Mohanakumaran Nair, C; Dr.Shahul,Hameed M(Cochin University of Science and Technology, August , 1993)
[+]
[-]
Abstract:
In India scientific commercial farming of Macrobrachium is yet to get a start, the major constraint being the lack of seed. Seed collection from the natural sources alone may not be sufficient, and in such cases seed production in hatcheries is inevitable. This necessitates knowledge of the reproductive biology of the species technology development for brood stock and larval rearing, and the optimum conditions required for larval development to undertake large scale seed production.The present study was taken up with the major objectives of developing a proper, simple and feasible technology for the larval rearing of Macrobrachium, with special emphasis on. mass larval rearing suitable for commercial level operations.
Description:
Department of
Industrial Fisheries, Cochin University of Science and Technology
Girija, S; Dr.Surendran, P K(Cochin University of Science and Technology, October 23, 1993)
[+]
[-]
Abstract:
The quality of minced fish, as mentioned earlier depends largely
on the type and quality of the raw material used, as well as
on the processing methods employed. Moreover, fish mincing
involves cutting up of tissues thereby increasing surface area
to a great extent and releasing of enzymes and nutrients from
the tissues. Due to these factors fish mince is relatively more
prone to chemical. autolytic and microbial spoilage. Hence study
of minced fish with these factors in focus is very important.
Equally important is the availability, price and preference of
the raw material vis-a-vis the end products and the storage
period it passes through. In the present study. changes in the bacterial flora. both quantitative and qualitative of the dressed fish, viz. Nemipterus japonicas and mince from the same fish during freezing and frozen storage have been investigated in detail. The effect of a preservative. viz. . EZDTA on the bacteriological and shelf life characteristics of the minced fish has also been investigated.
Attempts have also been made to develop various types of products
from mince and to study their storage life.
Asma, V M; Dr.Mathew, K J(Cochin University Of Science And Technology, December , 1993)
[+]
[-]
Abstract:
The present study was undertaken to make a detailed investigation
for_ the assessment of specific impact of commonly used biocides at the
lower trophic level of food chain i.e., microalgae by using batch culture
techniques in the laboratory. Microalgal representatives from three habitats
i.e., fresh water, estuarine and marine were investigated. The different
biocides selected are of common use in the agricultural practices.
Because of the importance of microalgae as live feed for larval
and postlarval stages of different aquatic organisms, the fluctuations
in algal populations as a result of biocide treatment will surely affect
the food chain. These studies are also of significance in setting the
criteria and standards for water quality management by suggesting threshold
values of different biocides tested, beyond which they affect the ecosystem
adversely. The thesis has been divided into six chapters
Description:
School Of Marine Sciences,Cochin University Of Science And Technology
Venkita Krishnan, P; Dr.George, M K(Indian Council of Agricultural Research, Central Marine Fisheries Institute, December , 1993)
[+]
[-]
Abstract:
The main objective of the present investigation was to study the biochemical genetic variability within the species and genetic structure of its regional populations from west coast. Realising the recent report of occurrence of oil sardine fishery in east coast of India, population samples from Mandapam and Madras were also included in the present investigation. The original data gathered on the population genetics of the species have helped to interpret and evaluate the results objectively. The important conclusions drawn from a detailed discussions on the subject would throw some light on the probable process of problematic fluctuations in the abundance of oil sardine fishery of India. The academic and applied values of present discoveries need not be emphasised. The data used for the doctoral thesis were generated during the ICAR ad-hoc project on the "Population genetic studies on oil sardine, sardinella longiceps to identity distinct genetic stocks", carried out at CMFRI, Cochin during the years, 1988-1991
Geetha, P; Dr.Ravindranatha Menon,N(Cochin University of Science & Technology, 1994)
[+]
[-]
Abstract:
This thesis embodies findings on a taxonomical investigation of a group of lower marine invertebrates belonging to the category coelomata. Bryozoans are well known both in fossil and recent taxonomical history. They comprise of about 5,000 living and 16000 fossil species. Bryozoans are well known for their taxonomic abundance and structural diversity,representing the various ecological niches ranging from the intertidal to the abyssal benthic. At a time when global marine biological diversity has become a concern of not only to the scientists but also to the policy makers,an understanding of species diversity and abundance are cardinal aspects of biological studies. Geological time scales which is known that by Pre-Cambrian, marine invertebrate diversity reach the maximum and this diversity has become more comprehensive as time advanced. Taxonomists a vanishing species of scientists have become more concerned in discerning patterns of species diversity. The basic tool for this is identification fo animals. with this idea in mind a detailed study of taxonomy of bryozoan was undertaken . The major part of this thesis is devoted to describe various species of bryozoans with detailed description and ecotypical variations.The pattern of distribution and abundance which are important aspects of animal groups have also been documented. Possible effects of heavy metal contamination on the tolerance and growth of bryozoans, a few species of which have been eliminated from the chronically polluted areas of Cochin backwaters have also been documented.
