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Virtual Population Analysis of Glory Scallop (Mimachlamys gloriosa, Reeve 1853) in Asid Gulf, Philippines

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Abstract

Virtual population analysis using the Jones’ length-based cohort method was conducted to the Glory scallop (Mimachlamys gloriosa Reeve, 1853) from Asid Gulf, Philippines. The study aimed to reconstruct the biomass and population structure as inputs to estimating the maximum sustainable yield (MSY) along with the fishing mortality expended on the stock and evaluate the effect of introducing minimum size restriction to the yield and biomass of M. gloriosa. Length-frequency data sampled from commercial catches covering 12 months from April 2018 to March 2019 were used and analyzed. The proportion of M. gloriosa from the total scallop production was transformed into total catches (in numbers) using the allometric length–weight relationship W = 0.5632L2.295 (R2 = 0.90). The estimated population of M. gloriosa is about 300,000 individuals, equivalent to a mean biomass of 6.76 tonnes (T). The estimated total yield of 8.09 T is relatively higher than the estimated maximum sustainable yield (MSY = 5.88 T), indicating unsustainable harvesting and high fishing pressure. This excessive harvest coupled with high exploitation ratios (E yr−1) ranging from 0.65 to 0.84 directed toward the larger length-groups (5.65–8.45 cm, SH) would imperil the breeding stock and lead it to recruitment overfishing. Using Thompson and Bell model, the effect of imposing minimum size (6.35 cm shell height) restriction shows an increase of 7.62% and 20.45% to the annual yield and biomass, respectively which is a positive implication of this strategy.

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The data for the study is available upon reasonable request from the corresponding author.

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Acknowledgements

The paper contributes to the project “Development of Innovative Scallop Mariculture Techniques (DIVSMART)” funded by Bicol University, Legazpi City. We sincerely acknowledged the contributions of Mr. Christian Cabiles, Dr. Renan Bobiles, and Dr. Alex Camaya during data collection. We also want to thank the Rodrigo Family for accommodating the researchers and the scallop divers for cooperating during the survey interview.

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The study was funded by Bicol University, Legazpi City, Philippines.

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All the authors listed in this study contributed substantially to the formulation of study design, data collection and analysis, data interpretation, and manuscript preparation.

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Correspondence to Ian Cris R. Buban.

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Buban, I.C.R., Soliman, V.S. Virtual Population Analysis of Glory Scallop (Mimachlamys gloriosa, Reeve 1853) in Asid Gulf, Philippines. Thalassas 37, 841–850 (2021). https://doi.org/10.1007/s41208-021-00326-z

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