Browsing by Author "Kurve, P.N."

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    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, Goldin
    Fishery 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.
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    Toxic Effects (By Lc50 Analysis) Of Endosulfan On Cyclopoid Copepod, Mesocyclops leuckarti (Claus,1857)
    (2012-01) Kurve, P.N.; Kulkarni, G.V.
    Spraying of various pesticides for controlling pests has been a very common affair in agricultural practice. As the pests develop resistance to the pesticides, use of stronger pestcides become inevitable. These pesticides accumulate in the environment and cause serious hazards to biosphere. The present study was carried to elaborate the toxic effect of one such pesticide (Endosulfan) on the fresh water. Mesocyclops leuckarti (Claus, 1857) was selected as a model for studying the effects of Endosulfan. Endosulfanis known as a highly efficient pesticide. At the same time details discussed in the following paper will prove that its effects on the aquatic microfauna are also significantly toxic, LC50 studies of the same have indicated that even minute doses like 0.01 ppm were lethal. For M.leuckarti when exposure time was 96 hours. The forthcoming paper details LC50 values of this pesticide for different periods of exposure.