Narayana Pillai, V; Dr.Murthy, A V S(Cochin University of Science And Technology, 1982)
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Abstract:
The present study is aimed at observing the variations, in
space and time, of see of the important hydrographic parameters such
as sea water temperature, salinity and Resolved oxygen within the
coastal waters along the south-west coast of Indiametween Ratnagiri
(17°OO*N,73°20'E) and cape comorin ( 8°10'N,77°30*E). Specific data
relating to the process of upwelling and sinking was collected mainly
to evaluate the extent and intensity of the vertical mixing processes
active in the area under study. The study also attempted possible correlations between the observed parameters and the occurrence and migrations of some of the major pelagic fishery resources such as sardine,mackerel and anchovy in the area under study
Description:
School of marine sciences, Cochin University of Science And Technology
Latha,Thampuran; Dr.Damodaran,R(Cochin University of Science and Technology, August 25, 1986)
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Abstract:
In India industrial pollution has become a subject of increasing concern.Incidents of industrial pollution have been reported from many parts of the country. Cochin, the collection site of the present study, being the industrial capital of Kerela is also a harbour, is vulnerable to pollution by trace metal contaminants. In the recent times, pollutants of greatest concern in the aquatic environment are those which are persistent such as toxic heavy metals and the chlorinated hydrocarbons which include insecticides and pesticides.The animals collected from the clam bed situated on the northern side af Cochin bermouth are subject to wide fluctuations in salinity both seasonal and tidal. also; salinity is considered as an important parameter influencing the.-physiological functioning of an organism. Hence, the salinity tolerance of the animal is worked out. Considering the potential vulnerability of Cochin backwaters to heavy metal pollution, the impact of heavy metal copper (II) on the bivalve Sunetta sripta was conceived. Static bioassays were conducted for the determination of the sublethal concentrations of the metal as a preliminary step towards the toxicity studies. Oxygen consumption and filtration rate which are considered as reliable sublethal toxicity indices were employed for investigating the toxic effects of the metal. Bioaccumulation, a physiological phenomenon which can be of importance from the public health point of view, and also in the assessment of environmental quality is also dealt with.
Description:
School of Marine Science, Cochin University of Science & Technology
Krishnakumar,P K; Dr.Damodaran,R(Cochin University Of Science And Technology, November 5, 1987)
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Abstract:
No serious attempt has so far been made in India to make use
of the ‘Mussel watch’ concept as a useful tool for pollution monitoring
of the marine and estuarine environment. The recently conducted
'National seminar on mussel watch’ by the Cochin University of Science
and Technology (13-14 Feb, 1986) discussed the technical aspects related
to mussel watch programme and the application of sentinel organism
concept to the coastal areas of India.
It is well known that the biological and physiological
characteristics of the organism inhabiting tropical waters such as those
prevailing in India, and the ecological as well as the environmental
characteristics of temperate areas, where mussel watch programmes are
already in existence differ greatly. So it is essential to adopt the
techniques and standards developed for temperate species to the
situations and conditions in India. In this context it is a prerequisite
to collect information on physiology and other biological indices of
stress of possible sentinel organisms like P.viridis.
In consideration of the above, P. viridis which is a potential
sentinel organism, is selected for the present study
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
Aneeshkumar, N; Dr.Sujatha, C H(Cochin University of Science and Technology, October , 2009)
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Abstract:
We are in the cutting edge of a new era of development without leaving
any promises to next generation. But the scale and size of the problem are only
partially blamed. The juggernaut of Globalisation has trampled upon whatever
little hope we might have had making a quick transition to a less energy –
intensive world. “Environment friendliness begins at home”. Our quest for
productivity and profitability should progress simultaneous with our
cooperative responsibility of leaving behind a clean and green earth for the
generation to come. Climate change is the most pressing global environmental
challenge being faced by humanity, with the quest for better productivity for our
fragile ecosystem. It is too late to rely solely on reduction in Green house gas
emissions to mitigate climate change although this is undoubtedly crucial.
