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Fisheries in Payra River with Special Emphasis on Set Bagnet

MD. AMINUL ISLAM
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Fisheries in Payra river with special emphasis on set bagnet were studied during April 2013 to March 2014. The Payra river is a perfect expanse for breeding, feeding and nursery grounds of many fish species. A total 70 species of fish and 11 types of gears were recorded from 15 km stretch of the river. Among the total number of species found in the Payra river, 13 species were most common, 28 species were common, 19 species were less common and 10 species were rare. Different fishing gears were found to have impact on the abundance of fishes at different levels. Set bagnet was found as a common type of fishing gear being operated to catch fish in the Payra river. In the study area, a total 52 species of fish belonging to 23 families were recorded from the set bagnet catches. The estimated annual catch of these species was 614.54 MT numbering about 128 million of fishes including juveniles of many valuable fish stocks. Among the total catch of set bagnet, 16 threatened species were also identified including 6 vulnerable, 6 endangered and 4 critically endangered species. Most important commercial fishes and their annual catch in set bagnet 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 juvenile stage, that usually move with tidal current. If these species were stopped catching at juvenile stage, and allowed them to grow to adult, the expected production would be approximately 5953.788 MT Ilish, 1306.697 MT Rita, 1218.207 MT Air, 855.784 MT Chital, 556.529 MT Boal, 362.109 MT Baghair, 42.109 MT Foli and 859.217 MT Golda chingri (considering 30% mortality from juvenile to become adult) from the studied area of the Payra river. The present study suggested that the operation of fishing gears which have harmful impact on fisheries resources need to be decreased and should be restricted to allowable limit for the protection and conservation of the valuable fish species in the Payra river. For a better tomorrow, we must keep a strong monitoring system for sustainable management of set bagnet. Sustainable management is not only about restriction on fishing for economic purposes, it has also a great concern to save fish diversity.

Keywords: Payra river, Set bagnet, Bangladesh

Location: Patuakhali district.

Start Date: 00-04-2013

End Date: 00-03-2014

Program Area: Resource Development and Management

Commodity: Aquatic animal

Objectives:

To know the present status of biodiversity and fisheries in the Payra river;
To assess the catch composition and seasonal variation in catch of set bagnet fishery in the study area;
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.

Methodology:

Study area and period: The present study was carried out in the Payra river of Patuakhali district. The total length of the river is approximately 45 kilometer and width is 1-1.4 kilometer. It is bordered by Dumki, Bakerganj and Mirzaganj upazilla. 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 upazilla. The study was conducted for a period of 1 year from April 2013 to March 2014. Gear survey and catch assessment: A large number of fishermen are involved for fishing in the Payra river. Most of the fishermen in the river depend on fishing activities by adopting numerous fishing methods and using different fishing gears. The gear survey and catch assessment were made monthly to know the fish biodiversity and fisheries in the Payra river. A boat was hired in the survey day and information was collected from the fishermen on the river. Different types of fishermen using different gears were selected for collecting information. . For catch composition analysis, the diverse species captured by different gears were identified. When there was some confusion to identify species, those fishes were transpoted to the laboratory for accurate identification. Collection and transportation of fish samples: For set bagnet, fish samples were collected from the study area of Payra river under Patuakhali District. Fishes are 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. Collection of data: During the collection of data, information on the background, biodiversity and seasonal variation of fisheries in the Payra river were collected from fishermen, local people and fish traders by the researcher himself. Major source of data were collected from gear survey form and catch assessment form. For set bagnet, data were collected from selected fish samples and their laboratory measurement as identification of species, number of fishes for each species, and length and weight of species. The data including previous scientific study on aquatic biodiversity and fisheries were collected from several books, journals and thesis. 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 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. For data processing and analysis purpose, MS Excel and MS Word have been used. Different tables and graphs have been used for data presentation.

Source of Information: MS Thesis, Roll No. 13 FM JJ 03 M, Registration No.: 40864 Session: 2013-2014, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A total 70 species of fish and 11 types of gears were recorded from 15 km stretch of the river. Among the total number of species found in the Payra river, 13 species were most common, 28 species were common, 19 species were less common and 10 species were rare. Different fishing gears were found to have impact on the abundance of fishes at different levels. Set bagnet was found as a common type of fishing gear being operated to catch fish in the Payra river. In the study area, a total 52 species of fish belonging to 23 families were recorded from the set bagnet catches. The estimated annual catch of these species was 614.54 MT numbering about 128 million of fishes including juveniles of many valuable fish stocks. Among the total catch of set bagnet, 16 threatened species were also identified including 6 vulnerable, 6 endangered and 4 critically endangered species. Most important commercial fishes and their annual catch in set bagnet 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 juvenile stage, that usually move with tidal current. If these species were stopped catching at juvenile stage, and allowed them to grow to adult, the expected production would be approximately 5953.788 MT Ilish, 1306.697 MT Rita, 1218.207 MT Air, 855.784 MT Chital, 556.529 MT Boal, 362.109 MT Baghair, 42.109 MT Foli and 859.217 MT Golda chingri (considering 30% mortality from juvenile to become adult) from the studied area of the Payra river. The present study suggested that the operation of fishing gears which have harmful impact on fisheries resources need to be decreased and should be restricted to allowable limit for the protection and conservation of the valuable fish species in the Payra river.

Knowledge Management: Thesis