Rajagopalan, M S; Dr.Silas, E G(Cochin University Of Science And Technology, July 18, 1992)
[+]
[-]
Abstract:
The situation in the backwaters of Kerala, which
reportedly had about 70,000 ha of mangroves, is unique in the sense that
there has been a total conversion to other uses such as paddy cultivation,
coconut plantation, aquaculture, harbour development and urban development
In order to save and restore what is left over national and international
organisations are mounting pressure on scientists and policy makers
to work out ways and means conserving and managing the mangrove
ecosystems.
In this context, it has been observed in recent years that mangrove
vegetation has remained intact in isolated pockets of undisturbed areas
in the Cochin estuarine system and also that there is resurgence of
mangroves in areas of accretion and silting. The candidate took up the
present study with a view to make an inventory of the existing mangrove
locations, the areas of resurgence, species composition, zonation and other
ecological parameters to understand their dynamism and to suggest a
mangement plan for this important coastal ecosystem
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Saramma, A V; Dr. Babu, Philip(Cochin University of Science and Technology, December , 1992)
[+]
[-]
Abstract:
This thesis Entitled Studies on amylolytic bacteria in cochin backwaters.This thesis presents a detailed account of the disribution of amylolytic bacteria in water. sediment. fishes ( Etroplus suratensis and Liza parsia) • prawns ( Penaeus indicus and Metapenaeus dobsoni) and clams ( Sunetta scripta and Meretrix casta) from Cochin backwaters. genera-wise distribution of amylolytic bacteria, ability of selected strains to grow and produce amylase at various physico-chemical conditions. Regulation of amylase synthesis anrt characters of amylases producer by these halophilic bacteria.Amylolytic bacteria are distributed widely in water. sediment. fishes. prawns and clams of Cochin back waters. 53% of the total isolates tested were capable of producing amylase. Maximum number of arnylolytic bacteria were present in Metapenaeus dobsoni. In general, the gut region of aquatic animals harboured more amylolytic bacteria than the gill or surface. These bacteria may help in the digestion of starch present in their food.Presence of ions in the medium was found to be essential for growth and amylase production. It was found that this ionic requirement is not highly specific. Sorlium chloride could be replaced by potassium chloride. or magnesium chloride to some extent I without affecting growth and amylase production. The important function of these ions may be to maintain the osmotic balance between the cells and their environment.All the isolates showed the ability to grow and produce amylase using raw-starches from cassava. plantain and potato .This property suggests their role in the rdegradation of native starches in the environment
Description:
School of Marine Sciences, Cochin
University of Science and Technology
Purushan, K.S; Dr.Sakthivel, M(Marine Products Export Development Authority, December , 1992)
[+]
[-]
Abstract:
The thesis entitled "Studies on improved practices of prawn farming for higher production in central Kerala"
prepared by the author describes various practices prevailing in the study area in order to elucidate their relative merits. The study on
semi-intensive farming at Mundapuram, Kannur was also carried out
and included in the thesis for comparison.The author felt it important to make a
critical study of the existing culture practices in the central Kerala,
a region where it has been existing since time immemorial.Careful analysis of data accrued by the author has helped
him to identify strength, weakness, opportunities and threats
confronting the shrimp farming.
As a result it was possible to evolve an appropriate
management technology taking into consideration the various ecological
(location specific), social and economical conditions prevalent in the
vast study area.
Balasubramanian, C P; Dr.Suseelan, C(Central Marine Fisheries Research Institute, 1993)
[+]
[-]
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.
Susan, Mathew; Dr.Damodaran,R(Cochin University of Science & Technology, 1993)
[+]
[-]
Abstract:
The present investigation is to find the hypoxic adaptations and role of carotenoids in the anaerobic catabolism of two intertidal bivalves-Sunetta scripta and Perna viridis. Physiological and cytological responses during hypoxic stress have been studied and compared to that of sublethal heavy metal (copper) exposure using two indices : total carotenoid concentration and accumulation of lipofuscin granules. A close similarity has been observed between hypoxic exposed and copper (sublethal) exposed animals regarding the total carotenoid concentration and lipofuscin accumulation. In the case of S.scripta, the total caroteniod increase at 48h of both hypoxic and heavy metal exposure was found to be nearly 40% greater than that of the control (0h). Whereas in P.viridis, the increment in the total carotenoid concentration at 48h of hypoxic exposure and 48h of heavy metal exposure were found to be nearly 87% and 95% higher than that of the control (0h) respectively.Regarding the lipofuscin accumulation, in both S.scripta and P.viridis , the characteristic features of the granule at 48h of hypoxia is very much similar to that observed at 48h of heavy metal exposure. Thus, the present study suggests that the increase in carotenoid concentration and lipofuscin accumulation expressed by bivalves under heavy metal stress can be due to the indirect effect of hypoxia.
