Browsing by Author "Quadros, Goldin"
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Item Comparative Study Of The Abiotic And Biotic Components Of an Aquaculture Pond And Its Adjacent Thane Creek Area, Maharashtra,(2011-11) Virkar, Prakash, G.; Athalye, R.P.; Kurve, P.N.; Borkar, M.U.; Quadros, GoldinFishery of Thane creek has significantly declined due to heavy pollution. Hence fishermen grow fish in aquaculture ponds along the banks of the creek. They collect creek water in the ponds during the spring tide of monsoon when the pollutants are diluted and the water contains fishes. In the following months adding fresh water into the ponds compensates the evaporative water loss and additional fertilizers are not added. The ponds give an annual average fish yield of 600 kg/hectare (approx), when the adjacent creek area has uncertain and negligible fish yield, which makes fishing in that area uneconomical. The fishermen obtain Mugil, Tilapia, Lateus calcarifer and prawns from the pond. A comparison of the abiotic and biotic components of an aquaculture pond near Thane city and the adjacent creek area showed better dissolved oxygen and lower average salinity in the pond water than the creek. The other water parameters did not vary significantly. Among the biotic components the phytoplankton and the macrobenthos had comparable densities in both the pond and the creek. However average density of zooplankton was higher in pond and that of meiobenthos was significantly high in the creek. It is inferred that the aquaculture pond gave better fish yield than the creek, mainly due to better water quality interms of dissolved oxygen; as it did not receive, organic sewage load and there was intermittent addition of fresh water keeping the salinity moderate.Item A Non - Statistical Pollution Evaluator Index For Coastal Aquatic Ecosystems Based On Abiotic Environmental Parameters.(2011-11) Athalye, R. P; Quadros, GoldinThe present paper describes a Pollutrion Evaluator Index (PEI) for coastal aquatic ecosystems. It is based on parameters of water and sediment. For calculating the PEI, the average values of the parameters are compared with their standard limit values for unpolluted ecosystems (described by researchers) and percent variation from the limit values is calculated. Accordingly positive or negative points are given for the variation towards healthy or polluted conditions respectively. The basis of calculation of PEI method is flexible and can be suitably modified for the other dquatic ecosystems (or even the terrestrial ecosystems). The calculation is explained using the 1999-2000 data on Thane creek and the advantages and the limitations of the index are discussed.Item Occurrence of heavy metals in abiotic and biotic components of the Mangrove ecosystem of Thane creek(2011-11) Borkar, M. U.; Athalye, R. P.; Quadros, GoldinThane Creek long, 72º55 to 73ºE and Lat. 19º.00 to 19º15” N) is 26 km long creek having highly industrilized and urbanized Thane Mumbai Complex along its banks. It receives high amount of untreated domestic sewage and industrial effluent 294 mld and 145 to 260 mld respectively (TMC Report 2000). The present study was carried out during 2001-2002, to assess the heavy metals Zinc, Copper, Cadmium, Lead and Iron in different abiotic and biotic components of mangrove ecosystem of the creek. It was observed that - concentration of the metals Copper, Lead, Zinc and iron was very high in the abiotic and the biotic components while that of Cadmium were negligible, high metal concentration was observed in the crabs Illoplax gangetica a and Uca ssp., the gastropods Assiminia bervicula, Haminia crocata. Melampus signaporensis and unidentifed gastropod, the polychaetes Nereis glandicinta andan unidentified polychaete indicating the tolerance of these organisms to the heavy metals, the leaves of avicennia marina showed accumulation of zinc, while the stem samples had high concentration of iron. Compared to the past data, the concentration of metals was found to be growing in the abiotic and biotic components of Thane creek. All these observations indicate deteriorating conditions of the creek and emphasises the need to check the pollution in the creek.Item Physico- Chemical Parameters of Two Quarry Lakes, Near Thane City, Maharashtra.(Journal of Aqua.Biol Vol.19(1), 2004, 107-110, 2004) Pejaver, M.K.,; Somani, Vaishali,; Quadros, GoldinItem Qualitative Study of Fin Fish and Shell Fish Fauna of Thane Creek and Ulhas River Estuary(VPM'sB.N.Bandodkar College of Science, Thane (National Seminar), 2003-09) Rathod, S.D.; N.N., Patil; Quadros, Goldin; Athalye, R.P.