Description:
Division of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, cochin University of Science and Technology
Verghese, C P; Dr.Shahul,Hameed M(Cochin University of Science and Technology, May , 1994)
[+]
[-]
Abstract:
The present scenario of industrial fishing in India is that most of large trawlers are based at Visakhapatnam and congregate in the potential shrimp ground in the
upper East coast of India commonly known as the Sandheads. These are outriggcr vessels operating two or four trawl nets along with a testing trawl called try
net. In the early Seventies these vessels were operating on a very high economic return which was evident from the steady increase in number of outriggers over a period of twenty years. Since the total allowable catch has to be
shared by all vessels including the increasing fleet, reduction per vessel output is bound to happen. Therefore some of them could not survive the competition
and withdrew from the scene. The number of outriggers did not increase subsequently. However, there arose a doubt whether the existing fleet of about 180 vessels are fishing economically or whether there is any scope for further introduction of industrial vessels in the region. This study is focussing to the techno economic aspects of industrial fishing in the upper East coast of India
Description:
Department of Industrial Fisheries,
Cochin University of Science and Technology,
Muthu Velan, B; Dr. Krishnamurthy, Chennubhotla, V S(Cochin University of Science and Technology, June , 1994)
[+]
[-]
Abstract:
The importance of marine algae, often referred to
as seaweeds, has been felt over a long time and is
appreciated more and more in modern times. The economic
value of marine algae is understood both indirectly and
directly. The indirect benefit is due to the role of marine
phytoplankton as well as the benthic macrophyte biomass
along the shore and in the continental shelf, in primary
production of the sea. Direct benefit includes the use of
marine algae as food, feed, fertilizer and as source of
various products of commercial importance such as agar and
alginic acid. Hence to understand the potential resources of
seaweeds, their distribution, density, standing crop and
interrelated environmental parameters, a detailed study
(survey and ecological work) was carried out for a period of
20 months from August 1988 to March 1990 in South Andaman,
North Andaman, Middle Andaman, Havelock, Neil, Car Nicobar,
Terassa, Chowra and Bumpoka islands. However in South
Andaman, data were collected from five fixed stations
fortnightly during this period for the purpose of modelling
and system analysis.
Philip, K P; Dr. Kuruvila, Mathew(Cochin University Of Science And Technology, September , 1994)
[+]
[-]
Abstract:
Preliminary investigations revealed that 3. hamrur is the predominant
species along the east and west coasts of India while other species are
sparsely distributed and occur sporadically. In the present investigation,
aspects such as population parameters, breeding and feeding biology, fishery
etc. of _l:. hamrur of the north east coast of India (Fig.1) are dealt with.
Studies on the distribution, abundance and stock size of priacanthids
all along the Indian waters were undertaken. Taxonomic studies of the
priacanthid species encountered during the study from the Indian waters
is also attempted
Description:
Department of Industrial Fisheries, Cochin University of Science and
Technology
Kandan, S; Dr.Rengarajan, K(Cochin University of Science And Technology, November , 1994)
[+]
[-]
Abstract:
This Thesis contains a detailed account of the results of
the investigations on the "Studies on sea cucumbers of Minicoy,
Lakshadweep" from the Arabian Sea, carried out from January
1990 to December 1991. The results are presented and
discussed in six chapters, preceded by an "lntroduction",
"Review of literature" and "Materials and Methods". A brief account on the importance of sea-cucumbers, its general morphology, present status of sea-cucumbers and their fishery in India and the major objectives of the present study are given in the "lntroduction" "Review of Literature" has covered and reviewed almost all available published reports and informations on sea-cucumbers on global basis, with special emphasis on Indian region and particularly in Minicoy Island.
