Sustainability status of the grouper fishery in the Azores archipelago: A length-based approach

Amorim, Patrícia; Sousa, Pedro; Menezes, Gui

doi:10.1016/j.marpol.2021.104562

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…For S. cretense , estimates for the Greek coast from scale readings ( L ∞ = 38.9 cm L T ) were much lower than those observed for the Azores ( L ∞ = 57.9 cm L T ). Longer L ∞ than those reported in the literature for S. colias [ 12 , 13 , 16 , 22 , 29 ] and S. atricauda [ 30 , 31 ] were also observed in this study. These differences are most likely due to the larger specimens present in this study.…”

Section: Discussionsupporting

confidence: 76%

“…To date, information on the growth and mortality of blue jack mackerel Trachurus picturatus , parrotfish Sparisoma cretense , Atlantic chub mackerel Scomber colias , red scorpionfish Scorpaena scrofa , blacktail comber Serranus atricauda , amberjacks nei Seriola spp., and black scabbardfish Aphanopus carbo is still scarce [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ] or nonexistent. Traditionally, these species have been caught by small-scale communities that depend on the multi-species catch in nearshore ecosystems to maintain their livelihoods and food security.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the exploitation and stock status relative to the maximum sustainable yield are unclear due to a deficiency of data on populational aspects [ 10 , 32 ]. Life-history information available concerning growth parameters of those species is restricted to studies of Isidro [ 33 ] and Garcia et al [ 17 ] for T. picturatus , Carvalho et al [ 12 ] for S. colias and Amorim et al [ 30 ] for S. atricauda . Studies on the mortality rate have only been undertaken in the Azores for S. colias [ 12 ] ( Table 1 ).…”

Section: Introductionmentioning

confidence: 99%

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Growth Parameters and Mortality Rates Estimated for Seven Data-Deficient Fishes from the Azores Based on Length-Frequency Data

Santos

Peixoto

Medeiros‐Leal

et al. 2022

Life

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Given the scarcity of information suitable for stock assessments, the growth and mortality of seven exploited marine fishes in Azorean waters were estimated based on length-frequency data. The studied species were Trachurus picturatus, Sparisoma cretense, Scomber colias, Scorpaena scrofa, Serranus atricauda, Seriola spp. and Aphanopus carbo. The growth parameters L∞ (cm), k (year−1) and ϕ’ estimated through the ELEFAN_GA_boot routine were set at 55.87, 0.08 and 2.39 for T. picturatus; 55.03, 0.11 and 2.53 for S. cretense; 55.93, 0.18 and 2.76 for S. colias; 61.11, 0.11 and 2.61 for S. scrofa; 52.10, 0.12 and 2.51 for S. atricauda; 107.33, 0.12 and 3.18 for Seriola spp.; and 133.16, 0.09 and 3.19 for A. carbo; respectively. The total mortality rate estimated using the length–converted catch curve method was 0.22, 0.35, 0.58, 0.32, 0.31, 0.39 and 0.22 year−1; the natural mortality included 0.15, 0.20, 0.30, 0.20, 0.21, 0.21 and 0.16 year−1; and fishing mortality rate 0.07, 0.15, 0.28, 0.12, 0.10, 0.18 and 0.06 year−1, respectively, for the species mentioned. The relatively large sizes and slow growth with a low natural mortality rate indicate a high vulnerability to overfishing. Therefore, assessment and management initiatives are highly encouraged to ensure the sustainability of the resources.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Growth Parameters and Mortality Rates Estimated for Seven Data-Deficient Fishes from the Azores Based on Length-Frequency Data

Santos

Peixoto

Medeiros‐Leal

et al. 2022

Life

View full text Add to dashboard Cite

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Performance of length-based assessment in predicting small-scale multispecies fishery sustainability

Medeiros‐Leal

Santos

Peixoto

et al. 2023

Rev Fish Biol Fisheries

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Small-scale fisheries play a critical role in food security and contribute to nearly half of reported global fish catches. However, the status of most small-scale fisheries stocks is still poor. In data-limited situations, length-based methods have been widely applied to estimate reference points and to understand stock status. This study applied three different length-based assessment methods (length-based indicators—LBI, length-based spawning potential ratio—LBSPR, and the length-based Bayesian biomass approach—LBB) to predict fisheries stock sustainability in the Azores. Overall, the three methods showed robustness for 15 out of 18 stocks assessed and agreed on their exploitation status. The results showed that 45% of the Azorean stocks were classified as sustainable stocks, 33% possible rebuilding/overfished and 22% overfishing/overfished stock status. Sensitivity analysis showed that biases on the source of initial life-history parameters, especially the asymptotic length (L∞) and the ratio of natural mortality and growth coefficient (M/k), have a stronger influence on the reference points of conservation of mature individuals (LBI), spawning potential ratio and fishing mortality (LBSPR) and the biomass relative to the maximum sustainable yield (LBB). Furthermore, sensitivity analysis indicated that, among the three methods, LBI is more robust. Our findings provide some management recommendations such as (1) catches and effort should be reduced; (2) minimum landing size should be increased; (3) minimum hook size should be increased, to be applied mainly for those stocks classified as possible rebuilding/overfished and overfishing/overfished stock status. Graphical abstract

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Sustainability status of the grouper fishery in the Azores archipelago: A length-based approach

Cited by 2 publications

References 35 publications

Growth Parameters and Mortality Rates Estimated for Seven Data-Deficient Fishes from the Azores Based on Length-Frequency Data

Growth Parameters and Mortality Rates Estimated for Seven Data-Deficient Fishes from the Azores Based on Length-Frequency Data

Performance of length-based assessment in predicting small-scale multispecies fishery sustainability

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