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Theses (Ph.D.)
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ThesisItem Open Access Ecology of Haladi-Chakra Estuarine Complex, Coondapur, Karnataka(Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar, 2007-08-12) Vikas, S.J.; Reddy, H.R.V; Katti, R.J.; Shivaprakash, S.M.; Ramesh, K.S.; Krishna Bhatt, C.H.An investigation was carried out from January to December 2005 in Haladi-Chakra estuarine complex, Coondapur to understand the spatial and temporal variation in the physico-chemical characteristics of water and sediment features and also to know the abundance and distribution of phytoplankton, zooplankton, fish and macrobenthos. Monthly samplings were carried out at 5 selected stations, two stations in Haladi estuary (station 2 and 3) and two stations in Chakra estuary (station 4 and 5) and one located at the confluenceThesisItem Open Access Influence of Environmental Factors on the Oyster Beds of Mulky Estuary, South West Coast of India(Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar, 2013-01-19) Ganapathi Naik, M.; Gangadhar gowda; Benakappa, S.; Iqlas Ahmed; Ramachandra Naik, A.T.; Krishna Bhatt, C.H.A survey has been carried out to assess the distribution of oyster beds in the Mulky estuary to inventory the number of oyster beds suitable for oyster exploitation and culture. There were total 25 oyster beds ranging from 49.17 to 18528.01 m² area. The total area of the oyster beds in the Mulky estuary is 53,488.01 m². Among 25 oyster beds, 19 oyster beds are productive. For the first time, the present investigation reported C. gryphoides in Mulky estuary. It was found that S. cucullata formed beds in the Mulky estuary suitable for exploitation. During the present study, instances of infestation of C. madrasensis by the pea crab Pinnotheres spp. were observed. In the Mulky estuary, oyster spat fall is continuous round the year except for the monsoon months. The spat fall rate was found more on concave surface of the oyster shells than that of the convex surface. It was found that the most suitable period for the peak collection of oyster spats in the Mulky estuary is during December to January and April to May of the year. Therefore, oyster farmers can set their cultch materials during this period to collect maximum spats for culture practices. It was found that in the Mulky estuary, oysters could be transplanted from oyster beds to non oyster bed areas to enhance wild stock of oysters that in turn beneficial for fishermen for commercial harvesting. Since, oyster populations contribute to maintain the water quality through filtering the water, the enhanced oyster population through transplantation may also contribute in maintaining the water quality of Mulky estuary.