Jose, Joseph; Dr.Gopakumar, K(Cochin University Of Science And Technology, August 21, 1989)
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Abstract:
Frozen storage characteristics and shelflife vary
considerably among species as well as within the species
(Powrie, 1973; Fennema. 1973). This can be attributed to the
variation in the composition of fish among various species.
In certain species like sardines and mackerel. wide seasonal
variation in chemical composition occur within the species.
These variations affect the quality and shelflife. The
nutritional level of water. spawning, method of catching,
struggling etc. are found to have profound influence on the
condition of the fresh fish.
Soon after death the deteriorative changes in fish start
due to autolysis and bacterial growth. The rate of these
changes depends mainly on temperature. The handling methods
have great influence on bacterial contamination. Thus the type
oi'handling. temperature control. period of chill storage.
processing methods. type of freezing, condition of frozen
storage and period of storage affect the quality and shelflife
Of the fisho
In the present study extensive investigations were
carried out on various factors affecting the quality of fish
as well as their effect on the physical. chemical and sensory
qualities of fish during frozen storage and the shelflife
Description:
Central Institute Of Fisheries Technology,Cochin University Of Science And Technology
Devapiriyan, R; Dr.Parameswaran Pillai, P(Cochin University of Science and Technology, November , 1989)
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Abstract:
Existing method of culture were largely based on
empirical knowledge. Lacking a scientific basis as such methods
did, they were often wasteful and suffered severe limitation. Modern methods of fish and prawn culture based on scientific research, have revolutioned the industry in recent years and not only extended its scope to cover the whole country but led to increased fish and prawn production. An understanding of the biological capability of the water in the perennial and seasonal culture ponds, and the nature and extent of the influence of the abiotic factors on the production of organisms in the primary level of food chain would contribute to effectively implement management measures in the stocking strategies and in the evaluation of economics of production of prawns. It is against this background that the present topic of investigation "Studies on the ecology and production of algae in prawn culture systems” was selected.
Dileep, M P; Dr.Kurian, C V(Cochin University of Science and Technology, December , 1989)
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Abstract:
The main objectives of the present study has been the collection of the
larvae of some of the important and less studied demersal fishes of the South,
West Coast of India, preparation of their life history series, statistical analysis
of the morphometric characters, spatial as well as temporal distribution of the
larvae in relation to the chief hydrographic parameters such as temperature,
salinity and oxygen, so as to delineate the spawning areas and seasons of these
fish populations. The informations regarding the kind and amount of bottom fish resources along the Indian Coast are scanty. Even though the flat fish resources of Indian waters contributes a singificant share in the total marine fish landings the detailed studies on biology and fishery have been conducted only for ‘Malabar Sole‘ (Cynoglossus macrostomus) while the reminder species of this group are inadequately known. Lizard fishes (order Myctophiphormes) are always present in the miscellaneous catch in all seasons but an adequate knowledge of the potential resources of this group is wanting. The Bombay duck, coming under the same order, is one of the most heavily fished species particularly along the Maharashtra Gujarat coasts but its early developmental stages are not studied. Hence the present study will contribute to a better understanding of the demersal fishery resources of the South West Coast of India
Description:
School of Marine Sciences, Cochin University of Science and Technology
Valsalakumari, C S; Dr.Samuel, C T(Cochin University of Science And Technology, 1990)
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Abstract:
The vast areas of derelict swamps covered by macrophyton and swarmed
by insects scattered in different parts of India are at present either under
total negligence or utilized as waste disposal dumps. Eventhough Indian subcontinent
is ranked among the first ten fish producing countries in the world,
the fish production is not at par with the increasing need of protein in the
average Indian diet. So the water areas which become unusable for conventional
human activities like the swamps could be used for fish culture which would
increase the availability of protein in the form of fish flesh, thus providing
new opportunities to the fishermen. But the conversion of swamps for fish
culture would entail considerable expenditure. Hence the significance of a
group of fresh water fishes which have made their favourable abode the muddy
swamps of tropics depending partly on accessory _respiration to survive in the
inimical environment. The homeostasis achieved in such a hostile, hypoxic
medium make them excellent choices for culture in the derelict freshwater
bodies of India.
These air breathing fishes form an economically important group which
are highly esteemed as food fishes in many parts of South Asia and Africa.
Though their natural habitat seems to be the marshes, they have also conquered
other freshwater bodies like ponds, tanks, rivers and flooded paddy fields.
