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Determination of Optimum Harvesting Time for Periphyton Production on Artificial Substrates

T. Zaman
Deputy Coordinator, Youth Training Centre, Department of Youth and Sports, Bangladesh

M. M. M. Alam
Upazila Fisheries Officer
Department of Fisheries, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted in two cement made cisterns for a four-week period. Important physico-chemical water quality parameters and harvesting time in periphyton production were studied. During the study period, four groups of phytoplankton and two groups of zooplankton were observed. Among phytoplankton, Chlorophyceae was the most dominant having 62% Chlorella followed by Bacillariophyceae having 15% Navicula and 12% Cyclotella, Cyanophyceae having 5% Oscillatoria and 2% Anabaena and Euglenophyceae having 2% Euglena and 1% Phacus. The grand averages of periphyton mass production were 0.569 (± 0.242) mg DM/cm² in C-1. There was highly significant (p<0.05) variation (F = 14.692) between C-1 and C-2 in respect of periphyton production. Cistern-1 was identified as more productive due to its favourable water quality parameters, i.e., water temperature of 24.6 to 28.3 ºC, Secchi disc reading of 18 to 33 cm, dissolved oxygen of 4.67 to 9.55 mg/L, pH of 9.12 to 10.18, NO₃-N of 3.58 to 10.90 mg/L, NH₃-N of 0.26 to 0.40 mg/L, PO4-P of 7.5 to 3.4 mg/L, conductivity 0.412 to 0.719 Ms. Third addition of substrate, that means 18- 19th day was identified as the optimum harvesting time of periphyton production.

Keywords: Periphyton, Phytoplankton, Zooplankton, Chlorophyceae

Location: Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 15-02-1999

End Date: 01-03-1999

Program Area: Animal Health and Management

Commodity: Feed

Objectives:

i) To study the role of water quality parameters on periphyton production

ii) To identify the qualitative and quantitative production of periphyton on artificial substrates

iii) To determine the optimum harvesting time for periphyton production.

Methodology:

The experiment was conducted in two cement made cisterns at the northern side of the Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh from 15th February to 14th March in 1999. Two cisterns were numbered as Cistern-1 (C-1) and Cistern-2 (C-2), respectively. The volume of the cisterns were the same, which was 3.024 m3 and rectangular in shape (9 X 6 X 2 ft). The bottoms of the cisterns were covered with 45 cm thick mud to fix the bamboo poles and also to create a natural ecosystem. About 0.8 m long several bamboo poles were fixed into the mud in such a way so that they remain in straight standing position emerging upper portions through water surface at 0.2 m apart from each bamboo pole. Cisterns were filled with water from adjacent pond. Each cistern was fertilized with 45g triple super phosphate (TSP), 80g urea and 1 kg of cow-dung, which was repeated every week during the four-week of experimental period. Water depth was maintained at 0.5 m regularly. Total 48 Perspex slides were attached with bamboo poles with the help of string in such a way so that they remained in vertical position. The slides were tagged as 1st, 2nd, 3rd and 4thweek for the convenience of observation and labeled to avoid disturbances. Statistical analysis (DMRT, ANOVA, Correlations) were performed using a statistical package called Statgraphics version 7.0 in a computer (SAMTRON-LOW Radiation) following method of Zar (1984).

Source of Information: Progress. Agric. 23(1 & 2): 51 – 62, 2012 ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Aquatic organisms, particularly plankton and periphyton, play an important role in the productivity of a water body. Fishes directly or indirectly depend upon primary and secondary producers as their source of food. Periphyton, both plants and animals attached or clinging to stems and leaves of rooted plants or on the surface projecting above the bottom, are the most important in a water body. These are very preferable food materials for many fishes. The study was conducted to determine the optimum water quality parameters and harvesting time for periphyton production on artificial substrates. During the study period four groups of phytoplankton and two groups of zooplankton were observed. Among phytoplankton Chlorophyceae was the most dominant having 62% Chlorella followed by Bacillariophyceae, Cyanophyceae and Euglenophyceae. The grand averages of periphyton mass production were 0.569 (± 0.242) mg DM/cm² in C-1. There was highly significant (P<0.05) variation (F = 14.692) between C-1 and C-2 in respect of periphyton production. According to data, Cistern-1 was identified as more productive due to its favourable water quality parameters. As it was observed, 3rd week, i.e., 18th or 19th day of the substrate addition was identified as the optimum harvesting time of periphyton production. Further studies are necessary to evaluate the economic return on periphyton production in earthen ponds.

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