Mercy, Thomas; Dr.Damodaran,R(Cochin University Of Science And Technology, January , 1984)
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Abstract:
True crabs are the most fascinating group of
organisms among the decapod crustaceans. Great importance
is attached at present to the increased exploitation of
these animals and therefore there is great scope for
further development of their fishery. They have a
broad and hard carapace, massive chelate legs, bent
abdomen and exhibit high degree of adaptation to the
environment. They show pelagic, benthic, intertidal,
burrowing and terrestrial modes of life. Their commensal
association with other invertebrates, their breeding
behaviour and life history are of great interest to
biologists. More than six hundred species of crabs are
known to occur in Indian waters and among them
about eight species form a regular fishery along the
entire stretch of peninsular India (Rao §§_al., 1973)
round the year. Crab fishery in India is fast developing
and there is vast scope for them as there are many more
potential species. Among the various crustacean diets,
crabs are celebrated for deliciousness and for nutritional
richness. In recent days, crab food items have become
more popular and gained global reception. These resources
can also be augmented further by culturing them in ponds
in the future. Information on biology and ecology of
constituent species go a long way not only in effective
exploitation and regulation of the respective fishery
resources but also helps in evolving a suitable gear
for their capture. Information collected on the
national level in various aspects as reproduction, growth
rate, larval development, parasites, diseases, nutritive
values etc. will be of help in evolving a national
policy for the effective utilisation and conservation
of this resource. They also provide the baseline information
for undertaking any purposeful and meaningful
culture activities. Information on the various aspects
mentioned above is very much restricted in true crabs
and hence the present study
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Neelakandan Namboodiripad, K S; Dr.Kurup, P G(Cochin University of Science And Technology, March , 1984)
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Abstract:
The results of an investigation on the limits of the random errors contained in the basic data of Physical Oceanography and their propagation through the computational procedures are presented in this thesis. It also suggest a method which increases the reliability of the derived
results. The thesis is presented in eight chapters including the introductory chapter. Chapter 2 discusses the general theory of errors that are relevant in the context of the propagation of errors in Physical Oceanographic computations. The error components contained in the independent oceanographic variables namely, temperature, salinity and depth are deliniated and quantified in chapter 3. Chapter 4 discusses and derives the magnitude of errors in the computation of the
dependent oceanographic variables, density in situ, gt, specific volume and specific volume anomaly, due to the propagation of errors contained in the independent oceanographic variables. The errors propagated into the computed values of the derived quantities namely, dynamic
depth and relative currents, have been estimated and presented chapter 5. Chapter 6 reviews the existing methods for the identification of level of no motion and suggests a method for the identification of a reliable zero reference level. Chapter 7 discusses the available methods for the extension of the zero reference level into shallow regions of the oceans and suggests a new method which is more reliable. A procedure of graphical smoothening of dynamic topographies between the error limits to provide more reliable results is also suggested in this chapter. Chapter 8 deals with the computation of the geostrophic current from these smoothened values of
dynamic heights, with reference to the selected zero reference level. The summary and conclusion are also presented in this chapter.
Description:
School of marine sciences, Cochin University of Science And Technology
Ajitha Kumar, B S; Dr.Alagarswami, K(Cochin University of Science And Technology, March , 1984)
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Abstract:
This thesis deals with the reproductive physiology of the two species of Indian sea mussels, namely the brown mussel perna indica and the green mussel p viridis .The major aspects of the study include ecophysiology of reproduction linking up the animal reproductive cycle of the animals with the ecological conditions of the natural mussel beds, biochemical and histochemical changes associated with reproduction and neurosecretory cycle in synchrony with the reproductive cycle. Some basic studies on gamete morphology and certain aspects of gamete physiology have been taken up. The experimental work deals with the influence of different feeding levels on gamatogenesis and maturation and the effect of ganglia ablation on spawning. The material for the investigation on perna indica were collected from the natural mussel beds at Vizhinjam near Trivandrum and on p.viridic from Elathur, near Calicut. The period of observation extended from October 1981 to December 1982.
Description:
Central marine fisheries research institute, Cochin University of Science And Technology
Satyanarayana Murty, A; Dr.Sharma,G S(Cochin University of Science and Technology, March , 1984)
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Abstract:
It became so usual for the east coast of India to face at least IO to 15 cyclones every year, out of which 3 to 4 may reach the deep depression stage. As a result the east coast of India experiences frequent heavy damages of varying intensities due to storm surges and it is also not unusual to experience a calamitous deluge once in a decade or so. Loss of life and damages can be minimized only if the magnitude of the surge could be predicted at least a day in advance. Therefore, an attempt to study the storm surges generated by the cyclones that strike the
east coast of India and. suggest a method of predicting them through nomogram is made
Description:
School of Marine Science,Cochin University of Science and Technology
Cicily, P J; Dr.Samuel, C T(Cochin University of Science and Technology, May , 1984)
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Abstract:
The properties of synthetic fibres vary with thc inherent physical characteristics of the basic raw materials used mode of preparation of yarns and method of construction of twines. Since the synthetic fibres as maufactured from polymers which are synthesized from simple chemical units, the qualities of man-made fibres can he influenced by the process of manufacture and certain modifications can even be introduced at the processing stage to meet any specific requirement to a certain extent. Hence, an elaborate study of the properties of fish not twines produced has been taken up with a view to determining their suitability for various types of fishing gear with particular reference to conditions prevailing in India.
Sosamma,Cherian; Dr.George, Philip(Cochin University of Science And Technology, May , 1984)
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Abstract:
Alpha glucan phosphorylase plays a very
significant role in glycolysis. The inhibition and
activation of this enzyme have significant effect on
the rate of glycolysis. The rate of glycolysis is
also determined by the interconversion between the
active 3 and inactive Q forms of phosphorylase by
two specific enzymes called phosphorylase phosphatase
and phosphorylase kinase. The allosteric properties
and interconversion mechanism reported for
well—studied animal muscle phosphorylases do not
fall under a general pattern. Studies using
purified phosphorylase from marine sources are scanty.
Detailed studies using specialised tissues from more
marine animals are necessary to find the factors that
control the properties and activities of the enzyme.
This thesis is an attempt in this direction. The
thesis deals with a detailed study of the control of
the phosphorylase by both allosterism and
interconversion between the g and b forms from four
different aquatic animals of different habitat. Phosphorylase frm the four different animal muscles were purified either partially or completely and the kinetic and control properties were studied.
Description:
School of marine sciences, Cochin University of Science And Technology
Sathees, Chandra Shenoi S; Dr.Kurup, P G(Cochin University of Science and Technology, June , 1984)
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Abstract:
The coastal and nearshore areas have played vital role in the trade and economic development of coastal nations since ancient times. In recent years, the demands for utilization of these areas have increased for purposes of navigation, setting up of offshore structures for oil industry, exploitation of the available fishery and mineral resources, and to provide recreational facilities along the coast as a part of the coastal zone management. It is in this context the studies on nearshore processes receive greater priorities. Stability of beaches is controlled by the interaction of various physical parameters such as winds, waves, currents, tides and the nature and constituents of the beaches. The results of studies carried out by the author on the dynamical effects of these environmental parameters on the shoreline processes along the beaches around Cochin are presented in this thesis. The section of the coast investigated is about 57 km of shore from Azhikode to Anthakaranazhi situated on the central Kerala coast. Four regions namely Narakkal, Malipuram, Fort Cochin and Anthakaranazhi were chosen for detailed study
Description:
School of Marine Sciences, Cochin University of Science and Technology
Unnikrishnan Nair, N; Balakrishnan Nair,N(Cochin University of Science and Technology, July 10, 1984)
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Abstract:
A detailed study of the hydrography of the Cochin Backwaters, the habitat off crassostrea madrasensis has been carried out. Data pertaining to air temperature, water temperature, salinity, dissolved oxygen, turbidity and rainfall have been collected and presented. The temperature fluctuation was in the range of 5°C only and that of salinity between 1.1%o and 32.9%o. Fairly steady salinity has been recorded during the pre-monsoon period (February to May) and drastic declension during the monsoon period (June-September).Dissolved oxygen varied between 2.5 ml/l and 6.5 ml/l. Turbidity was highest in June (27.9 p.p.m.) and minimum (10.2 p.p.m.) in February. A detailed study on marine biofouling in the Cochin Backwaters has been made with special reference to primary film, settlement and growth of the fouling organisms such as hydroids, bryozoans, tube-dwelling polychaetes, barnacles and modiolus
Chinnamma, George; Dr.Gopakumar, K(Cochin University of Science and Technology, August , 1984)
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Abstract:
In this thesis all these aspects are taken into
consideration. Extensive studies were conducted on all
aspects of processing of crabs, mussels and clams. The
species taken for studies are commercially used ones
namely Scylla sereta, perna viridis, and villorita cyprinoids.
In Chapter 4.1 with regard to crab) the following
aspects on their handling and processing are reported
seasonal variation of chemical constituents, changes taking
place during ice storage, freezing, canning etc.
In Chapter 4._2 with regard to mussel, the relation
between age (size) and chemical constituents, changes
taking place during ice storage, freezing, canning etc. are
reported and in Chapter 4.3 the changes taking place in
clam muscle during icing and freezing are reported and the
ame rebility of ice stored clams for canning purpose is
reported.The interference of high concentration of glycogen
in mussel and clam muscles during the colour development
of ribose (Me-jbaum's method) is observed and remedial step
are taken to minimise the interference.
Muraleedharan,P M; Dr.Sharma,G S(Cochin University of Science and Technology, September , 1984)
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Abstract:
This thesis is an outcome of the studies, carried out by the author on the Equatorial Undercurrent
and the Equatorial Jet, an interesting and unique phenomenon discovered, recently, in the Indian Ocean (wyrtxi, 1973). The main objective of the thesis is to carry out a detailed investigation of the seasonal, latitudinal and longitudinal variation of the Equatorial Undercurrent in the Indian Ocean and also the Equatorial Jet, through mapping the vertical distribution of the oceanographic properties across the equator along various longitudes for all the months of an year, between SON and SOS, utilising the oceanographic data collected during the International Indian Ocean Expedition and subsequently in the equatorial Indian Ocean. As the distribution of the hydrographic properties give only a qualitative identification of the Undercurrent, a novel technique of computing the zonal flux through bivariate distribution of salinity and thermosteric anomaly introduced by Montgomery and Stroup (1962), is adopted in order to have a quantitative variation of the Equatorial Undercurrent and the Equatorial Jet. Finally, an attempt
is made to give a plausible explanation of the features observed.
Description:
School of marine sciences, Cochin University of Science And Technology