000			03220nam a2200193Ia 4500
005			20151005141321.0
008			150525s2010xx 000 0 und d
041			_aeng
082			_a1337,T
100			_aMuhammad Sohail _97869
110			_cProf. Dr. Naureen Aziz Qureshi _96202
245			_aVariation Of The Primary And Secondary Productivity In Monoculture And Polyculture System Of Fish Pond
260			_c2010
502			_aThe present study was planned to check the primary and secondary productivity of fish ponds. The primary productivity was checked by the estimation of chlorophyll-a and abundance and diversity of phytoplankton in fish pond, the secondary productivity was studied by identifying and counting the species of zooplankton. Sample were obtained from treated and controlled ponds; in treated ponds in addition to periodic fertilization of ponds, supplementary experimental fish feed was provided but in controlled ponds only fertilizers (organic and inorganic) was applied to enrich the productivity. This study provides a comparison of the effect of fish feed on plankton productivity. Data were obtained on weekly basis during l " September to 31 November and on daily basis from I st November to is" November. The data were collected weekly for chlorophyll concentrations in fish ponds and fortnightly for phytoplankton and zooplankton abundance and diversity and were related with the physico-chemical parameter. The amount of chlorophyll a pigment and plankton abundance in treated and control pond of Catla catla, Cirrhinus mrigala and Labeo rohita was observed. It was high in pond containing Cirrhinus mrigala ranging from 2.056-4.421 IJ.g/L in pond containing Catla catla it was low (ranging from 0.313-0.768 IJ.g/L). It was observed those ponds that were treated although showed significantly higher chlorophyll-a, phytoplankton and zooplanktons but fish was keeping the biomass grazed and there were no blooms of phytoplankton were observed after the application of fertilizer. Data obtained weekly as well as every day showed a decrease in the level of chlorophyll with the time. It was high in the treated ponds compared to control pond however the decreasing trend remained same. Primary productivity as studied from chlorophyll was significantly difference in the ponds with Cirrhinus mrigala (F = 40.14**) and was non significant in ponds with Labeo rohita ( F = 2.9SNS) and Catla catla (0.75NS) when studied weekly and chlorophyll concentration values when observed daily showed Cirrhinus mrigala (F = 52.91 **) Labeo rohita ( F = 20.00**) and Catla catla (11.73*) all were significantly different and were higher in treated ponds in comparison to control ponds. The diversity indices for phytoplankton and zooplankton distribution abundance were estimated for treated and control ponds with different species of fish (Cirrhinus mrigala, Labeo rohita and Cirrhinus mrigala). Higher values of diversity (H' =), equitability (E =) and Simpson index (D= ) was observed in treated pond of Cirrhinus mrigala.
650			_aDepartment of Fisheries & Aquaculture _96203
700			_aDr. Saima _95010
700			_aMr. Noor Khan _96204
942			_cTH
999			_c3052 _d3052