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Management of Euglenophytes Bloom in Fish Pond at Rajshahi, North-west Part of Bangladesh

Mohammad Mahabubur Rahman
Department of Fisheries, University of Rajshahi, Rajshahi- 6205, Bangladesh.

Jibon Kumar Ghosh
Department of Agriculture, Shahmukhdum College, Rajshahi-6100, Bangladesh.

Mohammad Delwer Hossain
Department of Fisheries, University of Rajshahi, Rajshahi- 6205, Bangladesh.

Ananda Kumar Saha
Department of Zoology, University of Rajshahi, Rajshahi- 6205, Bangladesh.

Abstract/ Executive Summary:

An attempt was made to study the management of euglenophytes bloom in fish ponds by application of duckweed and lime. The study was carried out for five months in twelve fish ponds at Rajshahi, Bangladesh under four treatments viz., T₁ (the ponds with duckweed, Lemna sp.), T₂(The ponds with lime, CaO), T₃ (The ponds with both duckweed and lime) and T₄ (The ponds without duckweed and lime as control). The study ponds were stocked with Labeo rohita, Catla catla, Hypophthalmichthys molitrix, Puntius gonionotus and Cirrhina mrigala at 60 juveniles/dec. Water quality parameters, algal community and density, and growth performances of fish were monitored by using standard methods. The results showed that the application of duckweed and lime in the ponds had positive effects on water quality, euglenophytes density and fish growth. Better water quality, lower density of euglenophytes and higher growth of fish were recorded in T₃ as compared to other treatments (P<0.05). The present study indicates that application of duckweed and lime in combination is better for management of euglenophytes bloom in fish pond.

Keywords: Management, Euglenophytes, Bloom, Fish pond, Duckweed, Lime

Location: Mohanpur Upazila, Rajshahi.

Start Date: 00-08-2011

End Date: 00-12-2011

Program Area: Resource Development and Management

Commodity: Aquatic animal

Objectives:

1. To investigate the management of euglenophytes bloom in fish ponds by application of duckweed and lime.

Methodology:

Location and design of the study: The study was conducted in the fish ponds at Raighati, ?Mohanpur Upazila, Rajshahi, North-west part of Bangladesh for five months form August to December 2011. The study was conducted in twelve fish ponds (where the bloom of euglenophytes is developed) under four treatments viz., T₁, T₂, T₃ and T₄ (three replicates in each treatment) among which T₁ was assigned to the ponds treated with duckweed (Lemna sp.); T₂ assigned to the ponds treated with lime (CaO); T₃ assigned to the ponds treated with both duckweed and lime; and T₄ assigned to the ponds treated as control (without duckweed and lime). Pond management: Initially, all study ponds were treated with lime at the rate of 1kg/decimal. One fourth of the water surface in the ponds of T₁ and T₃ was covered with duckweed and maintained it throughout study period. Periodic liming in the ponds of T₂ and T₃ was done at the rate of 250 g/dec./15 days. The study ponds were stocked with Labeo rohita (rohu), Catla catla (catla), Hypophthalmichthys molitrix (silver carp), Puntius gonionotus (silver barb) and Cirrhina mrigala (mrigel) at the rate of 60 juveniles/dec. with the ratio of 12:7:13:18:10. Monitoring of water quality: The water quality parameters viz., water temperature, pH, dissolved oxygen (DO), nitrate-nitrogen (NO₃-N), ammoniumnitrogen (NH₄-N), phosphate-phosphorus (PO₄-P), iron (Fe), zinc (Zn), manganese (Mn) and copper (Cu) were monitored fortnightly. Water temperature, DO and pH were determined by Celsius thermometer, HACH kit (HANNA, HI-9142) and pH meter (Jenway, 3020 UK), respectively. The concentrations of NO₃-N, NH₄-N and PO₄-P were determined by using HACH kit (DR/2010). The concentrations of Fe, Zn, Mn and Cu were determined by Atomic Absorption Spectrophotometer (Model-3310). Study of planktonic algae: Water samples (15 Liters) were collected from different depth of each pond and passed through the plankton net (25 μm mesh size). The concentrated algae samples were preserved with 5% buffered formalin. Then the concentrated samples were examined using Sedgewick-Rafter counting cell (S-R cell) under a compound microscope (NOVEX). Identification of algae was performed and the enumeration of algae was done. Monitoring of fish growth: For monitoring of growth, about 10% fish from each pond were sampled and weighted monthly. The growth performance in terms of mean weight gain (MWG), average daily weight gain (ADWG) and specific growth rate (SGR) were evaluated. Statistical analysis: For the statistical analysis of collected data, one way analysis of variance (ANOVA) was performed using software SPSS (Statistical Package for Social Science, version 16.0). The mean values were compared to see the significant difference from the DMRT (Duncan Multiple Range Test). Significance was assigned at the 0.05 level.

Source of Information: International Journal of Fisheries and Aquatic Studies 2014; 1(4): 12-19

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The presents study revealed that the application of duckweed and lime in combination had a more positive bearing to improve water quality and to decrease density of euglenophytes in fish pond by reducing nutrients and heavy metals, and by increasing pH. Thus the present study concluded that the application of duckweed and lime in combination is better for managing euglenophytes bloom as well as for increasing growth of fish. Further long-term studies are necessary to study the ecological consequences of the management measures applied into euglenophytes bloom infested fish ponds.

Knowledge Management: Journal