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Catch Composition of Fishes by Using Different Types of Fishing Gear in Lohalia River of Bangladesh

Md. Rabiul Islam Rubel
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Jinat Jahan Bornali
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Khaleda Ferdousi
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

S.M. Rahmatullah
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Rakib Hasan
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Shaharior Hashem
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A study was conducted on the types of fishing gears used; catch assessment survey (CAS) and species composition of the Lohalia River adjacent to the sadar upazilla of Patuakhali district. Various types of fishing gears were found to operate in this river; they were broadly classified into 2 groups, such as nets and traps. A total of 8 types of nets and 2 types of traps were recorded. A total of 43 species of fish were identified in the catches of different gears used by the fishermen. Among the different types of nets, the highest number of species (28) was recorded in the catches of Behundi jal, which was followed by Ber jal (26) and relatively less number of species (5) were recorded in the catches of Sain jal. The reasons behind the fluctuation in the number of fishing gears used in the river are availability of fish. In July to October the water level of the river remains high, so the abundance of fish remains also high. Again, in this period different fish breed and different marine species also come with high tide. With the freshwater species different marine species of fish are also available in Lohalia River. Some marine species are available almost all the year round and some species come in the river during their breeding seasons, especially rainy season. Fishing by using traps is done mainly during July to September when the water level remains high. During high tide the water enter into the adjacent canals and the fishermen set the traps in the mouth of the canals. The traps are mainly used at night.

Keywords: Catch composition, Catch assessment survey, Fishing gear, Species composition

Location: Sadar upazilla, Patuakhali district

Start Date:

End Date:

Program Area: Animal Health and Management

Non-commodity: Performance

Objectives:

To study about different types of fishing gears used; catch assessment survey (CAS) and species composition of the Lohalia River adjacent to the sadar upazilla of Patuakhali district.

Methodology:

Study Area: The study was conducted for a period of eight months in the Lohalia River adjacent to the Sadar upazilla under the district Patuakhali. The study area was extended from Jainkathi Union under the sadar upazilla to Amkhola union under Galachipa upazilla of Patuakhali District. The area of study side was about 15 km long with average depth 5-6 m and wide 0.5 km. The river is an irregular shaped and in monsoon it is over flooded and affected the nearest villages. Fishermen Category: In the study area the fishermen communities were divided into two (2) distinct groups such as, professional fishermen and subsistence fishermen. Sixty (60) fishermen were selected from both professional and subsistence fishermen groups. The samples and relevant data were collected twice in month throughout the Study period. Sampling Procedure: Water samples were collected monthly at regular intervals from the Lohalia River.Measurement of Hydrographic parameters of the Lohalia 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. Temperature (⁰C): The air and water temperature were measured by a centigrade thermometer at the river site. Transparency (cm): Transparency (cm) was measured at the sampling site by Secchi disc fitted with a rod. Measurements were made up to the point of just disappearance of the Secchi disc and the depth was recorded. Current (m/sec): The current of river water was measured by a floating object. The specially designed floating object was allowed to be carried out by current and the distance covered with time was recorded. Dissolved oxygen (mg/L): Dissolved oxygen was determined by using a Hach kit (AL36B) at the river site. P^HP^H of the river water was determined by using a Hach kit (AL-36B). Salinity: Salinity of the river water was determined by using a Refractometer. Types of Gear Used in the Lohalia River: There are many types of gear used in the Lohalia River. The gears were surveyed at 6 hours intervals in each sampling day. A specially designed gear survey form was tilled-up by counting the gears. 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 same gear 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.

Source of Information: International Journal of Research in Fisheries and Aquaculture 2014; 4(4): 161-170

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present investigation, it has revealed that most of the hydrographic parameters of the Lohalia River were suitable for the habitat of fishes. But embankment erosion is a great problem for which water level; water discharge, water current, siltation etc. become unsuitable for the fishery resources of the river. The fishermen were found to follow two (2) fishing techniques viz., netting and trapping in the river. Within this fishing techniques nine (9) types of fishing gears were recorded to be used by the fishermen for fishing. Among them eight (8) were fishing nets and two (2) fishing traps. According to the information gathered so far in this study, it may be concluded that fish production in this river have declined alarmingly due to embankment erosion, indiscriminante gears used and as a whole due to absence of management policy for the open water resources of Bangladesh. In order to increase the fish production from the open water bodies some immediate action plans should be taken. For example prohibition on brood fishing, the fish fry should be released by Government, bans on the current jal fishing, bans of fishing of small undersized fishes, establishment of the fish sanctuary in certain part of the river etc.

Knowledge Management: Journal