Population Dynamics of Five Important Commercial Fish Species in the Sundarbans Ecosystem of Bangladesh: Recent Advancement | Chapter 3 | Current Research Trends in Biological Science Vol. 1

Aims: To determine the population dynamics and assess the exploitation level of Mystus gulio, Acanthopagrus latus, Chelon parsia, Otolithoides pama and Lates calcarifer in the Sundarbans ecosystem of Bangladesh. Study Design: Monthly length-frequency data of five fish species were collected from the Sundarbans ecosystem. The lengths of five fish species were recorded to the nearest one cm intervals in each month. Place and Duration of Study: The study was conducted from January to December 2011 in the Sundarbans ecosystem in Bangladesh. Methodology: The FAO-ICLARM Fish Stock Assessment Tools (FiSAT II) software was used to estimate the von Bertalanffy growth parameters (L and K), mortality coefficients (Z, M and F), probability of capture, recruitment pattern and Yield/Biomass-per-recruit for five commercially important fish species caught by fishers in the Sundarbans ecosystem of Bangladesh. Results: In the Sundarbans ecosystem of Bangladesh area the values of asymptotic length (L) for Mystus gulio, Acanthopagrus latus, Chelon parsia, Otolithoides pama and Lates calcarifer were found to be 23.0 cm, 33.6 cm, 30.0 cm, 32.5 cm and 55.0 cm respectively while the growth co-efficient (K) were 0.75, 0.85, 1.1, 0.8 and 0.5 respectively. The estimates for L (23.00 – 55.0 cm) and K (0.5-1.1 year-1) obtained were consistent with those available in the literature. Relatively high K and low L values, typical of short-lived tropical fishes, were obtained for Mystus gulio, Acanthopagrus latus, Chelon parsia and Otolithoides pama. The length growth performance index (’) of the Pauly and Munro’s function was in the range of 2.599 – 3.180. Natural mortality, fishing mortality and total mortality were in the range of 0.956-1.89, 0.55-1.58 and 1.52-3.3 respectively. Estimates for total mortality (Z) and natural mortality (M) imply low annual rates of survival and high turnover rates. The recruitment pattern suggested one main pulse of annual recruitment. The exploitation rate was estimated to be between 27% and 47% and the length at first capture was estimated to be approximately 19-54% of L. The exploitation rate obtained for five fish species are relatively lower compared to other available studies in the coastal areas of Bangladesh. The growth and exploitation rates obtained were compared with available estimates to evaluate the consistency of the results with current knowledge about the species in the region. Conclusion: The study indicated that the length-at-first-capture/L seem to be a simple parameter, which could be used to make a rapid assessment of the status of the stocks. All together, the present study reveals that the population of these five studied species attains acceptable sustainability levels in the Sundarbans ecosystem and scope for a slight increase in catch efforts. 

Author(s) Details  

Md. Golam Mustafa
Center for Resource Development Studies Ltd, 13C/8C Babar Road, Block B, Mohammadpur, Dhaka 1207, Bangladesh.

Imran Ahmed
Department of Forest, Bon Bhaban, Agargaon, Dhaka 1207, Bangladesh.

Mohammod Ilyas
WorldFish, South Asia, Level 5-7, House 2/B, Road 4, Block B, Banani, Dhaka 1213, Bangladesh.

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Knowledge and Awareness of Anthrax among the Community People at High, Medium and Low Risk Areas of Bangladesh | Chapter 04 | Emerging Research in Medical Sciences Vol. 3

A cross-sectional survey was conducted to assess information about the awareness, attitudes and management practice towards Anthrax. Administrative areas of Bangladesh had been classified as high, medium, and low risk anthrax areas by assessing the risk of anthrax from reports published in daily newspapers and journals. The selected high, medium and low risk areas were Kushtia, Pabna and Mymensingh, respectively. The animal owners and family members, butchers, affected people by cutaneous anthrax were considered as the key informants. Data of management practice including feeding, awareness of zoonosis; vaccination and formal education were collected using interview-questionnaire method. A total data of 622 was collected and uploaded to the data collection tools “Magpi” and the data analysis was carried out using Epi Info™. We found a great worry about educational status in our study sites. Among the interviewers, we found about Half of people had no formal education (46.46%, 289/622). Farmers in the high risk districts significantly more aware of anthrax compared to those from medium-(p=0.000) and low-(p=0.000) risk districts. Knowledge of zoonosis of Anthrax and vaccination of Anthrax were also very poor among the people from low and medium risk areas. For treatment purpose, most of the farmers (about 98%) of high and low risk areas depend on village doctors. We also found that Improper washing of grass-(p=0.000) and flood-(p=0.000) were significantly responsible for Anthrax outbreaks. Finally we suggest, proper washing of grass, increase awareness towards zoonosis of Anthrax and vaccination, proper treatment by veterinarian should be insured to reduce Anthrax outbreak in Bangladesh.

Author(s) Details

K. H. M. Nazmul Hussain Nazir
Department of Microbiology and Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymeinshg-2202, Bangladesh.

Md. Ariful Islam
Department of Microbiology and Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymeinshg-2202, Bangladesh.

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