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Coastal Set Bagnet Fishery in the Payra River, Bangladesh and Its Impact on Fisheries and Biodiversity

Md. Aminul Islam
Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Md. Mahfuzul Haque
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Zoarder Faruque Ahmed
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Sultan Mahmud
Department of Aquaculture, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Ashfaqun Nahar
Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Md. Emranul Ahsan
Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Md. Moazzem Hossain
Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Abstract/ Executive Summary:

To assess the catch composition and seasonal variation in catch of set bagnet fishery from the coastal Payra river, to understand the importance and impact of set bagnet fishery on biodiversity and fisheries, and to find out feasible strategies to reduce the negative impact of set bagnet fishery. The research was conducted with selection of research area, preparation of gear survey and catch assessment form, sample collection, laboratory analysis and selection of analytical methods to achieve the objectives of the study. A total of 52 species belonging to 23 families were recorded from set bagnet in the Payra river. Most important commercial fishes and their annual catch by set bagnet in the study area were 51.03 MT Ilish (Tenualosa ilisha), 8.83 MT Rita (Rita rita), 6.92 MT Air (Sperata aor), 4.72 MT Chital (Chitala chitala), 2.03 MT Boal (Wallago attu), 1.84 MT Baghair (Bagarius bagarius), 3.35 MT Foli (Notopterus notopterus) and 13.46 MT Golda chingri (Macrobrachium rosenbergii). All these species were mostly caught at initial stages of their life cycle, which usually move with the tidal current. Study suggested that set bagnet should be restricted to allowable limit with strong monitoring system for the protection and conservation of valuable fish species in the coastal areas of Bangladesh.

Keywords: Species composition, Threatened species, Commercial species, Conservation

Location: Patuakhali District, Bangladesh

Start Date: 00-04-2013

End Date: 00-03-2014

Program Area: Conservation and Biodiversity

Commodity: Aquatic animal

Objectives:

1. To assess the catch composition and seasonal variation in catch of set bagnet fishery from the coastal Payra river

2. To understand the importance and impact of set bagnet fishery on biodiversity and fisheries

3. To find out feasible strategies to reduce the negative impact of set bagnet fishery.

Methodology:

Study area and period: The present study was carried out in the Payra river of Patuakhali District, Bangladesh. The total length of the river is approximately 45 km and width is 1-1.5 km. The river originated from the Tetulia river via the Karkhana river and finally fall into the Bay of Bengal by the name of Burishwar river. The study area was 15 km (length-wise) of the Payra river adjacent to the Dumki Upazila . The study was conducted for a period of 1 year from April 2013 to March 2014. Collection and transportation of fish samples: A large number of fishermen were involved for fishing in the Payra river. Most of the fishermen in the river depended on fishing activities by adopting numerous fishing methods and using different fishing gears. The gear survey and catch assessment for set bagnet were made monthly. A boat was hired in the survey day and fish samples were collected from the set bagnet catch on the river. Fishes were caught in the river during both day and night by using set bagnet. Freshly caught unsorted samples of set bagnet catches were collected once a month for over an entire year from April 2013 to March 2014. All samples were preserved with crushed ice in fish box and brought to the laboratory as soon as possible. Laboratory analysis: In the laboratory, ice preserved samples were washed with running tap water for removing dirt and then adhered water on the fish skin was absorbed by the tissue paper. For complete drying, fishes were finally placed in the room temperature for half an hour. Fish samples were sorted out and identified up to the species level following different books. For set bagnet catch, number of species, total weight of each specimen, and individual length of collected samples were measured. Total length of individual fish was taken in centimeter and weight was taken in gram. Estimation of catch rate and annual catch of set bagnet: Catch rate (kg/haul) and catch composition of set bagnet were analyzed separately for each month. For selected species-wise annual production estimation, monthly mean catch rates for each species were multiplied by the number of fishing days for each month, the average number of hauls per fishing day and the estimated number of fishing gears in the study area for respective month. For estimation of annual catch, from 18 to 24 March “Jatka Conservation Week 2014” was excluded from the calculation due to absence of set bagnet fishing during this period in the Payra river. Data processing, analysis and presentation: The collected data were summarized and processed for analysis. Tabular technique was applied for the analysis of data by using simple statistical tools like sums, averages and percentages etc. Finally, the processed data were transferred to a spreadsheet of Microsoft Excel, from which tables and figures were prepared for revealing the objectives of the study. Limitations of the study: No related study was previously conducted in the Payra river regarding to the present status of fisheries with the impact of several fishing gears, so that the present comparative study became difficult.

Source of Information: Journal of Coastal Life Medicine 2015; 3(4): 295-301

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Study suggested that set bagnet should be restricted to allowable limit with strong monitoring system for the protection and conservation of valuable fish species in the coastal areas of Bangladesh.

Knowledge Management: Journal