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Theses (PG)

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20184
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End date: 2018 × Start date: 2010 × Type: Thesis × Thesis Type: M.F.Sc ×
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    ThesisItemOpen Access
    “STUDIES ON SOME BIOLOGICAL ASPECTS OF THE BLACK BANDED TREVALLY, SERIOLINA NIGROFASCIATA (RUPPELL, 1982) ALONG THE MANGALURU COAST”
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2018) KALAVATHI N.R.,; MANSING NAIK)
    The black-banded trevally, Seriolina nigrofasciata found In indo-west pacific, from eastern coast of Africa to Australia, north to southern Japan. Seriolina nigrofasciata (order: perciformes, family : Carangidae ) is a non-schooling carangid fish which occurs at the depth from 20-150 m and is commonly found in offshore reefs over the continental shelf on rocky bottom. This species is also called as “black banded king fish or butter fish” and locally called as “Neyyi meenu”. The present study is based on the observation of a total 627 individuals ranging in size from 15 to 63 cm total length (TL) comprising 280 males and 347 females. The length-weight relationship for male was W= 0.0179L2.9596 and for female W=0.0186L2.9156 . The relative condition factor (Kn) values for male and female varied from 0.9727 and 1.3307 respectively. Analysis of the gut content indicated that fish is carnivore and the diet was composed of Semi-digested matter 68.04 %, teleost 20.80 %, molluscans 16.66 %, crustaceans 3.49 %. The size at the first maturity for male and female appeared at a length of 36 cm and 39 cm TL respectively. The sex-ratio of male:female was found to be 1:1.23 in the commercial catches, showing dominance of female in the population. The Ganado-Somatic Index values ranged from 0.2149 to 2.1769 in male and in case of female, it fluctuated between 0.2342 to 3.9696. The fecundity ranged from 1,92,295 to 7,60,248 eggs with an average 5,02,906 eggs per individual . The ova diameter ranged from 0.01 to 0.5mm. The maturity stages of Seriolina nigrofasciata indicated that this species is a annual single spawner during November to febraury. Proximate composition revealed that fish muscle has 74.03 % to 83.12 % moisture, 14.58 % to 21.87 %. protein, 0.57 % to 3.66 % fat, and 0.86 % to 1.64 %. of ash.
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    ThesisItemOpen Access
    ANTHROPOGENIC INFLUENCE OF MARVOOR VENTED DAM ON HYDROBIOLOGY OF GURUPUR RIVER AND ESTUARY, MANGALORE
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2018) CHANNESH G. V; GANGADHARA GOWDA)
    Anthropogenic effects and processes influences physico-chemical characteristics of aquatic environments and biodiversity. Continuous influx of raw sewages and discharge of effluents into Gurupur river water systems lead to impair the water quality and biodiversity in the Marvoor vented dam and hydrobiology Gurpur River and estuary, Mangaluru, Dakshina Kannada, Karnataka. The present investigation was carried out for twelve months in selected stations (S1 to S7) S1, S2 & S3 in the Vented dam fresh water zone and S4, S5, S6 & S7 in brackish water zone. Study revealed that the anthropogenic activities have made impacts on water quality (Temperature pH, DO, BOD and nutrients especially Ammonia –Nitrogen; sediment (Temperature, pH, Organic matter and texture); plankton (Phytoplankton and Zooplankton); benthos and fishes. Among the water quality parameters water temperature, DO, BOD, salinity, pH and nutrients showed wide range of fluctuations in the both fresh water and estuarine water zones, due to discharge of domestic raw sewage and industrial effluents and habitat destruction due to sand excavation. Presence of dominance of species phytoplankton belong to Chlorophyceae and Chrysophyceae and zooplankton dominated by copepods followed by rotifers indicated the eutrophic environment. Further, microbiological analysis showed that water is contaminated by total and faecal coliforms. Hence, the water is not safe for human consumption. Physio-chemical parameters of water and sediment have altered the occurrence, abundance and distribution of plankton, macro benthos and fish fauna. Results indicated that entry of untreated sewage and industrial wastes have to be treated and before released into the Gurupur river estuary. The water in the vented dam is unsafe hence, water should be treated before supplied to local population in the region. The Gurupur river ecosystem should be properly managed and conserved for future needs
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    ThesisItemOpen Access
    TROPHIC INTERACTION IN COMMERCIALLY EXPLOITED DEMERSAL FINFISHES WITH EMPHASIS ON ONTOGENIC DIET SHIFTS
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2018) BHAVANJALI M.R; MRIDULA RAJESH
    Trophic interactions in seven commercially exploited marine demersal finfishes of Karnataka were studied to understand the trophic organization with an emphasis on ontogenic diet shifts and trophic overlap. In total, 4723 stomachs were examined of which 73 prey items were identified. Crustaceans and fishes formed the major prey item. Based on cluster analysis of predator feeding similarities and ontogenic diet shift within each predator, two major trophic guilds were identified. The first guild of ‘crustacean feeders’ included all size groups of Nemipterus japonicus, N. randalli, O. cuvieri and Priacanthus hamrur. The second trophic guild, ‘piscivores’, was mainly made up of larger size groups of all predators and all size groups of Saurida tumbil and S. undosquamis. The mean diet breadth and mean trophic level showed a strong correlation with ontogenic diet shift. TROPH values ranged from 3.4-4.6 for species indicating carnivorous diet pattern of the species. All the species were carnivores and the extent of carnivory increased with ontogeny. It is clear from the present study that most of the species when they were young preferred crustaceans, other invertebrates and smaller fishes but the preference changed for teleosts and other carnivores as they grew in size and age. A seasonal variation in the diet pattern observed was due to variations in prey abundance. Trophic network analysis showed maximum prey in Trophic level III and any alterations due to ecological or anthropogenic activities affecting the prey would result in alterations in community dynamics of the predators.
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    ThesisItemOpen Access
    THERMAL PROCESSING OF FISH STEAKS (PANGASIUS HYPOPHTHALMUS) IN CURRY MEDIUM USING RETORTABLE POUCHES
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2018) PATIL SHWETA MOHAN; B.MANJANAIK
    The ready to eat Fish steaks in curry (Malvani style) was prepared and packed in 3 layer (3-ply) laminated retort pouches, processed in a steam/ air mixture over pressure retort at 121 ᵒC for two different Fo values of 8.6 and 9.7 min. The time temperature data was collected during thermal processing using Ellab sterilization monitoring system (ELLAB, Denmark). The texture profiles such as hardness, springiness, gumminess, cohesiveness, and chewiness decreased as the Fo value increased. The total process time taken to reach Fo values of 8.6 and 9.7 min was 35.85 and 39.24 min respectively. Cook value and total process time found to be increased with increasing Fo value. Based on the commercial sterility, sensory evaluation and texture profile analysis, Fo value 9.7 min and cook value of 92.71 min with a total process time of 39.24 min at 121.1 ᵒC, was found satisfactory for the development of ready to eat Pangasius fish steaks curry in retort pouches.