The Minicoy Island topography particularly the lagoon and
reef flat area, discretion of sampling stations, survey on
sea-cucumbers in space and time, analysis of samples both
in the field and laboratory, statistical analysis of data,
etc. and the period of study are given under "Materials and
Methods.
Description:
School of marine sciences, Central institute of fisheries technology, Cochin University of Science And Technology
Vaheed, Yavari; Dr.Thomas, M M(Cochin University of Science and Technology, December , 1994)
[+]
[-]
Abstract:
The Indian edible oyster Crassostrea madrasensis (Preston) is known to be a highly suitable candidate species for culture. Though Q, madrasensis has been subjected to intensive research, there has been no significant attempt to culture this oyster commercially. One major reason for the lack of interest in oyster culture could be the disparity in growth, survival and production reported by earlier workersf from different regions along the Indian coast. Greater predictability of production can create confidence and encourage entrepreneurs interested
in oyster culture. The present study, which is a detailed investigation on the influence of various environmental variables on growth and reproduction of Q, madrasensis, is not confined to the impact of only hydrological parameters but is also extended to study the effect of different degrees of aerial exposure on growth and survival. The main objective of the study is to develop a background for subsequent development of a site suitability index for culture of Q, madrasensis along the Indian coast. Two sets of experiments were conducted during the present study. Details of the experiments are presented in the thesis under two major chapters comprising four sections each. Each chapter has a separate introduction, materials and methods, results and discussion.
.
Preetha, K; Dr. Gopalakrishna Pillai, N(Cochin University of Science and Technology, December , 1994)
[+]
[-]
Abstract:
The thesis on the"Benthic ecology of selected prawn culture fields and ponds near Cochin” was taken up with a view to provide information on the qualitative and quantitative distribution of benthos and their relationships to prawnproduction of different culture ecosystems and to the physico-chemical parameters influencing their production. A two-year observation was carried out in nine selected prawn culture systems including perennial ponds (stations 1 to 4) seasonal fields (stations 5 to 7) and contiguous canals (stations 8 and 9) during December 1988 to November 1989. All macro- and meiobenthic organisms contributing to the faua were identified and their abundance, distribution, diversity, biomass and trophic relationships between benthos and prawns were studied. The environmental variables studied were temperature pH, salinity, dissolved oxygen, alkalinity, nitrite-nitrogen, nitrate-nitrogen, amonianitrogen, phosphate and silicate of bottom water and organic carbon and texture of the soil
The thesis is presented in 4 Chapters. Chapter I presents an’ INTRODUCTION to the topic of study and a review of relevant works to bring an awareness to the present status of research in benthos and benthic ecology. Chapter 11, MATERIALS AND MTHODS, includes the techniques of sampling, preservation of samples and methods of analyses of various physico-chemical factors and area covered under the study is also given in this chapter. Chapter III, HYDROGRAPHY deals with the results of investigation and discussion onthe physico-chemical parameters of water and Chapter IV, SEDIMENT covers the sedimentoloical characteristics of the different culture systems followed by a detailed discussion. Chapter V, BOTTOM FAUNA presents an account on the various aspects of benthos and benthic ecology and the details of prawn production. A discussion on the overall assessment of interrelations between abiotic and biotic factors is given in Chapter VI, DISCUSSION. A critical evaluation of the implication of benthic production on prawn production under culture conditions and trophic relationships are also included in this chapter. An executive SUMMARY of the observations made during this study is presented in the final section of the thesis .
Augustin, Antony; Dr. Babu, Philip(Cochin University of Science and Technology, December 8, 1994)
[+]
[-]
Abstract:
A comparative study of Glycogen phosphorylase from selected Cephalopods is reported in this thesis. A detailed investigation of an important glycolytic enzyme, phosphorylase, from a selected species, is undertaken. Loligo vulgaris, commonly known as squid, is selected as the source for the study. Phosphorylase is the key enzyme in the mobilization of chemical energy from glycogen and its role in the regulation of carbohydrate metabolism is well established. Although a good deal of information is available about phosphorylase from terrestrial animals, not much is known about the enzyme from aquatic fauna. In order to bridge this gap and also to compare the results with the findings from other sources, phosphorylase a was isolated from this marine mollusc and its properties studied in detail in this study
Description:
School of Marine Sciences, Cochin University of Science & Technology