Coastal belts are more prone to these devastating impacts and its protection is an
intensive filed of research. The present study describes how the colourful
Carotenoids and Chlorophylls can be used in rapid hand on tool in conjunction
with molecular biology to open sources and it also explores the fate of organic
matter in the aquatic system and underlying sediments.
Description:
Department of Chemical Oceanography,
Cochin University of Science and Technology
Sreedevi, M G; Dr. Balchand, A N(Cochin University of Science and Technology, February , 2007)
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Abstract:
This thesis attempts to gain insight on the mathematical approach to estuarine
oceanographic systems; also to closely understand the governing processes in the
estuarine environment as well as in the adjoining river reaches.
The main aim was to conduct pollution routing for tropical estuarine environment
namely, for the Cochin estuary. In this context, attempts have been made to apply,
verify and validate the application of models, pre- prepared with necessary
modifications to suit the area of interest by use of RIVMIX and WASP tools.
Finally the thesis concludes by highlighting the advantages and limitations in
modelling water bodies and concurrentlysimulates most of the possible scenarios
within the purview of this work.
Description:
Department of Physical Oceanography,
Cochin University of Science and Technology
Latha Unnikrishnan; Devadasan,K(Central Institute of Fisheries Technology, 2006)
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Abstract:
Polycyclic Aromatic Hydrocarbons and other toxic compounds from industrial effluents are noted for their high potency for skin, lung, bladder and gastrointestinal cancers. Increased industrialization, and population growth led to greater production of wastes, Pesticides and PAHs have received attention due to their carcinogenic effects. The main objectives of the study were; to collect base line data on the concentration of PAHs in seawater and sediment from the west coast of India, the concentration of PAHs in certain species of fishes, the comparative levels of PAHs in fish, the influence of sediment characteristics on the concentration of PAH in sediment, changes in PAH concentration in water, sediment and fish, to provide a base line concentration of trace metals in water, sediment and fish, the seasonal changes in content of selected trace metals in water, sediment and fish from the west coast of India. The present study revealed that a predominance of silt and clay at all stations in the off Cochin area. The study has provided comprehensive information available to date for PAHs in seawater, sediment and fishes from the west cost of India especially from the Quilon to Mangalore region.
Joselet Mathew; Dr.Kulasekarapandian, S(Cochin University Of Science And Technology, November 6, 1990)
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Abstract:
This thesis deals with the population characteristics of Artemia
and the effect of different environmental parameters on the different
stages of Artemia in a salina at Tuticorin, south east coast of India.
The present investigation was carried out from 1985 to I987.
The study was initiated by undertaking a survey to find out suitable
Artemia habitats along the south east coast of India and a perennial
salina with an area of 0.25 ha was selected at Karapad (Tuticorin). Weekly
samplings were made for two full calender years (1986-87) to collect
the different stages of Artemia population as well as the different
environmental parameters. The thesis comprises of the following sections: Introduction, materials and methods, systematics, biology and distribution of Artemia, results and discussion, summary and bibliography. The section on results
and discussion gives the characteristics of Artemia population in the
salina, the seasonal variations of different environmental parameters
in the salina and their effects on different stages of Artemia population.
Description of an experiment conducted to show the sudden changes of
salinity on different stages of Artemia is also given as a separate
section.
