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Ichthyofaunal Diversity of Basurabad Beel in Regards with Threat Factors and Conservation Measures, Bangladesh

Md. Arifur Rahman
Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Birinchi Mandal
Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Amit Khamari
Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Md. Rahamat Ullah
Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

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

Md. Abubakkor Siddik
Department of Land Record and Transformation, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Suprakash Chakma
Department of Fisheries Technology, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Abstract/ Executive Summary:

The present study was conducted to assess the temporal distribution of ichthyofaunal composition of Basurabad beel in Khulna, Bangladesh and investigated the fish biodiversity and core threats to biodiversity to provide recommendations for conservation in the beel. During the study period, total 33 fish species were recorded belonging to 6 orders. The order wise fish species availability was maximum in Perciformes (39.40%) and minimum in Beloniformis (3%). The value of Shannon-Weaver diversity index was found higher in Fultola (1.19±0.41) and lowest in Basurabad (0.68±0.17) while the maximum value of Margalef richness index found in Basurabad (1.12±0.35) and lowest in Debitola (0.68±0.34). The value of Pielou’s evenness index was higher in Boroitola (0.61±0.20) and lowest in Basurabad (0.31±0.16) however the Pielou’s index showed an uneven distribution of fish species in the Basurabad sampling point. The value of Simpson dominance index was higher in Fultola (0.58±0.10) and lowest in Kishmath-Fultola (0.39±0.16). Ten different kinds of fishing gears were identified under 5 ma- jor groups in the beel. Among all the gears operated, seine net (Jagat Ber Jal) had the highest catch 31.3±4.1 CC/haul/day/gear (kg) followed by current jal 10.5±2.5 CC/haul/day/gear (kg). This study suggests that comprehensive studies on fisheries biology including reproductive biology, growth, stock assessment and their association with existing laws are essential for the sustainable management and conservation of fish species in the Basurabad beel.

Keywords: Basurabad beel, Biodiversity, Exotic species, Ichthyofaunal diversity, Pollution

Location: Basurabad beel of Batiaghata Upazila under Khulna District, Bangladesh

Start Date: 00-07-2017

End Date: 00-11-2017

Program Area: Resource Development and Management

Commodity: Fisheries diversity

Objectives:

To explore the fish assemblage of the Basurabad beel focusing the present status and possible threats along with conservation measures.

Methodology:

The Basurabad beel of Batiaghata Upazila under Khulna District, Bangladesh has purposively been selected as the study area. It is located in the southwestern coastal area of Bangladesh, between 22°42'45" to 22°43'46" north latitudes and between 89°29'54" to 89°31'15" east longitudes. The study area occupies an area of 2.43 sq. km. The beel is 2.21 km long from east to west and 1.86 long from north to south. The sampling points were selected in such a way that they cover the entire major parts of the beel. Data were collected on spot from local fishermen on monthly basis from July, 2017 to November, 2017. The study was set up based on both primary and secondary data. Primary data were collected from fishermen through well-structured questionnaire. Besides, secondary data were collected from the Upazila. Fisheries Office, relevant research articles, reports etc. Finally, each single species found in the sampling station was preserved in 10% buffered formalin solution in an earlier leveled plastic jar. After transporting to the laboratory, all 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). Moreover, Fish Base was also used as a guide (Froese and Pauly, 2015).

Source of Information: Archives of Agriculture and Environmental Science 4(4): 478-487 (2019)

Article Link (Online Journal): https://doi.org/10.26832/24566632.2019.0404015

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The fish diversity of the world is indisputably undergoing critical stage than the past. To achieve the conservation goal, in depth research on different arenas such as minimizing the pollution threats from the industries and agrochemical inputs should be carried out. Currently, the fish biodiversity of the Basurabad beel is under great threat due to fishing pressure, pollution, siltation, urbanization and other anthropogenic causes. These have been creating a great impact on the beel ecology. As a result, the water quality is deteriorating day by day and the availability of fish species is decreasing gradually. In the present study, total 33 species under 6 orders were recorded in Basurabad beel. There has been no Governmental and non-governmental survey introduced to estimate the fish biodiversity and fishing gears of Basurabad beel. During the study period, it was found that the fish abundance of Basurabad beel is declining at an alarming rate. The causes of these biodiversity declining are complete drying up in many parts of the beel during lean season, which is detrimental to fish populations and ecosystem. Some beel management policies should be adopted to protect the species which are at the degree of extinction and to recover sustainable production of the beel.

Knowledge Management: Journal