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A Study on the Catch Composition of Set Bag Net Used in the Ramnabad River, Patuakhali

MD. RAKIB HASAN
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A field study was conducted on the set bag net (Behundi jal) fishery and species composition of set bag net in the Ramnabad River adjacent to the Galachipa upazilla of Patuakhali district. The study was conducted for a period of eight months from July-2012 to February-2013. A total of twelve fishes and shellfishes such as Poa (Otolithoides pama), Tengra (Mystus vittatus), Ilish (Tenualosa ilisha), Chewya (Taenioides cirratus), Golda chingri (Macrobrachium rosenbergii), Ramsos (Thryssa purava), Horina chingri (Metapenaeus monoceros), Kajli (Ailia coila), Chapila (Gudusia chapra), Motka chingri (Macrobrachium malcomsonii), Dogri (Trypauchen vagina), Boiragi were identified in the catches of set bag net used by the fishermen during the study period. Among that species Chewya and Horina chingri were the dominant fishes. The Chewya was dominant in winter season when salinity was high. Horina chingri was dominant in rainy season when water current increased. The other fishes were found a little amount but not significant and had no relation with salinity and current. Salinity and water current was the main factors for the variation of total catch and availability of fish. In July to October the water level of the river remained high, so the abundance and availability of fish was high. For fishing fishermen used set bag net from July to February when the water level was high in rainy season and salinity was high in winter season. During high tide the water entered into the adjacent estuary and the fishermen used set bag net in the mouth of the estuary.

Keywords: Catch composition, Set bag net, Ramnabad river, Patuakhali

Location: Galachipa upazila, Patuakhali district

Start Date: 00-07-2012

End Date: 00-02-2013

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To undertake a catch assessment and species composition of the Ramnabad River by set bag net, and
To know the effect of hydrographic parameters on catch composition.

Methodology:

The credibility of the result of a scientific research depends to a great extent on the appropriate methodology used in the research. So, great care was taken in following a scientific and logical methodology for carrying out this research. Study Area: Selection of the study areas is an important step for conducting research because it indicates a premise from where required data would be collected in accordance with the objectives set for the study. The study area was selected in the Ramnabad River adjacent to the Galachipa upazila under the district Patuakhali. The total length of Ramnabad River was approximately 25 kilometers and width was 3.5 kilometers. It was surrounded by Rangabali, Galachipa and Kolapara upazila. It was the branch of Tetulia River. Local names of the areas from where data were collected were Panpotti lanch ghat, Koralia, Moudubi, and 12 no. degree. Fishermen Category: Samples of fishermen were randomly selected in order to meet the objectives of the study. In this study, total 30 set bag net (SBN) fishermen were randomly selected from the villages surrounding the river. Fishermen were categorized into six groups on the basis of fishing gear which were used by them. The samples and relevant data were collected twice a month throughout the Study period. Study period: The study was conducted for a period of 8 (eight) months from July-2012 to February-2013, in the Ramnabad River adjacent to the Galachipa upazila under the district Patuakhali. Collection of data: During collection of data, primary source was considered. Data were collected from fishermen by the researcher himself several visits were made to the study area to collect accurate information related to objectives of the study. The information also collected from Galachipa sadar Upazila Fisheries Office, District Fisheries Office, Patuakhali, LGED at Patuakhali District. Data processing, Analysis and Presentation: The collected data were summarized and processed for analysis. These data were verified to eliminate all possible errors and inconsistencies. Tabular technique was applied for the analysis of data by using simple statistical tools like averages and percentages. Finally, the processed data were transferred to a master sheet from which classified tables were prepared revealing the finding of the study. For processing and analysis purpose, MS Excel and MS word have been used. Tables, pie-charts etc. had been used for data processing and analysis. Catch Assessment Survey (CAS): Sampling of catches and their assessment were done twice per month during the study period. The fishermen were selected on the basis of types of gear they operate. The total catches were weighed by a balance and the representative samples were taken with the help of hand without repetition of the net in each sampling day. The collected fishes were sorted species- wise and the numbers of individuals for each species were counted and then their percent composition was determined. Measurement of Hydrographic parameters of the Ramnabad River: Air and water temperature (0C), transparency (cm), current speed of water flow (m/sec), dissolved oxygen (mg/L) and pH were measured at the river site in the study. The samples and relevant data were collected twice a month throughout the Study period.

Source of Information: MS Thesis, Roll No. 12 Fish Aqua JD 05 M, Registration No.: 39701 Session: 2012-13, Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A total of twelve species of fishes and shellfishes were recorded in the catches of set bag net during the study period. Chewya and Horina chingri was the most dominant species. The other species was insignificant in quantity. Tough chewya and Horina chingri was the highest catch so set bag net was mainly used for chewya and horina chingri fishery. In the present investigation, it has revealed that most of the hydrographic parameters of the Ramnabad River were suitable for the habitat of fishes and other aquatic fauna. But during rainy season, soil erosion and heavy rainfall became a great problem for fish habitat. At that time hydrographic parameters changed frequently. The SBN was being used along the entire coast of Bangladesh with heavy concentration in some areas. It is most usable net in Ramnabad region. But some fisherman using extra fine nets, bank to bank netting and illegal catching of brood fish and fish fry have serious adverse effect on these fishery resources. A number of traditional and recently introduced fishing gear are used for harvesting fry of large number of commercially valuable species.

Knowledge Management: Thesis