Description:
Centre Of Advanced Studies In Mariculture,Cochin University Of Science And Technology
Manju, Sebastine; Pillai, N G K(Cochin University Of Science And Technology, October 23, 2014)
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Abstract:
Globally most of the conventional fish stocks have reached a state of optimum exploitation or even over-exploitation; efficient utilization of non-conventional resources is necessary to meet the supply-demand gap for protein supply. Mesopelagic fishes can be considered as one such promising resource for the future, if appropriate harvest and post-harvest technologies are developed. Increasing human population and increasing demand for cheaper food fishes has made myctophids a possible potential resource for future exploitation and utilization. Earlier studies indicated the abundance of Diaphus spp. in the eastern and northeastern Arabian Sea. The present study also indicates the dominance of Diaphus spp. in the deep sea trawling grounds of south west coast of India. Commercial viability of the myctophid fishing in the Indian waters has to be worked out. The present catch estimation is based on the Stratified Random Sampling Method from the landing data. As the coverage of sampling area was limited and the gear efficiency was not standardized, the data generated are not precise. A counter check for the estimates is also not possible due to the absence of comparable works in the study area. Fish biomass estimation by acoustics survey coupled with direct fishing would only confirm the accuracy of estimates. Exploratory surveys for new fishing areas to be continued, for gathering the distribution, abundance, biological and ecological data and map the potential fishing ground on a GIS platform and the data should be provided to the commercial entrepreneurs. Generally non-conventional and non-targeted resources are under low fishing pressure and exploitation rates. Low values of fishing mortality and exploitation rates indicate that removal from the stock by fishing was only nominal from the present fishing grounds. The results indicate that the stock is almost at virgin state and remains grossly underexploited. Since the extent of distribution and abundance of the stock in the ecosystem remains to be ascertained, sustainable yield could not be estimated. Also the impact of myctophids harvest, on other commercially important fishes, has to be studied.
Harikrishnan, M; Dr.Madhusoodana,Kurup B(Cochin University Of Science And Technology, September , 1997)
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Abstract:
Macrobrachium rosenbergii (de Man) and M.ide77a
(Hilgendorf) form two commercially important Palaemonid
prawns of the Vembanad lake (9 28' and 10 10’ N and 76
13' and 76 31' E). Both of them were known to have
contributed to a very lucrative fishery during the sixties,
however, in recent years these natural resources have badly
depleted owing to the impact of many man made alterations
brought about in the ecosystem such as habitat reduction,
physical obstruction imposed in the migratory pathway of
these species, pollution hazards, etc,. Changed
environmental conditions and increased fishing pressures
caused persistent alterations in the stock size of these
prawns during the past so many years, however, no serious
attempt was made to monitor the stock size from time to time
and also to bring out the resource characteristics. Though,
the morphotypic differentiation in grow out male population
of M.rosenbergii has been documented, no similar studies
were conducted with regard to natural male and female
population. Based on the data collected during fishery
cruise surveys conducted in Vembanad lake from March '94 to
February '96, population characteristics. postlarval
distribution, fishery and population dynamics of
M.rosenbergii and M.ide77a of the lake were studied in
detail.
Description:
School of
Industrial Fisheries, Cochin University of Science and Technology
Abdussamad, E M; Dr.Gopinatha Menon, N(Cochin University of Science and Technology, June , 2001)
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Abstract:
present work deals with the various aspects of population characteristics of penaeus indicus ,Metapenaeus dobsoni and metapenaeus monoceros during their nursery phase in tidal ponds and adjacent backwaters.Importance of the present study is to suggest scientific basis for the management of penaeid resources in tidal ponds and backwaters based on their biological characteristics to ensure better yield.Seasonal closure of fishing will be effective in improving the size of the shrimp at harvest.Hydrology of tidal ponds varied with location, but showed a common seasonal pattem.Seasonal variation in temperature was very small. It fluctuated between 27.5 to 32.3°C in tidalponds and 26.9 to 29.9°C in open backwaters.Improvement of nursery habitats with due consideration for biological requirements of the resource will ensure better growth, survival and abundance of the stock.The recruitment, growth and emigration data of prawns from their nurseries can be used successfully for fishery forecasting. projecting juvenile growth forward through time, it is possible to establish, which cohort contributes to offshore fishery each year. So, by interpreting the recruitment and growth data of species in their nurseries with offshore catch data, fishery can be forecasted successfully.
Description:
Central Marine Fisheries Research Institute, Kochi