Assessing the pomfret stock for setting catch limits in the northern Bay of Bengal, Bangladesh

Alam, Mohammed Shafiul; Li, Qun; Monwar, Md. Mostafa; Hoque, Md Enamul; Barua, Suman; Hassan, Md Leion; Munzer, Abdullah

doi:10.1016/j.aaf.2022.07.003

Cited by 5 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A low SPR value indicates a stock having a high percentage of juvenile and immature fish with few mature or large fishes in the catch composition. Though the level of targeted SPR is 40% (Figure 5D), empirically, it is not possible in many commercially exploited stock like black pomfret as historical catch driven by indiscriminate fishing ranging from juvenile to brood fishes using different gears from coastal water to the deep sea [33,64]. This led to growth and recruitment overfishing which has continued in the fishery over the last decades.…”

Section: Stock Condition Analysis Based On Lb-sprmentioning

confidence: 99%

Application of Length-Based Assessment Methods to Elucidate Biological Reference Points of Black Pomfret Stock in the Bay of Bengal, Bangladesh

Barua

Alam

et al. 2022

Fishes

Self Cite

View full text Add to dashboard Cite

The black pomfret (Parastromateus niger) is one of the high-income-generating carangid fish species and the only known member of its genus. This study aims to identify existing gaps in stock status and population demography of this species and provide viable management recommendations to enhance the sustainability of this fishery. Therefore, three methodological approaches have been used in this study; TropFishR to present the current exploitation status, the length-based spawning potential ratio (LB-SPR) to quantify stock spawning biomass, and Froese’s sustainability indicators (LBI) to establish a basic standard for sustainable management of the fishery. In the length-weight relationship of black pomfret, an allometric growth pattern (b = 2.19) was found. The VBGF life history parameters for black pomfret were L∞= 55.25 cm, K = 0.54 year−1, and based on LCCC analysis, the total mortality (Z = 1.61 year−1), natural mortality (M = 0.69 year−1) and fishing mortality (F = 0.91 year−1) are calculated. The result reveals that this fishery is currently suffering from overexploitation and the stock’s spawning biomass (SPR = 13%) is below the limit reference point because most of the catch (82%) was found to be under the maturity level. Based on the results, this study recommended strictly maintaining the mesh size of the net to ensure not to catch immature fish with a length smaller than 30.63 cm, recommended the length to catch be between 29 and 35 cm, and reducing fishing pressure by one-third to ensure the sustainability of the black pomfret fishery.

show abstract

Section: Stock Condition Analysis Based On Lb-sprmentioning

confidence: 99%

Application of Length-Based Assessment Methods to Elucidate Biological Reference Points of Black Pomfret Stock in the Bay of Bengal, Bangladesh

Barua

Alam

et al. 2022

Fishes

Self Cite

View full text Add to dashboard Cite

show abstract

“…Besides, the fish maw of eels has huge demand in the export market because of processed fish air bladder or swim bladder of eels like Congridae and Muraenesocidae are highly priced for edible purposes as well as medicinal value in many countries of Southeast Asia (Akhilesh et al, 2022). To date, most of the studies in this kind in Bangladesh are limited to the population dynamics and stock assessment of other commercially important fin fish and shrimp species (Barua et al, 2014;Barua et al, 2018;Barua, 2019;Alam et al, 2021;Barua et al, 2022;Alam et al, 2022a;Alam et al, 2022b;Alam et al, 2022c;Al-Mamun et al, 2021;Barua et al, 2023 and other studies). But, studies on the population dynamics and stock assessment of marine and estuarine eels of Bangladesh are yet to explore.…”

Section: Introductionmentioning

confidence: 99%

Population dynamics and stock assessment of two major eels (Muraenesox bagio and Congresox talabonoides) from the marine waters of Bangladesh

