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Seasonality of Physicochemical Parameters and Fin Fish Diversity at Hakaluki Haor (fenchungonj Upazilla), Sylhet, Bangladesh

Mohammad Amzad Hossain
Department of Fish Biology and Genetics, Faculty of Fisheries, Sylhet Agricultural University, Sylhet-3100, BANGLADESH

Ahmad Fazley Rabby
Bangladesh Fisheries Research Institute, Marine Fisheries & Technology Station, Cox’s Bazar, BANGLADESH

Abstract/ Executive Summary:

A one-year-long field survey had been conducted to investigate the seasonal fluctuations in the water quality properties and fin fish diversity at Hakaluki Haor, Bangladesh. Different water quality parameters and fish catchment data were taken from each site on monthly basis. Fish were identified on a family basis through surveying in fish landing centre, fish markets and fisher’s community and samples were brought to the laboratory for accurate taxonomic identification. Temperature, turbidity and pH were found to be different depending on the season; while, dissolved O2 and NH3 were moderately uniform in all seasons. Almost twenty taxonomic families have been identified. Among them, the Cyprinidade family was the most abundant family (34%), following Bagridae (8%), Siluridae (6%); while, the Mugilidae (1%) was the least abundant one. The highest and lowest value in the majority of diversity indices were observed in monsoon and winter, respectively. The Pearson correlation test was conducted to evaluate the regression coefficient between different water quality parameters and diversity indices.

Keywords: Seasonality, Fin Fish, Diversity indices, Water quality parameters, Hakaluki Haor

Location: Sylhet, Bangladesh

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Commodity: Fish

Objectives:

Current research includes both analyses of seasonal variation in the water quality along with the fluctuation in different diversity indices of freshwater fish species at Hakaluki Haor (Fenchungonj Upazilla), Sylhet, Bangladesh.

Methodology:

Study Site and Duration: The study area includes the haor portion located in Fenchugonj. It carries importance due to the conjunction of the nearby Kushiyara River and easy transportation facility with markets and other cities. The sampling sites constitute series of the flood plain and wetland water systems, where water from both conjunction river and hilly freshwater runoff constitutes the major water source during the rainy season. Also, the freshwater runoff from nearby hills and cities caries a significant amount of nutrient and anthropogenic pollution. Water Quality Sampling and Diversity Data AcquisitionThe seasonality pattern followed in the current study were described by Iqbal et al. (2015), which refers from December to February as winter, from March to May as pre-monsoon, from June to August as monsoon/ rainy season, from September to November as the post-monsoon season. Water quality data i.e., water temperature, turbidity, pH, dissolved O2 and NH3 have been conducted using YSI multiprobe meter on-site, and catch per unit effort data were collected by direct interview with fishermen on-site or landing center. A preset questionnaire was prepared to draw diversity data from fishermen, local artisanal fishers, and community stockholders through voluntary interviews. All the interviews, data acquisition processes and water quality recordings have been done monthly and inputted as season-based. Fish were identified on a family basis and some species that were difficult in identifying on spot have been brought to the laboratory for further taxonomic confirmation. Tools of Diversity Analysis Shannon-Weaver diversity index (H’)=Sum [pi x log(pi)] (Shannon, 1948), Where, H’=Shannon-Weaver index, Pi=ni/N, (ni=no. of individuals of a species, N=Total number of individuals) Pielou’s evenness index (J’) =H(s)/H(max) (Pielou, 1966), Where, H(s)=the Shannon-Weaver information function, H(max)=the theoretical maximum value for H(s) if all species in the sample were equally abundant.Margalef species richness (d)=(S-1)/log(N) (Farris, 1976); Where, S=numbers of available species, N=total numbers of individuals. Simpson dominance index (c)=Sum(ni/N)2 (Simpson, 1949); Where, ni=number of individuals in the ‘each’ species, N=total number of individuals, S = total number of species.The catch per unit effort CPUE (g/h or n/h)= (TSGCB or TSGCN)/TSEH, (Ghosh & Biswas, 2017); Where total sampling effort hours (TSEH)=SEHPD (sampling effort hours/day/gear)xSGD (sampling gear density), g=gram, n=number, h=hour. Statistical analysis: Raw data has been recorded on an excel sheet, descriptive data were treated before further analysis. Data were analyzed and graphs were produced by using IBM SPSS Statistics version 26.

Source of Information: Marine and Life Sciences, 2(2): 113-119

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

To be concluded, current investigations show very little changes in the water quality parameters following the seasonal trends, except temperature and turbidity. Diversity indices were less depending upon the described water quality parameters, however, seasonal trends were moderately observed in diversity indices and catch per unit efforts. Overexploitation is one of the major causes for reduced biodiversity measurement, which demands better management and conservation approach for haor-based fisheries in the suggested area.

Knowledge Management: Journal