They can also tolerate slightly brackish waters. They are known for their nutritive,
invigorating and therapeutic qualities and are recommended by physicians
as diet during convalescence (Jhingran, 1982)
Description:
Department of Industrial Fisheries, Cochin University of Science and Technology
Asok Kumar,K; Dr.Shahul,Hameed M(Cochin University of Science & Technology, 1990)
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Abstract:
The present study of the parasitic copepods gives the taxonomic description of thirty one species of parasites collected from various elasmobranch fishes of Kerala coast. Copepods parasitic on fishes include three sub orders, viz. poecilostomatoida, cyclopoida and siphonostomatoida. Parasitic copepods of elasmobranch fishes for the present study were collected from different fish landing centres of Kerala and by undertaking regular fishing trips. The collected parasites are identified to the species level and described. It is found that out of thirty one species, fifteen are new to science. They belong to the genera viz. Nothobomolochus Vervoot, 1962, Caligus Muller, 1785, Alebion, Kroyer, 1863, Gloipotes Steenstrup and Lutken, 1861, Pandarus Leach,1819, Perissopus Steenstrup and Lutken, 1861, Echthrogaleus Steenstrup and Lutken, 1861 and Kroyeria van Beneden, 1853. Fifteen new host records were reported. Two genera viz. Echthrogaleus and Entepherus were reported for first time from Indian waters. A new genus called Penicillus was erected. The general observations made during this study revealed certain interesting aspects of host-parasite relationship, host specificity, site specificity, adaptive modifications and geographical distribution.
Description:
Department of Industrial Fisheries, Cochin University of Science and Technology
Vijay, Joshy P; Dr.Diwan, A D(Cochin University of Science and Technology, February , 1990)
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Abstract:
’l‘he reproductive physiology of the female palaemonid prawn
M. idella has been investigated by adopting a comprehensive approach
to the problem. The major aspects of the study included investigations
on breeding biology and process of oogenesis, variations in the
biochemical components in relation to maturation, neuroendocrine
relations and control over reproduction, and artificial insemination.
The prawns used in the present study were procured from
Vembanad Lake at Panavally village - a place nearly 20 km. away
from Cochin. The studies were carried out using standard histological
and biochemical methods. The modern technique of electroejaculation
was adopted for extrusion of spermatophores in artificial insemination
experiment.
Description:
Centre of Advanced Studies in Mariculture, Central Marine
Fisheries Research Institute (CMFRI)
Gopalakrishnan, K S; Dr.Kuttyamma, V J(Cochin University of Science and Technology, February , 1990)
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Abstract:
The present study involved investigation of the lethal and sublethal effects of three pesticides individually. The pesticides are the commercial formulations of DDT (organochlorine).Dime—
cron (organophosphate) and Gramoxone (paraquat dichloride).Aspects like individual toxicity, modulations in the activities of some selected enzymes, consequent to exposure to sub lethal levels of pesticides, sub lethal effects onperipheral haematology and alterations caused on the tissue architecture of brain, gills and liver, have been documented. Attempts have been made to analyse the impact of pesticides, added at realistic Levels to the experimental media, on the life and activity of Etroplus maculatus
Description:
Division of Pkuflxua Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Tehnology
Sanjeev, S; Dr.Joseph, Stephen(Cochin University of Science and Technology, February 5, 1990)
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Abstract:
In India much work has been done on different aspects of quality of
processed fish and fishery products (Pillai et al., 1965; Iyer and Chaudhuri,
1966; Iyer et al., 1966; Sreenivasan and Joseph, 1966; Pillai and Rao, 1969;
Mathen et al., 1975; Valsan et al., 1985) and standards have been formulated
for almost all the fishery products. Quality standards for fresh fish cover
only a few fish species available in the markets. For the formulation and
recommendation of quality standards for fish and fishery products for domestic
trade detailed background informations are necessary. Khot et al., (1982),
Valsan et al. J (1985) and Iyer et al. (1986) have reported on the bacterial
flora of sea foods at retail level in Bombay. Cochin is a major fish landing
centre of the south west coast of India, and an average of 25,000. tonnes
of fish/shell fish are landed annually at this harbour which is about 10 percent
of the total catch of fish in Kerala (Lakshmanan -et -al., 1984). All the
varieties of marine, brackish water and fresh water fishes are available in
Cochln throughout the year for catering to Its cosmopolitan. population and
informations regarding their bacteriological quality are scanty. Hence the
present study was undertaken to investigate the bacteriological quality of fish
and fishery products available in the markets and cold storages situated in
and around Cochin meant for internal consumption.
Description:
Central Institute of Fisheries Technology,
Cochin University of
Science and Technology
Prabhakaran, N; Dr. Sivadas, P(Cochin University of Science and Technology, April 30, 1990)
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Abstract:
Man's concern with environmental deterioration is one of the major reasons for the increased interest in marine and estuarine microbes. Microbes form an important link in the biogeochemical cycling and their cyclinq activites often determine to a large measure the potential productivity of an ecosystem In the recycling of the nutrients in the estuary,
bacteria and fungi therefore play a particularly significant role.The allochthonous plant materials contain biopolymers such as cellulose, lignin, humus etc., that are difficult to degrade into simpler substances. The fungi have the ability to degrade _substances, thereby making them available for cycling within the system. The present study is devoted to find the composition and the activity of myco populations of Cochin backwater. For convenience the thesis is divided into eight chapters. The opening chapter briefly reviews the literature and projects the importance of work and the main objectives. Second chapter discusses the materials and methods. In the third chapter the systematic and taxonomy of estuarine yeasts are examined in detail since this information is scarcely available for our waters. The general ecological aspects of the yeasts and filamentous fungi in the area of study are examined in the fourth chapter using appropriate statistical techniques. A special reference to the fungi in a small mangrove ecosystem is attempted in the fifth chapter. The biochemical studies are discussed in the sixth chapter and the penultimate chapter provides an overall discussion. In the last chapter the summary of the work is presented.
