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Present Status and Exploitation of Nile Tilapia, Oreochromis Niloticus (linnaeus, 1758) in Kaptai Lake, Bangladesh

Krishna Chandra Roy
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Md. Shahidur Rahman
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Zoarder Faruque Ahmed
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

A study was carried out in the Kaptai Lake of Bangladesh to determine the present condition of Nile tilapia (Oreochromis niloticus), tilapia fishers, fishing gears, catch records and management policies. Data were collected by personal observation and other participatory methods in a year. It was found that tilapia productions were high in 1999-2000 (160.83 mt, 2.94%) and in 2000-01 (180.78 mt, 3.51%), respectively. In 2008-09, tilapia production was comparatively very low (31.85 mt, 0.86%) where lowest contribution (0.70%, 43.04 mt) in 2011-12 fiscal year. Professional, seasonal professional and subsistence fisherman were found to catch tilapia. Highest and lowest amount of catch were found in lift net (32%) and cast net (3%); and longest and shortest fishing durations were found in current net (13hrs/day) and cast net (4hrs/day), respectively. For being an exotic fish species, tilapia was being neglected for specific management practices to protect.

Keywords: Tilapia, Tilapia fishers, Exploitation, Protection, Management

Location: Kaptai Lake of Rangamati district

Start Date: 00-07-2014

End Date: 00-06-2015

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

Problems encountered in the culture of O. niloticus is that it is extremely difficult to keep the population down due to its quick breeding habits resulting in overcrowding and stunting of the stock. So, the present study was undertaken to know the present status of tilapia, tilapia fishers, fishing gears, catch records, marketing systems and the existing management practices of tilapia to protection.

Methodology:

In order to collect relevant information survey method was followed. By this technique the information were collected by the memory of the adjacent people specially the fisherman as per interview and from the fish culturist and the fish marketing officer of BFDC. For this study a combination of questionnaire interview, Participatory Rural Appraisal (PRA) tool such as Focus Group Discussion (FGD) and cross-check interviews with key informants were used for fishermen.

2.1 Study area and duration Based on the concentration of tilapia fish production, Kaptai Lake of Rangamati district was considered for this study (Fig. 1). The data were collected in respect of tilapia fishery in the Kaptai reservoir for one year from July 2014, to June 2015 to fulfill the requirement of the research objectives. The study was based on field survey where primary data were collected from the Kaptai Lake.

2.2.1 Primary data source Collection of primary data was made by field observation and fishers interview using structured questionnaire. For this study a combination of questionnaire interview, Participatory Rural Appraisal (PRA) tool such as Focus Group Discussion (FGD) and cross-check interviews with key informants were used for data collection. 2.2.2 Secondary data source Secondary data were collected from Bangladesh Fisheries Research Institute (BFRI), Riverine sub-station, Rangamati, Bangladesh Fisheries Development Corporation (BFDC), Rangamati, Statistical yearbook of Bangladesh, Development board Rangamati hill tracts, Department of agricultural extension, Rangamati, various government agencies, various books, journals theses, autonomous bodies and NGOs.

2.3 Questionnaire designs For collection of information regarding gear types, fish composition, catch records of various fish species of Kaptai Reservoir specially the tilapia (Oreochromis niloticus), existing status of tilapia were designed keeping in mind the specific objectives of the study. Questionnaires were filled up through direct observation of gears and their catch and also interviewing the fishers’ community.

2.4 Data processing and analysis The collected data were recorded, summarized and processed for analysis. Tabular techniques were applied for the analysis of data by using Microsoft Excel.

Source of Information: International Journal of Fisheries and Aquatic Studies 2018; 6(3): 200-204

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In Bangladesh, fish products provide about 60% protein source [18]. Most of the people do not get their enough nutrition whatever they need. So, only fish can fulfill the protein demand of our people. As tilapia contributes a handsome proportion to the total fish production of the Kaptai Lake, fulfills the nutritional requirements and improves socioeconomic condition of the tilapia fishers, it is necessary to ensure tilapia production in this Lake through assessing Maximum Sustainable Yield in order to suggest the highest amount of fish that could be taken from the lake each year. Sanctuaries development, fishing regulations implementation, and being familiar with spawning and egg brooding period for imposing closed season are suggested to conserve this valuable species in Kaptai Lake.

Knowledge Management: Journal