Stock Assessment for Seven Fish Species Using the LBB Method from the Northeastern Tip of the Bay of Bengal, Bangladesh

Md. Abdullah Al-Mamun, Qun Liu, Sayedur Rahman Chowdhury, Md. Sharif Uddin, K. M. Shahriar Nazrul and Rokeya Sultana
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Md. Abdullah Al-Mamun: College of Fisheries, Ocean University of China, Qingdao 266003, China
Qun Liu: College of Fisheries, Ocean University of China, Qingdao 266003, China
Sayedur Rahman Chowdhury: Institute of Marine Sciences, University of Chittagong, Chittagong 4331, Bangladesh
Md. Sharif Uddin: Department of Fisheries, Ministry of Fisheries & Livestock, Dhaka 1217, Bangladesh
K. M. Shahriar Nazrul: Department of Fisheries, Ministry of Fisheries & Livestock, Dhaka 1217, Bangladesh
Rokeya Sultana: College of Fisheries, Ocean University of China, Qingdao 266003, China

Sustainability, 2021, vol. 13, issue 3, 1-11

Abstract: Assessment of fish stock status is generally required for fisheries management, which is difficult when the data are limited. The length-based Bayesian Biomass (LBB) approach is a powerful and new method, where only the length-frequency data are used for estimating the status of fisheries resources. Here, we applied the LBB method to assess the status of seven commercially valuable marine fishes from the northern tip of the Bay of Bengal (BoB), Bangladesh. These species were Lepturacanthus savala , Pampus argenteus, Nemipterus japonicas, Nemipterus randalli, Ilisha filigera, Saurida tumbil, and Upeneus sulphurous . The current relative biomass ( B/B 0 ) ratios were smaller than the B MSY /B 0 in five stocks, except for N. japonicas and N. randalli , and this indicates that, of the seven populations assessed, two are grossly overfished, three are overfished, and two are healthy stocks. Moreover, the length at first capture ( L c ) was lower than the optimal length at first capture ( L c_opt ) in all seven populations, which indicates growth overfishing, suggesting that increasing the mesh sizes would be beneficial. The present findings confirm that Bangladesh’s coastal water fishery resources are declining. More specific targeted management measures should be taken to recover the country’s marine fishery resources.

Keywords: the Bay of Bengal; stock assessment; LBB method; length-frequency data; overfishing (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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