Description:
Division of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin university of Science and Technology
Navas, K A; Dr.Mathew, K J(Cochin University of Science and Technology, March , 1993)
[+]
[-]
Abstract:
Coral Reefs are marine, biogenic, wave resistant carbonate structures,
formed of the skeletal remains of hermatypic, or reef building organisms.
The main reef builders are calcifying Rhodophytes, molluscs, sponges, polychaetes and Cnidarians. Among them, scleractinian corals and hydrocorallians are by far the most important contributors to the formation of reefs. Coral reefs cover approximately 600 thousand square kilometers of the earth's surface (Crossland fl a_1., 1991) which is about 2x106 square kilometres of tropical oceans.
Srinivasa, Gopal T K; Dr. Hridayanathan, C(Cochin University of Science and Technology, April 28, 1993)
[+]
[-]
Abstract:
Packaging is important not only in extending the shellife of fish and fishery products but also improving their marketability. In the recent years, significant development have taken place in the packaging industry. During the past decade in India, there is almost a packaging revolution with the availability of variety packaging materials, thus generating better packaging consciousness in other producer/manufacturing industries. But unfortunately, such realisation is not forthcoming in the fisheries sector and packaging techniques for local and export trade continues to be on traditional lines with their inherent drawbacks and limitations. Better packaging ensures improved quality and presentation of the products and ensures higher returns to the producer. Among several packaging materials used in fishery industry, ISI specifications had been formulated only for corrugated fibre board boxes for export of seafoods and froglegs. This standard was formulated before containersiation came into existance in the export of marine products. Before containerisation, the standards were stringent in view of the rough handling, transportation and storage. Two of the common defects reported in the master cartons exported from India are low mechanical strength and tendency to get wet. They are weakened by the deposits of moisture caused by temperature fluctuations during loading, unloading and other handling stages. It is necessary to rectify the above defects in packaging aquatic products and hence in the present study extensive investigations are carried out to find out the reasons for the damage of master cartons, to evolve code of practice for the packaging oi frozen shrimp for exports, development of alternative style of packaging for the shipping container, development of suitable consumer packaging materials for fish soup powder, cured dried mackeral, fish pickles in oil and frozen shrimp. For the development of suitable packaging materials, it is absolutely essential to know the properties of packaging materials, effect of different packaging materials on theirshelf life and their suitability for food contact applications.
Description:
Department
of Industrial Fisheries, Cochin University of Science and
Technology
Nasser, A K V; Dr.James, P S B R(Cochin University Of Science And Technology, July , 1993)
[+]
[-]
Abstract:
Extensive investigations on the distribution and
biology of skipjack tuna are available but less is known of the
bait fishes on which this fishery depends and what is known is
inadequate, fragmentary and of cursory nature. The information
available on tuna livebait fishes of Lakshadweep are mainly
cofined to short term surverys aimed at estimating theiravailability and abundance. Reports on the biology of a few
species from Minicoy are also present in the literature. This
study was, therefore, prompted by a paucity of information on
1) the livebits of Minicoy, 2) livebait fishery of the northern
islands and 3) knowledge of livebait ecology
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Bikash Chandra, Mohapatra; Dr.Rengarajan, K(Cochin University Of Science And Technology, August , 1993)
[+]
[-]
Abstract:
The research investigations on pollution, particularly in coastal/
estuarine environments are recent ones and started only in 1970s. Hence
the informations available are fragmentary and scattered. They throw
some light only on either the concentration of heavy metals in water
or in sediment or in organisms. No concerted efforts have been made
to consolidate and correlate the results between the environment and
biota. Literature on the level of concentration of heavy metals in different
tissues of organisms with regard to their availability in the living media,
their ratio, their inter—relationship, tolerance limit of organisms, etc. are
very few or rather nil.
in view of the importance enumerated above, the candidate has
selected the topic "Effects of some heavy metals copper, zinc and lead
on certain tissues of E E (Hamilton and Buchanan) in different
environments" for detailed studies and to understand systematically (i)
the source of effluents and wastes, (ii) the concentration of heavy metals
copper, zinc and lead in water, in sediments and in tissues of the test
animal, (iii) their effects, (iv) capacity of tolerance and accumulation
in different tissues of the animal, and (V) the "Bioaccumulation Factor",
etc.
Description:
Department Of Marine Sciences, Cochin University Of Science And Technology