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Observation on Selectivity of Fishing Gears and Ichthyofaunal Diversity in the Paira River of Southern Bangladesh

Md. Mizanur Rahman
Department of Fisheries Technology, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh.

Md. Bokthier Rahman
Department of Fisheries Technology, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh.

Mst. Nazira Akhter Rithu
Department of Geography and Environmental Studies, University of Rajshahi, Rajshahi-6205, Bangladesh.

Md. Sazedul Hoque
Department of Fisheries Technology, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh.

Abstract/ Executive Summary:

Paira River, a coastal water body of Patuakhali district having immense aquatic biota especially fishes. An attempt has been undertaken for a period of 7 months from March 2015 to September 2015 to estimate the fishing gears, their mesh size and ichthyofaunal diversity status in the Southern Bangladesh along with the globe. The study discovered total seven major types of fishing gears defined as gill nets (saine jal and current jal), lift nets (dharma jal), push net (thela jal and moiya jal), seine net (ber jal), fixed purse net (badha jal and gora jal), cast net (jhaki jal) and hook and line (chip barshi and chara barshi). A total of 57 species of fishes were identified belongs to 10 orders and 28 families of which Perciformes were of the highest occurrence (33.33%) order of the total fish population followed by 21.05%, 19.30%, 10.53%, 5.26%, and 2.51% for Cypriniformes, Siluriformes, Clupeiformes, Synbranchiformes and Beloniformes, respectively. Four orders viz., Cyprinodontiformes, Osteoglossiformes, Pleuronectiformes and Tetraodontiformes were found in the same percentage (1.75% for each) of the total number of fish species. Out of these 57 species about 8 species have to be found endangered and 3 to critically endangered in Bangladesh whereas in the globe total 4 species recorded as near threatened. Over fishing, use of restricted fishing gears and different forms of pollution are the most important factors for declining of fish diversity from the Paira River. For sustainability of these resources, an adequate knowledge of fishing gears, species composition, fish diversity and conservation status of available fish species must be understood.

Keywords: Paira River, Fishing gears, Mesh size, Conservation status, Ichthyofaunal diversity.

Location: Patuakhali district

Start Date: 00-03-2015

End Date: 00-09-2015

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To present much needed baseline data for improved and sustainable exploitation and management of the fisheries resources.

Methodology:

Study area: The study area i.e., Paira River is situated in the southern part of the geographical region known as the Patuakhali district, Bangladesh. The river originated from the Tetulia River via the Karkhana River and finally falls into the Bay of Bengal by the name of Burishwar River. Its center lies between 22º35'N latitude and 90º26'E longitude. The river also known as the Rajganj River. Total length of the river is approximately 45 kilometer and width is 1-1.5 kilometer. Data collection: The fishing gears including their mesh size, catch composition of individual gear and fish species were surveyed fortnightly from the fishermen fishing in the river. The freshly caught unsorted samples were weighted using digital balance and pan balance to know the catch composition of different gears and expressed in kg. For laboratory study, 10% of the total catch was taken and preserved in 10% buffered formalin solution in separate specimen jar marked previously according to the size of specimen. In the laboratory, the collected specimens were identified to species level with the help of standard taxonomic keys. Global conservation status and population trend were detected following IUCN; whereas following IUCN, conservation status of recorded fish in Bangladesh was used. Data processing and analysis: For the analysis of data tabular technique was applied by using simple statistical tools like averages and percentages. Processed data were transferred to a master sheet from which classified tables were prepared revealing the finding of the present study. For processing and analysis purpose computer software MS Excel was used.

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(1): 95-100, ISSN: 2347-5129

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study discovered total seven major types of fishing gears defined as gill nets (saine jal and current jal), lift nets (dharma jal), push net (thela jal and moiya jal), seine net (ber jal), fixed purse net (badha jal and gora jal), cast net (jhaki jal) and hook and line (chip barshi and chara barshi). A total of 57 species of fishes were identified belongs to 10 orders and 28 families of which Perciformes were of the highest occurrence (33.33%) order of the total fish population followed by 21.05%, 19.30%, 10.53%, 5.26%, and 2.51% for Cypriniformes, Siluriformes, Clupeiformes, Synbranchiformes and Beloniformes, respectively. Four orders viz., Cyprinodontiformes, Osteoglossiformes, Pleuronectiformes and Tetraodontiformes were found in the same percentage (1.75% for each) of the total number of fish species. Out of these 57 species about 8 species have to be found endangered and 3 to critically endangered in Bangladesh whereas in the globe total 4 species recorded as near threatened. Over fishing, use of restricted fishing gears and different forms of pollution are the most important factors for declining of fish diversity from the Paira River.

Knowledge Management: Journal