
implemented, there are possibilities that
the marine fish production may be
enhanced to the tune of 10 million tonnes
(6 million tonnes from capture and 4
million tonnes from mariculture) by 2050.
The present review reiterates the need
to revalidate the on-going management
measures scientifically and
pragmatically to enhance the marine fish
production in a sustainable manner
Marine fishery resources and food security
It is being increasingly recognized that
marine ecosystems have manifold services, much
beyond what we have been using so far. Aquatic
resources are now regarded as major contributors
to provisioning services that include health-food
supply and pharmaceutical products. There are
tremendous opportunities to advantageously make
use of the rich biodiversity; and the provisioning,
regulatory, cultural and supporting services of our
seas to meet the emerging demands of humankind
Python: A tool for analysis and visualization for remotely sensed datasets
Python is a programming language which helps you to tell the computer what you
want to do with the data that you have
Application of geophysical data sets to resolve ecosystem challenges
Satellite Remote Sensing (SRS) datasets are often used in empirical or semi-analytical
validated models, either to extrapolate regional datasets in space or to generate derived
geo-physical products. A simple example for this can be the summation of thermal signals
from different wavelengths for generation of SST. In a similar way, some of the most useful
and relevant environmental properties in fisheries research such as sea surface salinity (SSS),
Wind Speed (WS) and Wind Direction (WD), sea surface height (SSH), chlorophyll-a (Chl-a)
and Chl-a derived primary production (PP) are available online as processed and unprocessed
geo-physical datasets. These datasets can be used to advantage in various fisheries research
and management programmes
Classification techniques for remotely sensed data
Hyperspectral imaging sensors measure the radiance of the materials within each pixel
area at a very large number of contiguous spectral wavelength bands. So, they can generate
hundreds of images of a scene on the real surface. The radiance is converted into
hyperspectral data cube digital form. The spectral information available in a hyperspectral
image (cube) may serve to classify the nature of the target object because every material
had a unique fixed spectrum and could be used as a spectral signature of the material and
perhaps provide additional information for further processing and exploitation. Hyperspectral
data contain extremely rich spectral attributes, which offer the potential to discriminate
more detailed classes with classification accuracy
Role of calculus in marine sciences
Calculus has two parts: differential and integral calculus. Historically, differential calculus
was concerned with finding lines tangent to curves and with calculating extrema (i.e., maxima
and minima) of curves. Integral calculus has its roots in attempting to determine the areas of
regions bounded by curves or in finding the volumes of solids. The two parts of calculus are
closely related: The basic operation of one can be considered the inverse of the other. This
result is known as the fundamental theorem of calculus and goes back to Newton and Leibniz,
who were the first to understand its meaning and to put it to use in solving difficult problem
Marine resources of islands: status and approaches for sustainable exploitation/conservation with special emphasis to Andaman and Nicobar
Island ecosystem is unique but with a great diversity. Marine resource potential of Andaman and Nicobar Islands
(ANI) is underutilized. The sensitive ecosystems of corals and Mangroves are facing threats as a result of changing
climate. Potential fishery resources need to be exploited in sustainable manner for income and employment generation
of islanders. Primary data on resources of Bay Islands are collected resorting to standard survey methods and secondary
data are used as supporting data for analyzing the trend and potential of fisheries in ANI. The paper is depicting in
details the major marine resources and their status in Bay Islands and approaches for their sustainable exploitation and
conservation
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