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Theses (PG)

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2018 - 20192
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Subject: Aquatic Animal Health Management × End date: 2019 × Start date: 2018 ×
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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
    BIODIVERSITY OF MACRO-BENTHIC INFAUNA COMMUNITY IN THE INSHORE WATERS OFF MANGALURU
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, NANDINAGAR, BIDAR-585 401, 2019) KAVITHA C.,; GANGADHAR GOWDA
    Macrobenthos always play a significant role in the food web of any coastal environment. It also used as a good aquatic ecosystem health module indicator. The abundance and distributions of macrobenthos in off Mangalore were conducted in relation to hydrological parameters. The present study was conducted to know the diversity and seasonal variations of macro-benthic infauna and associated environmental factors influencing the benthic community in the inshore waters of southern Indian coast during the period of 8 months from October 2018 to May 2019 at monthly intervals. Four stations were selected along off Mangaluru coast at 4 different depth contours viz., 2 m (St. 1), 4 m (St. 2) 8 m (St. 3) and 12 m (St. 4). Altogether, 64 infaunal samples (Van-veen grab 0.1 m2) were collected which revealed the occurrence of 38 species representing five diverse groups. Polychaetes were the dominant group (50.67%), followed by Bivalves (31.34%), Gastropods (13.01%), Echinoderms (3.75%) and Miscellaneous (1.55%). Among polychaetes Capitella Capitata, Paraprionospio pinnata, Glycera alba, Nepthys spp., Nereis spp. and Cossura coasta were dominant in the coastal waters have been recorded almost at all the depths of the sampling stations. Among bivalve species Arca spp., Tellina spp., Cardium spp. and Bivalve spat were found to be dominant. From this we can conclude that these species acts as indicator or opportunistic species for monitoring of pollution in coastal environment. The highest density was recorded in May (St. 4) while the lowest was recorded in January (St. 1). It is observed that the macrobenthic population increased with increased depth and St. 4 (12m) had highest number of macrobenthos. Seasonally higher species density, was recorded during pre-monsoon season compared to post-monsoon month