Iranian Journal of Fisheries Sciences

en Research Article: Stock status of Greenback mullet, Planiliza subviridis (Valenciennes, 1836) from the Shibsa River, coastal water of Southern Bangladesh through length-based models Stock assessment Stock assessment پژوهشي Orginal research papers Our study describes the stock status of Planiliza subviridis (Valenciennies, 1836) by emphasizing on growth pattern, growth parameters (asymptotic length, L∞; asymptotic weight, W∞; growth co-efficient, K; age at zero length, t0), sexual maturity size (Lm), age at sexual maturity (tm), growth performance index (Ø'), life-span (tmax), relative weight (WR), form factor (a3.0), mortality rates ( Z, M and F), exploitation rate (E), maximum sustainable yield (MSY), and relative biomass of P. subviridis from the coastal <a name="_Hlk151102270">Shibsa River</a>, Southern Bangladesh. A sum of 317 individuals of P. subviridis ranging from 6.50-19.70 cm total length (TL) was sampled during July 2017 to December 2019. The overall b value indicated isometric growth (b = 3.0) pattern. The estimated L∞, W∞, K, and t0 were 20.79 cm, 93.20 g, 1.02 per year, and 0.015 year, respectively. The Lm was estimated as 11.65 cm in TL and tm was 0.82 year. The tmax was 2.93 year and Ø' was 2.64. Fulton’s condition factor was found most suitable for this species. Further, the average relative weight (WR) indicated that the habitat was in a stable situation. In addition, the Z, M, and F were obtained as 2.23, 1.57, and 0.66 year-1, respectively. Length at maximum yield per recruit (Lopt) was estimated as 13.74 cm. Further, the E (0.30) and MSY, maximum sustainable Yield (0.29) indicated balance harvesting occurred in the coastal Shibsa River. Additionally, the relative numbers of survival, individual growth in weight, and cohort biomass was 24%, 40.0 g, and 100% (9.0 kg) when P. subviridis reached 1.2 years. Consequently, the results of our study will be supportive to implement a proper management strategy in the coastal Shibsa River and adjoining ecosystems of Bangladesh. Greenback mullet, Planiliza subviridis, Stock status, Coastal water, Shibsa River, Bangladesh 1084 1102 http://jifro.ir/browse.php?a_code=A-10-4373-1&slc_lang=en&sid=1 M.A. Islam tariqulsaikat@gmail.com 100319475328460051199 100319475328460051199 No Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh M.Y. Hossain hossainyeamin@gmail.com 100319475328460051200 100319475328460051200 Yes Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh D.K. Mondal debbfri@gmail.com 100319475328460051201 100319475328460051201 No Bangladesh Fisheries Research Institute, Brackish Water Station, Khulna, Bangladesh O. Rahman 100319475328460051202 100319475328460051202 No Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh M.S. Sarmin shakilasarmin13@gmail.com 100319475328460051203 100319475328460051203 No Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh M.T. Islam akhtarul.fh.ru@gmail.com 100319475328460051204 100319475328460051204 No Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh W. Sabbir wasimsabbirait@gmail.com 100319475328460051205 100319475328460051205 No Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna, Bangladesh M.A. Rahman ataurrahman179@gmail.com 100319475328460051206 100319475328460051206 No Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh M.L. Islam latiful.bfri@gmail.com 100319475328460051207 100319475328460051207 No Bangladesh Fisheries Research Institute, Brackish Water Station, Khulna, Bangladesh M.S. Khatun shefalyboripara@gmail.com 100319475328460051208 100319475328460051208 No Department of Zoology, Rajshahi College, National University, Bangladesh M.F. Parvin foridaru46@gmail.com 100319475328460051209 100319475328460051209 No Institute of Environmental Science, University of Rajshahi, Rajshahi, Bangladesh J. Ohtomi ohtomi@fish.kagoshima-u.ac.jp 100319475328460051210 100319475328460051210 No Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan M.A. Rahman ashiqru17@gmail.com 100319475328460051211 100319475328460051211 No Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh