Sunila, George; Dr.Mohammed Salih,K Y(Cochin University of Science & Technology, March , 2000)
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Abstract:
The present investigations have considerably enhanced the existing knowledge on the biology and distribution/availability pattern of D.incarnatus in the Malippuram region. The species occurs in good concentration during October - March/April, and disappears from the area during late premonsoon and monsoon months. Recolonising the area in September, it grows fast in the subsequent months. The life span of the species is estimated to be about an year. Studies on the reproductive biology of the species have revealed that there are two spawning peaks, the major peak in February - March and minor peak, in December. The salinity regime of the area influences the reproductive activity. These observations form the original contribution in the thesis. The information on variation in water content, protein,glycogen and lipid levels in relation to reproductive cycle has helped to a better understanding of the gametogenic activity and spawning of the species. Similarly, the findings on salinity tolerance and filtration rate have shown that small sized clams exhibit greater tolerance range than larger clams, and grow at a faster rate with active metabolism. It is hoped that these information would considerably add to the present knowledge of the basic facts which are relevant to the improvement and management of the clam fishery of this region.
Description:
Department of Marine Biology, Microbiology and Biochemistry, Cochin University of Science and Technology
Annes, V H; Dr.Mohan Kumar, K(Cochin University of Science & Technology, June , 2000)
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Abstract:
The aim of the
present study is to understand the characteristics and properties of different wave
modes and the vertical circulation pattern in the troposphere and lower stratosphere
over Indian region using data obtained from the Indian Mesosphere-Stratosphere Troposphere
(MST) radar, National Center for Environmental Prediction/National
Centres of Atmospheric Research (NCEP/NCAR) reanalysed data and radiosonde observations.Studies on the vertical motion in monsoon Hadley circulation are carried out
and the results are discussed . From the analysis of MST radar data, an
overall picture of vertical motion of air over Indian region is explained and noted that
there exists sinking motion both during winter and summer. Besides, the study shows
that there is an anomalous northerly wind in the troposphere over the southern
peninsular region during southwest monsoon season.The outcome of the study on intrusion of mid-latitude upper tropospheric
trough and associated synoptic-scale vertical velocity over the tropical Indian
latitudes are reported and discussed . It shows that there is interaction
between north Indian latitudes and tropical easterly region, when there is an eastward
movement of Western Disturbance across the country. It explains the strengthening of
westerlies and a change of winter westerlies into easterlies in the tropical troposphere
and lower stratosphere. The divergence field computed over the MST radar station
shows intensification in the downward motion in association with the synoptic
systems of the northwest Indian region.
Description:
Department of Atmospheric Sciences,
Cochin University of Science and Technology
Mohammed Salih, K Y; Dr.Kurian, C V(Cochin University Of Science And Technology, April 18, 1977)
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Abstract:
It is the object of the present study to contribute so much information as possible on the biology and economy of M.casta on the south west coast of India. It includes investigations on the growth of the species in three dimensions.
Description:
Department Of Marine Sciences,Cochin University Of Science And Technology
Kuttyamma,V J; Dr.Kurian, C V(Cochin University of Science and Technology, 1978)
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Abstract:
Very little is known about the tolerance of the pensoid prawns in Indian waters under varying environment conditions ,except for a note on the salinityon
The growth of the juvenile papacus indicus by sreekumaran nair and krishnankutty there seems to be no work on this aspect besides the oxygen consumption of metsponecus dobsoni which is a major constituent of prawn fishery in this region has not been studied so far.T he present work comprises studies on the occurrence and abudance of penacid prawnsin two major estuaries in Kerala the kayamkulam lake and cochin backwaters the salinity and tempeture tolerance the effect of salinity on the growth of three comercially important prawns of kerala namely pensecus indicus, ,metaponaeus dobsoni, M monoceros and the respiratory metabolism of M. dobsoni.
Description:
School of Marine Science, Cochin University of Science and Technology
Sasidharan Pillai, N K; Dr.Shahul,Hameed M(Cochin University of Science and Technology, October 24, 1984)
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Abstract:
The present study of the parasitic copepods gives an account of the taxonomic description of seventy seven species of parasites collected from the food fishes
of the Kerala coast. Out of the seventy seven species described, fourteen are new to science, two new records for the Indian waters and ten new host records. The
males of Parapetalus longipinnatus Rangnekar and Lerna~thropus indicus Pillai were collected and described for the first time. The parasites described belong to the suborders Cyclopoida, Caligoida and Lernaeopodoida. The
available description of many species of this locality is reviewed and supplemented with the help of the present detailed study. The general observations made during this study reveale certain interesting aspects of the host parasite relationship, host specificity, adaptive modification and geographical distribution. A brief discussion
of these observations made is also presented.
Description:
Department of Industrial Fisheries, School of Marine Sciences
Cochin University of Science And Technology
Balasubramanian, C P; Dr.Suseelan, C(Central Marine Fisheries Research Institute, 1993)
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Abstract:
The present study deals with a general introduction which outlines the objective of the study providing an exhaustive review of works on crabs with particular reference to deep-sea forms. In the first section, Taxonomy and Geographical disribution of the crab are dealt with. The species is described in detail based on several male and female specimens obtained from the pelagic and bottom collections, and its identity in Indian waters is established. It is also distinguished from a closely allied species so far not reported from Indian waters. The second section comprises the biology of the species and it is dealt with under four subheading, namely Habit and Habitats, Reproduction, Food and feeding and Proximate composition. The different habitats occupied by juveniles, subadults and adults of the species have been described and discussed in the light of available information on differential distribution of other related species. The reproductive biology is described in various details touching on gross anatomy and histology of the reproductive systems, spermatogenesis, oogenesis, size at maturity, ovarian maturation process, fecundity, egg carriage and breeding. The food and feeding habits of the species have been studied with reference to the different life stages such as juveniles, subadults and adults during the different phases of life based on stomach content analysis. The percentage of meat recovery and protein, carbohydrate and lipid content of meat have been described in the section dealing with proximate composition. In section three the distribution and abundance of the crab for the entire Indian EEZ and some contiguous ares have been described and illustrated in detail separately for pelagic and benthic realms. The size frequency disrtibution, sex ratios, length weight relationship and relative abundance of breeding population in the experimental catches have been dealt with in detail and discussed.
Palanisamy, K; Dr.Parameswaran Pillai, P(Cochin University of Science And Technology, May , 1989)
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Abstract:
Culturing of fish in captivity demands a detailed knowledge on well balanced
diet and adequate feeding. Formulation and production of nutritionally
balanced diets for fish require research, quality control and biological
evaluation. It is often assuemed that what is ingested is also digested, but
this is not always be the case. Digestion depends upon both the physical state
of the food and the kind and quantity of enzymes in the digestive tract.
The ability of fish to digest a particular component of diet can be
ascertained by investigating the complement of digestive enzymes present along
the digestive tract. Investigations on the basic digestive physiology will not
only enhance our present knowledge on nutrition and feed development, but will
also contribute in understanding the digestive functions of lower vertebrates.
It is against this background that the present topic of investigation "Studies
on the digestive enzymes of the cultivable grey mullet Liza parsia Hamilton Buchanan, l822" has been selected. The thesis is arranged and presented in eight chapters.
