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Present Status and Decreasing Causes of Shellfish Diversity of Passur River, Sundarban, Bangladesh

Dhiman Gain
School of Life Science, Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Simon K. Das
Marine Ecosystem Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia.

Abstract/ Executive Summary:

The objective of this study was to know the present status and decreasing causes of shellfish diversity in the Passur river of Sundarban, Bangladesh. The study was conducted over a period of five months from October 2011 to February 2012 on the Chandpai range of the Passur river, Sundarban, Bangladesh. A total of 14 shellfish species of three orders and 7 families were identified. On the basis of availability the species were categorized in four statuses that obtained as available (50%), less available (22%), rare (14%) and very rare (14%). Results of the study identified two species as very rare which may extinct near future resulting declination of the shellfish diversity. Few man made decline causes like water pollution, fishing in the sanctuaries, use of set bag and drag net to catch prawn an shrimp fry were observed as major threats for the diversity of shellfishes. The present work recommends preventing water pollution, increasing fishermen’s awareness, implementation of fisheries laws and reduction of using set bag and shore drag net to save the shellfish diversity of this important river of Sundarban, Bangladesh. Besides, counter and random survey is recommended to cross check the shellfish status for their proper management and conservation.

Keywords: Shrimp, Lobster, Inland fishery, Passur river, Fisheries resources,

Location: Khulna, Bangladesh

Start Date: 00-10-2011

End Date: 00-02-2012

Program Area: Conservation and Biodiversity

Commodity: Aquatic animal

Objectives:

To assess the present status and decreasing causes of shellfish diversity in Passur river of Sundarban, Bangladesh.

Methodology:

The present study was conducted over a period of five months from October 2011 to February 2012 on the Passur river which is in the middle part of the Sundarban (polyhaline zone) of Bangladesh and is connected with the Garai- Madhumati river through Atarabanki and Nabaganga rivers. The total length of the study area is about 20.71 km. Five sampling points, namely, Dhangmari, Karamjal, Chandpai, Joymoni and Harbaria, were selected at the middle of the river and river-canal meeting places. Specimens were collected fortnightly during daytime from the nearby fishermen and identified directly at the five selected points during the study period. Immediately photographs were taken earlier to preservation since formalin decolorizes the shellfishes color on long preservation. Samples were preserved in 10% formalin to save from spoilage. The specimens were identified to the species level. The species were then categorized in four statutes on the basis of interview and catch records of 180 fishermen as follows: Available (A): species observed throughout the year; Less Available (LA): species observed infrequently; Rare (R): species observed periodically; and Very Rare (VR): species observed fortuitously.

Source of Information: AACL Bioflux, 2014, Volume 7, Issue 6, 483-488

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The study is a preliminary attempt to assess the shellfish diversity on a particular point of Passur river, Khulna Bangladesh. The result of the study may not be the actual status of the shellfish diversity of the river as a whole. However, some recommendations like preventing water pollution, ensuring water flow, awareness of the fishermen, implementation of fisheries laws and declaration of fish sanctuary have been coming out to save the fish diversity of the study area. Besides, counter and random survey are recommended to cross check the shellfish status for their proper management and conservation.

Knowledge Management: Journal