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Monitoring and Assessing the Physico-chemical Water Properties and Planktonic Communities in Tilapia Nursing Pond

Z Ferdoushi
Professor
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

MH Rasid
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Bangladesh

ZP Patwary
Department of Aquaculture Faculty of Fisheries Hajee Mohammad Danesh Science and Technology University, Bangladesh

T.H Sarkar
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Bangladesh

MI Akter
Faculty of Fisheries Hajee Mohammad Danesh Science and Technology University, Bangladesh

Abstract/ Executive Summary:

Water samples were collected from three different size categories of tilapia nursing ponds for a period of 2 months from November to December 2016. Among different water quality parameters, only water level and temperature varied significantly. However, all the water quality parameters were found to remain within suitable ranges for tilapia fry rearing. The study revealed a total of 61 genus of plankton. Among them 49 phytoplankton genus were identified with 26 belongs to Chlorophyceae, 12 to Bacillariophyceae, 9 to Cyanophyceae and 2 to Euglenophyceae. Whereas, 12 genera of zooplankton consisting 6 genera of Rotifera, 3 to Copepoda, 2 to Cladocera and 1 to crustacean larvae. However, the planktonic communities were also pond did not vary significantly throughout the study period. Total phytoplankton covered more than 70% of the planktonic community. Chlorophyceae comprised more than 44 % in all ponds followed by bacillariophycease, cyanophycease and euglenophyceae. On the other hand, Rotifera was the dominant group among the zooplankton and varied significantly with the size and time. It can be concluded that the water quality parameters and planktonic abundance of nursery ponds are found within optimum and suitable ranges.

Keywords: Nursery pond, Tilapia, Water quality, Phytoplankton, Zooplankton

Location: In the laboratory of the Department of Fisheries Management, Faculty of Fisheries, HSTU, Dinajpur.

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Tilapia, Monitoring, Assessment

Objectives:

Therefore, a number of research works on water quality i.e. Physico-chemical parameters of water body, and ecological, limnological and biological aspects of pond is very much needed in Bangladesh for better management practices. Considering its importance the present research was designed as a case study to assess the Physico-chemical water quality parameters as well as the planktonic community in tilapia nursing ponds.

Methodology:

Three different size categories of nursery ponds were selected and considered as treatments for research purpose. Each treatment with triplicates was set for sample collection. Treatment 1 had three ponds having an area of 20 decimal considered as small size category pond, medium size category 25 decimal (Treatment 2) and rest three ponds each was 30 decimal in size were considered as Treatment 3 or large category. Samplings were conducted from November to December 2016 during the nursing time of tilapia fish. Water temperature (⁰C), transparency (cm), water level (m), pH, dissolved oxygen (mg/L) were recorded in the pond sites. Total alkalinity (mg/L), chlorophyll-a (µg/L) and plankton analysis were also determined in the laboratory of the Department of Fisheries Management, Faculty of Fisheries, HSTU, Dinajpur.

Plankton Analysis Plankton samples were collected by filtration technique. Ten liters of water samples were collected in a plastic bucket and filtered through a plankton net of 25 µm mesh size. Then concentrated sample was preserved in 4% formalin solution. Taxonomic identification up to genus level of plankton was carried out with the help of taxonomic keys from the text book of Barbar and Haworth (1981), Bellinger (1992), Pontin (1978), Lind and Brook (1980) under the binocular microscope. Then plankton abundance i.e. both phytoplankton and zooplankton were estimated or calculated by applying the following formula Rahman (1992).

Statistical Analysis: Two-way Analysis of Variance (ANOVA) is a statistical technique used to determine whether there are any differences in mean between groups or treatments. All statistical analyses were carried out using SPSS (Statistical Package for Social science) version 20.0.

Source of Information: International Journal of Fisheries and Aquatic Studies 2021; 9(1): 23-27

Article Link (Online Journal): DOI: https://doi.org/10.22271/fish.2021.v9.i1a.2383

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Through analyzing different water quality parameters, it can be concluded that the physicochemical water quality parameters and planktonic abundance in nursery ponds are found within optimum ranges. All data from the findings will help the farmer to uplift their knowledge about maintaining the proper water quality as well as to maximize the fish growth and profit. This can ultimately promote sustainable livelihoods in major areas of economic life in the small-scale tilapia farming of the northwest part of Bangladesh.

Knowledge Management: Journal