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Gears Specific Catch Per Unit Effort (cpue) with Special Reference to Declining Causes of Ichthyofauna in the Kajal River of Southern Bangladesh

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

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

Shihab Sharar Mukit
Department of Fisheries Technology, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali- 8602, Bangladesh.

Mehedi Azam
Department of Aquaculture, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali- 8602, Bangladesh

Manosh Mondal
Department of Aquaculture, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali- 8602, Bangladesh

Abstract/ Executive Summary:

The Kajal River is a coastal waterbody, having vast aquatic biota situated at Rangabali Upazila under the Southern district of Patuakhali in Bangladesh. Different types of fishing gears have been operated in the river to capture aquatic resources especially fishes which were investigated by employing participatory rural appraisal (PRA) such as focus groups (FGD), key informant interviews (KIA) with fisher’s community fishing in the river for a period of 8 months from March 2015 to October 2015. A total of fifteen fishing gears under seven major groups of the net were identified. Estimated CPUE of various gears was found highest (5-8 kg) for Current jal and lowest (0.01-.06 kg) for Moia jal. In total, forty-three (43) species were recorded belongs to eleven (11) orders, twenty-four (24) families and thirty-four (34) genera in the catches of different gears. Among the 43 species, 20, 13, 4 and 6 were to be found as available, less available, rare and very rare, respectively. A total of seven (7) vulnerable, two (2) endangered and two (2) critically endangered species were obtained out of 43 species. But these numbers are increasing day by day due to both natural and manmade causes. Therefore, necessary measures should be taken to conserve the species from near extinction.

Keywords: Conservation, CPUE, Extinction, Fishing gears, Fisheries biodiversity, Mesh size, Kajal River.

Location: Southern Bangladesh

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Commodity: Fish

Objectives:

The objectives of the study addressed to identify fishing gears with their mesh size, fishing effort, CPUE, catch per day, fisheries biodiversity, conservation status, breeding seasons and the major causes of extinction of fish fauna of the Kajal River at Patuakhali district in Bangladesh.

Methodology:

2.1 Sampling site: The present study site i.e., Kajal River, located at Rangabali Upazila under Southern district of Patuakhali in Bangladesh. The upazila falls in between 21 °46' and 22 °05'N latitudes and 91 °15' and 90 °37'E longitudes and bounded by Amtali and Galachipa upazilas on the north, the Bay of Bengal on the south, Galachipa and Char fasson upazilas on the east, Amtali upazila on the west. The sampling was carried out fortnightly i.e., twice a month for a period of 8 months from March 2015 to October 2015. 2.2 Methodology The fishing gears were surveyed based on participatory rural appraisals (PRA) such as focus group discussion (FGD), social mapping and cross-checking key informant interviews (KIA) with fisher’s community fishing in the river. The mesh size of the gears was estimated using a centimeter-scale (CRESCENT, Made in China). The fishing gears were categorized under different major groups followed by Ahmed (1971). Freshly caught unsorted samples of different gears were weighted by digital balance and pan balance to know the catch composition and finally expressed in kg. For the study of fisheries biodiversity of Kajal River 10 fishermen were hired temporarily (two from each station) and samples were collected mainly from badha jal, current jal, jagat ber jal and moia jal as well as other gear available in the present study area. Fish samples were also collected from the local fish landing centers and fish markets from previously contacted fishermen. For laboratory study, 30% of the total catch was taken in each sampling day, covering all the representatives and preserved in 10% buffered formalin solution in leveled plastic jars according to size and species. In the laboratory, the collected specimens were identified to species level with the help of standard taxonomic keys of Talwar and Jhingran 1991, Nelson 1994, Rahman 2005 and Hossain et al. 2007. 2.3 Analysis of findings For the analysis of present findings statistical analyses were carried out using Microsoft Excel 2007 and Statistical Packages for Social Sciences (SPSS) version 16.0.

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(2): 382-387

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A lack of understanding about the ecological consequences of the effects of removals of fish and the direct effects of fishing and fishing gear on community and ecosystem functions has produced questions about the sustainability of current levels of fishing. The fish of Kajal River is under threat due to excessive fishing pressure exerted from overfishing activities by the subsistence and artisanal fishermen cause destruction of habitat, feeding, spawning grounds and nursing grounds. This study is a preliminary attempt to know about different fishing gears, ichthyo species and causes of reduction of aquatic fauna of Kajal River. Therefore, fishing should be banned during breeding seasons by local authorities and the government as well as fisheries research institutions. Gears should be constructed depending on target fish species and by-catch should be avoided. Overall public awareness should be increased through a training program to conserve the ecosystem of these valuable fish species from near extinction.

Knowledge Management: Journal