et al. 2023

Self Cite

View full text Add to dashboard Cite

Muraenesox bagio (black eel) and Congresox talabonoides (brown eel) are two major eels (Muraenesocidae) species which are commercially significant in the marine catch of Bangladesh, but population dynamics and stock assessment of marine eel fishery in Bangladesh are yet to be studied. This study is the first endeavour to analyze the population dynamics and stock assessment of this marine eels collected from July 2021 to May 2022 using three length-based methods namely TropFishR, the Length Based-Spawning Potential Ratio (LB-SPR) & the length-Based Indicators (LBI) and two catch-based methods including Depletion-Based Stock Reduction Analysis (DB-SRA) and the Catch-Maximum Sustainable Yield (CMSY). A slightly positive allometric growth pattern (b=3.10) for the black eel and a negative allometric growth pattern (b=2.33) for the brown eel were observed in the length-weight relationship. The parameters of von Bertalanffy Growth Function (VBGF) and the linearized length-converted catch curve (LCCC) analysis for black eel and brown eel were L∞=190.67cm and 166.63cm, k=0.18 year-1 and 0.16 year-1, and the total mortality, Z=0.70 year-1 and 0.45 year-1. The eel fishery is calculated to be overfished due to overexploitation and the stock’s spawning biomass (SPR=19% for black eel and 21% for brown eel) is close to the limit reference point but well outside the targeted range because the majority of the catches were found to have below-maturity levels. This study advised an optimum length limit to catch from 93 to 114 cm for black eel and 83 to 101 cm for brown eel. Though the estimated reference points of the CMSY were more optimistic than those from the DB-SRA, the tendency of the status of eel stock has been displayed moving towards overexploitation from a safe stock scenario. This study, therefore, recommended an annual landing limit of 250 mt as OFL (Over fishing limit) for the next ten years in association with existing management measures to maintain the present stock biomass of eel fishery over the BMSY level.

show abstract

“…The island is located on a shallow continental shelf with a maximum depth of 25 m. Its shallow‐water marine habitats comprise rocky and sandy intertidal, intertidal rock pools, offshore lagoons, rocky and sandy subtidal, and offshore soft‐bottom habitats. Shoreline habitats are sandy beaches and dunes, scattered rocks, and coral boulders, which are also found on the interior of the island (Alam & Hassan, 1997 ; Tomascik, 1997 ). The rocky habitats that support diverse scleractinian coral communities, and seaweed‐seagrass beds extend up to 200 m offshore from the lower intertidal.…”

Section: Introductionmentioning

confidence: 99%

DNAbarcoding of reef‐associated fishes of Saint Martin's Island, Northern Bay of Bengal, Bangladesh

Habib,

Islam,

Sakib

et al. 2023

Ecology and Evolution

View full text Add to dashboard Cite

This study employs the DNA barcoding approach to make a molecular taxonomic catalog of reef fishes of Saint Martin's Island (SMI), an ecologically critical area (ECA), and Marine Protected Area (MPA) in Bangladesh. DNA barcoding, along with morphological analysis, confirmed 84 reef‐associated fish species in SMI belonging to 16 orders, 39 families, and 67 genera. A total of 184 sequences were obtained in this study where 151 sequences (534–604 bp) of 81 species were identified from the COI barcode gene and 33 sequences (609 bp) of 19 species from the 16S rRNA gene region which were submitted to the GenBank and Barcode of Life Data System (BOLD). Among these sequences, 70 sequences of the COI gene and 16 sequences of 16S rRNA gene region from 41 species were submitted for the first time into the GenBank from Bangladesh. For molecular characterization analysis, another 37 sequences of 15 reef fish species of SMI were added from previous studies, making a total of 221 DNA sequences which comprised 179 sequences of 96 species for the COI gene and 42 sequences of 26 species for the 16S rRNA gene region. The COI sequences contain 145 haplotypes with 337 polymorphic sites, and the mean genetic distances within species, genera, and families were calculated as 0.34%, 12.26%, and 19.03%, respectively. On the contrary, 16S rRNA sequences comprised 31 haplotypes with 241 polymorphic sites, and the mean genetic divergences within species, genera, and families were 0.94%, 4.72%, and 12.43%, respectively. This study is a significant contribution to the marine biodiversity of Bangladesh which would facilitate the assessment of species diversity for strategizing management action. It is also an important input to the DNA barcode library of reef fishes of the northern Bay of Bengal.

show abstract

Assessing the pomfret stock for setting catch limits in the northern Bay of Bengal, Bangladesh

Cited by 5 publications

References 46 publications

Application of Length-Based Assessment Methods to Elucidate Biological Reference Points of Black Pomfret Stock in the Bay of Bengal, Bangladesh

Application of Length-Based Assessment Methods to Elucidate Biological Reference Points of Black Pomfret Stock in the Bay of Bengal, Bangladesh

Population dynamics and stock assessment of two major eels (Muraenesox bagio and Congresox talabonoides) from the marine waters of Bangladesh

DNAbarcoding of reef‐associated fishes of Saint Martin's Island, Northern Bay of Bengal, Bangladesh

Contact Info

Product

Resources

About