Hemambika, M; Dr. Paul, Raj R(Cochin University Of Science And Technology, June , 1989)
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Abstract:
The efficiency of a diet not only depends on its nutrient composition and
nutrient balance but also on the effective utilization by the animal. In the
utilization of dietary nutrients, the digestive enzymes play the crucial role of
catalysing the hydrolytic reactions, splitting the macromolecules into simple
absorbable molecules. The activity of these biocatalysts is regulated by
alterations in pH, temperature, substrate type and concentrations, and also by
the presence of activators and inhibitors. Thus any shift from the optimum
conditions necessary for these enzymes may affect their activity, thereby
correspondingly modify the digestibility of the nutrients supplied to the
animals. Thus, investigations on the important digestive enzymes and their
preferential conditions of activity are essential, so that the results obtained
could be used in rationally adjusting the quality and quantity of feed supplied
to the different stages of prawns In India, directed research on nutritional physiology and biochemical approaches to digestion in commercially important prawns is taken up_ only recently, and the field is still in an infant stage. In view of its emerging importance it is identified as an area of priority and the present investigation has been carried out on the Indian white prawn Penaeus indicus
Description:
Centre Of Advanced Studies In Mariculture,Cochin University Of Science And Technology
George,K C; Dr.Kurian, C V(Cochin University of Science and Technology, October , 1979)
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Abstract:
The broad objective of the present study is to present a synoptic picture of the distribution and abundance of fish eggs and the lmportant groups of fish larvae obtained off the SW coast of India. so as to delineate the spawning areas and seasones of the fish population. with special reference to the scombroid fishes. An attempt was also made to correlate the occurrence of certain categories of larvae and hydrographical factors like
temperature and salinity. The present effort was a pioneering one in Indian waters. in as much as it involved systematic and seasonally repetitive collection of ichthyoplankton from a large
stretch of our seas and mapping of their distribution and abudance.
Description:
School of Marine Science, Cochin University of Science and Technology
Balchand, A N; Dr.Kurup, P G; Dr.Krishnan Nambisan, P N(Cochin University Of Science And Technology, November , 1983)
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Abstract:
The present study aims at the investigation of the
1ysico—chemical features of a tropical tidal river viz.
we Muvattupuzha river. This river is expected to receive
Jderate to heavy pollution loads in years to come, from
we lone industrial unit, already set up on its bank.
ilike other rivers, the geographical disposition of this
Lver attains unique importance as regards its dynamics for
3) availability of natural runoff water from catchment
:eas, which becomes very heavy during the monsoon season
3) regular steady availability of tail race water from a
/dro—electric power station throughout the yearThe study also aims at arriving at the balancing
forces of inherent self~purification of the river verses
pollution loads from the factory effluents. The investigation
period falls ahead of actual pollution occurrence
and so the ambient conditions for a period of nearly
one-and-a—half years were investigated, the analyses of which
providflz to formulate the inter-relations of parameters
varying with seasons. Tracer experiments were carried out
which revealed the dispersion and dilution characteristics
of the river in the vicinity of effluent outfall. The
studv covers the trial—cum-capacity production periods
of the factory during which effluents of various strength
and quantity were discharged into the river; a few computed
values arQ’cjmpgrQdl ... with the observed values. The
base data along with the profiles of Oxygen sag equation have
been utilized fb develop a mathematical model of the
river with regard to its water quality
Description:
Department Of Marine Sciences,Cochin University Of Science And Technology
Jomon, Joseph; Dr.Kurup, P G(Cochin University of Science and Technology, July , 1989)
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Abstract:
The thesis entitled Studies on the Dynamics of Cochin Estuary. This thesis is addressed to an investigation on the tidal, seasonal and spatial variations of the hydrographic parameters, circulation and mixing processes of the Cochin estuary. The present programme of study is aimed at obtaining a comprehensive picture of the tidal characteristics, hydrography, circulation and mixing present in this estuarine system during different seasons. The studies have been carried out through field collection of data on salinity, temperature and water currents to get a picture of their spatial and temporal variations. The hydrographic data have been analysed in relation to tide, rainfall and river discharges. From the findings it is seen that at the Cochin inlet, the estuarine features vary annually. During July and August, the estuary is characterised as almost saltwedge type; during June, September, October, December and January it shows appreciabie stratification, and during the rest of the months the estuary shows almost well mixed nature. Seasonal variations are well reflected in water temperature in the Cochin estuary, where the temperature reaches its maximum during the dry pre monsoon period with very weak thermal gradients indicating strong vertical mixing
Description:
School of Marine Science, Cochin University of Science and TechnoLogy