Maximum Sustainable Yield Estimates of Marine Captured Shrimp Fishery of the Bay of Bengal, Bangladesh by Using Surplus
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Maximum Sustainable Yield Estimates of Marine Captured Shrimp Fishery of the Bay of Bengal, Bangladesh by Using Surplus Production Model Ehsanul Karim 1,2
&
Liu Qun 1 & Shanur Jahedul Hasan 2 & M. Zulfikar Ali 2 & M. Enamul Hoq 2 & M. Yahia Mahmud 2
Received: 19 March 2018 / Revised: 25 November 2019 / # Springer Nature Switzerland AG 2020
Abstract Surplus-production models (SPMs) are the foremost conventional methodical tool for assessing fish stock when the data comprised of a time series of catches for an exploited population. Annual catch and effort data of 24 years from 1991 to 2014 were analyzed to estimate the Maximum Sustainable Yield (MSY) of marine captured shrimps of Bangladesh by using packages of CEDA and ASPIC. The maximum catch was found 4188 Mt in 1992 and the minimum was 2175 Mt in 2006. In CEDA, the MSY was estimated by using the initial proportion (IP) value of 0.7 because the starting catch was approximately 70% of the maximum catch. The estimated MSY values of Fox and Schaefer from CEDA with two error assumptions were 2527 Mt and 2584 Mt; 2794 Mt and 2655 Mt, respectively. Besides, the estimated MSY results of Fox and Logistic (Schaefer) models from the ASPIC packages were 2472 Mt and 2347 Mt respectively. In conclusion, the estimated MSY values were smaller than the last catch (2733Mt) reveals the overfished stock of marine captured shrimp fishery which needed instant management strategies for sustainability. Keywords Bay of Bengal . ASPIC (a surplus production model incorporating covariates) . CEDA (catch and effort data analysis) . MSY (maximum sustainable yield)
Introduction Fisheries subdivision of agriculture plays a significant role in the economy of Bangladesh subsidizes about 3.69% to the GDP (Gross Domestic Product) and almost one-fourth (22.60%) to the agricultural GDP. In Bangladesh, the marine fishery has two sub-sectors i.e. commercial (trawl catch) fishery and artisanal fishery. Commercial trawl catch shrimp is one of the most significant segments in the marine capture in Bangladesh concerning local consumption, employment opportunity, foreign exchange earnings etc. At present 37 shrimp and 211 industrial fish trawlers (DoF 2016) are involved in fishing within the fishing grounds of the Bay of Bengal, Bangladesh (Fig. 1). As estimated, shrimp trawl catch
* Liu Qun [email protected] 1
Department of Marine Fisheries, College of Fisheries, Ocean University of China, Qingdao 266003, People’s Republic of China
2
Bangladesh Fisheries Research Institute (BFRI), Mymensingh 2201, Bangladesh
composition is mainly based on penaeid shrimp species i.e. giant black tiger shrimp (Penaeus monodon), brown shrimps (Metapenaeus monoceros, M. brevicornis, M. spinulatus),white shrimp (P. indicus) and other less valued shrimps (e.g. Acetus indicus, P. stylifera) (Uddin et al. 2012). Out of the above four species black tiger contributed 27% followed by brown 23%, white 21% and the rest are others (Uddin et al. 2012). All of the above species are mostly dispersed throughout the coastal areas o
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