Heterotrophic bacterial populations and dehydrogenase activity in fish ponds under different fertilisation practices

Das, Madhumita and Ayyappan, S and Dash, Biswajit and Muduli, H K (2013) Heterotrophic bacterial populations and dehydrogenase activity in fish ponds under different fertilisation practices. Indian Journal of Fisheries, 60 (3). pp. 87-90.

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    Abstract

    TThe ranges of aerobic heterotrophic bacterial populations in fish culture ponds (0.04 ha) under four manurial treatments, (1) cow manure at 10 t ha-1 yr-1; urea at 100 kg N ha-1 yr-1 and single super phosphate at 50 kg P ha-1 yr-1, (2) biogas slurry at 15 t ha-1 yr-1 and inorganic fertilisers, (3) biogas slurry at 30 t ha-1 yr-1, and (4) biogas slurry at 30 t ha-1 yr-1, with supplementary feeds assessed over a period of 15 months, were 0.28-4.44,0.30-3.86, 0.48-3.81 and 0.70-4.38 x103 ml-1 with means of 1.49,1.43,1.94 and 2.08 x103 ml-1. The sediment heterotrophic bacterial counts presented a similar pattern of variation with ranges of 1.20-6.71, 1.29-4.13, 2.04-9.92 and 2.66-11.07 x105 g-1 and mean values of 3.28, 2.62, 4.87 and 5.08 x105 g-1 in the four treatments. Water temperature and water depth were in the ranges of 20.8-30.2 °C and 0.8 to 1.8 m. The ranges of different water quality parameters were pH, D.O, NH4-N, NO2-N, NO3-N, PO4-P and dissolved organic matter were 7.4-8.5, 3.5-6.1 mg l-1, 3.25-22.66, 4.63-28.95, 10.04-48.98 mg-at N l-1, 0.03-0.54 and 2.1-9.5 mg l-1. The variations in the dehydrogenase activity of the surface sediment layers, indicative of the total bacterial activity were 0.06-0.46, 0.11-0.36, 0.19-0.87 and 0.02-0.94 mg triphenyl formazone per g sediment per day with the mean levels being 0.48, 0.41, 0.28 and 0.23 mg triphenyl formazone per g sediment per day. It is apparent that the activity was higher in treatments 3 and 4. This corroborates the observations on higher heterotrophic bacterial counts in the sediments of treatments 3 and 4, attributable to availability of processed substrate as compared to the ponds with application of raw cow manure. This also suggests better sediment-water interactions in slurry-applied ponds in comparison to traditional manuring practices.

    Item Type: Article
    Uncontrolled Keywords: Dehydrogenase activity; Fish ponds; Heterotrophic bacterial populations; Organic fertilisation
    Subjects: Aquaculture
    Divisions: CMFRI-Visakhapatnam
    Depositing User: Arun Surendran
    Date Deposited: 30 Oct 2013 10:14
    Last Modified: 09 Sep 2015 15:56
    URI: http://eprints.cmfri.org.in/id/eprint/9599

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