Philip,Mathew; Dr.Ravindranatha Menon,N(Cochin University of Science and Technology, August , 1990)
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Abstract:
The present scientific investigation of the effects of copper, mercury and cadmium has focussed on their effects on two commercially important marine bivalve species, Perna indica (brown mussel) and Donax incarnatus (wedge clam), conspicuous representatives of the tropical intertidal areas. The investigation centred around delineating the cause and effects of heavy metal stress, individually and in combination on these species under laboratory conditions. A clear understanding of the cause and effect can be had only if laboratory experiments are conducted employing sub-lethal concentrations of the above toxicants. Therefore, during the course of the investigation, sub-lethal concentrations of copper, mercury and cadmium were employed to assess the concentration dependent effects on survival, ventilation rate, O:N ratio and tissues. The results obtained are compared with the already available information and partitioned in sections to make a meaningful presentation.The thesis is presented in five chapters comprising INTRODUCTION, ACUTE TOXICITY, VENTILATION RATE, OXYGEN : NITROGEN RATIO and HISTOPATHOLOGY. Each chapter has been divided into various sections such as INTRODUCTION, REVIEW OF LITERATURE, MATERIAL AND METHODS, RESULTS and DISCUSSION
Description:
Head, Division of Marine Biology, Microbiology and
Biochemistry, School of Marine Sciences, Cochin University
of Science and Technology
Purandara, B K; Dr.Dora, Y L(Cochin University of Science and Technology, August 17, 1990)
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Abstract:
This thesis is an attempt to Provenence, Sedimentetion and Geochemistry of the Modern Sediments of the Mud Banks off the Central Kerela Coast, India. In the present doctoral
work, an attempt has been made to study in detail the mud banks of central Kerala, i.e. of Narakkal, Saudi and Purakkad areas which are reported as permanent mud banks, since olden days. The studies have been conducted during the years 1985 and 1986. The important findings of the study is stated as clay mineralogical studies of the rivers, lake and mud bank sediments reveal that the dominant clay mineral is kaolinite followed by montmorillonite, illite and gibbsite. Geochemical analysis of the Vembanad lake and mud bank sediments show that the iron and manganese are widely distributed both in the lake and mud bank sediments
Description:
Marine geology division, School of marine science, Cochin University of Science and Technology
Vijayakumaran,M; Dr.Ramachandran Nair,P V(Cochin University Of Science And Technology, October , 1990)
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Abstract:
Success achieved in seed production and culture of prawns induced
researchers to explore the feasibiltiy of culture of other important
crustaceans like lobsters and crabs. The CMFRI initiated a project to study
the prospects of spiny lobster’ culture and I was associated with this project
from the beginning. Compared to shrimp farming, culture of spiny lobsters
is an entirely different proposition due to inherent problems in producing
their seeds. The emphasis on .obster culture, therefore, shifted to rearing
of juvenile lobsters, which form a major portion in commercial lobster
landings in India. Commendable success was achieved in enhancing growth
rate of four important speices of spiny lobsters by bilateral eyestalk ablation.
But due to strong reservations expressed against the "blinding" of lobsters by
people from all walks of life, this technique could not be tested commercially
for its economic viability. As in prawns, energetics of reproduction and egg
development have not yet been documented in spiny lobsters and so these
aspects were included in this study. Though some limited informations on
food conversion efficiency are availble in spiny lobster, a detailed study on
the effect of size and sexual maturity on food conversion was wanting and
this also was included in this investigation. The most dominant spiny lobster in south east and south west coast of India, Panulirus homarus (Linnaeus)
was selected for this study.
Uptake, accumulation and utilization of minerals and trace elements
are important events during embryogenesis of aquatic invertebrates. The
scope of this study was widened to include these aspects also in order to
understand how specific requirements of minerals and trace elements are
met in the developing eggs of these two species of crustaceans.
Description:
Central Marine Fisheries Research Institute, Cochin
Joshi, K K; Dr.Parameswaran Pillai, P(Cochin University Of Science And Technology, November , 1990)
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Abstract:
The present work "Nature and Ecological Significance of Nutrient
Regeneration in different Prawn Culture Fields" was undertaken to understand
the seasonal variation of nutrients, nutrient cycling and primary productivity
of the prawn culture systems. The main emphasis was to find the qualitative
and quantitative estimates of distribution of total phosphorus, inorganic
phosphorus, organic phosphorus, total nitrogen and nitrogen fractions in the
water. The effect of nutrient cycling on primary productivity and concentration
of metals also form one part of the study.
The entire thesis comprise of only one major chapter with subchapters
such as, Introduction (I), Review of Literature (2), Material and
Methods (3), Results (14), Discussion (5), Executive Summary (6) and Biblio~
graphy (7)
Description:
Centre of Advanced Studies in Mariculture,Cochin University Of Science And Technology