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Information × Registration Number 0206U005720, 0106U005213 , R & D reports Title Transformation of allochthonic and autochthonic nitrogen in fish cultivation systems and its effect on reproduction of fishes. popup.stage_title Head Romanenko Viktor Dmitrievich, Registration Date 05-05-2006 Organization Institute of Hydrobiology of National Akademy of Sciences of Ukraune popup.description2 Decreasing of concentration of terrigenous-origin mineral nitrogen (ammonium ions especially) in investigated ponds cascade was determined by both dilution and assimilation by phytoplankton, higher aquatic plants and microorganisms. Bacterioplankton distribution directly correlated with ammonium nitrogen gradient. Water and bottom sediment samples of upper ponds were highly toxic to test-organisms (daphnia, guppy) and exhibited genotoxic effect on apical meristem of onion bulb roots. Intake of nitrogen compounds into fish-breeding pools leaded to indirect (owing to activation of autotrophic chain of ecosystem) benefit effect on formation and growth of reproduction organs and higher indexes of linear and weight growth. Adaptation to increased nitrogen concentration is directed to accumulation and utilization of macroergic compounds toward glycogen formation affecting biosynthetic processes in autumn period. It is manifested as well by increasing of spleen and decreasing of liver indexes giving evidenceof macroergic compounds deficiency. Adverse effect of exceeding concentrations of nitrogen compounds (ten times as large as MPC) show itself especially in winter period in abrupt decreasing body weight and survival. Product Description popup.authors popup.nrat_date 2020-04-02 Close