Strategy and Management, Control and Optimization, Management Science and Operations Research, Information Systems and Management
15
Scopus Publications
320
Scholar Citations
10
Scholar h-index
11
Scholar i10-index
Scopus Publications
The photodynamic inactivation in the control of the seafood zoonotic parasite, Anisakis sp. P. Ramos, A. S. Joaquinito, M. M. Oliveira, M. G. P. M. S. Neves, A. Almeida, M. A. F. Faustino Parasitology Research, 2026 Anisakis spp. L3 larvae commonly found in marine fish species are an important biological hazard when raw or inadequately thermally processed fishery products are consumed with live larvae, highlighting the need for effective control strategies. This study evaluated the efficacy and mechanism of photodynamic inactivation (PDI) of Anisakis L3 larvae, using the cationic photosensitizer (PS) 5,10,15,20-tetrakis(1-methylpyridinium-4-yl)porphyrin tetraiodide (TMPyP). Larvae were collected from Atlantic horse mackerel and grouped by size: batch A (larvae ≈ 1.5 cm) and batch B (larvae ≈ 2.0 cm). Inactivation assays were performed in microcosms at 50 µM of TMPyP under different conditions: incubation times (15 min to 21 h); incubation temperatures (0.5 and 22 °C); irradiation period (2–8 h) and light irradiance (4, 14 and 67 mW/cm2). Viability and tissue damage of the larvae were assessed at post-treatment. In both batches, 100% of larvae mortality was achieved after 21 h of dark incubation at 22 °C with TMPyP, followed by 6–8 h of white light irradiation at 67 mW/cm2. Similar results were observed in batch B, when the dark incubation was performed at 0.5 °C. Notably, batch B, larvae showed more exuberant cytotoxic effect, including severe damage of the intestinal epithelium, leading to loss of the characteristic triradiate appearance. These findings indicate that PDI using TMPyP is effective in inactivating Anisakis larvae and could be a potential alternative to freezing for ensuring the safety of fishery products in the food industry.
Host-parasite interactions of the sardine, Sardina pilchardus (Walbaum, 1792) from the Atlanto-Iberian Waters P. Ramos, AC. Nunes, MM. Oliveira, S. Garrido, A. Moreno, F. Rosa Parasitology Research, 2025 The European sardine, Sardina pilchardus (Walbaum, 1792) is one of the most abundant small pelagic clupeids and holds significant commercial value. Adult specimens were obtained along the Western and Southern Iberia, covering three ICES sub-divisions: 9aCN-Northerwestern Iberia, 9aCS-Southern Iberia and 9aS-South Iberia. A parasitological survey was carried out to characterize sardine parasite fauna and to assess its potential as a proxy for the spatial distribution of free-living parasite biodiversity and sardine trophic interactions, based on parasite richness and diversity. Parasites were analysed in different host organs and tissues. Fourteen parasite taxa were identified, which include Apicomplexa, Myxozoa, Monogenea, Digenea, Cestoda, Nematoda and Acanthocephala. Species diversity was higher in the Digenea group with a total of 2 116 specimens recorded. The Monogenea, Mazocraes alosae; the Cestoda, Scolex pleuronectis; the Acanthocephala, Rhadinorhynchus sp. and the Nematoda, Anisakis sp. and Hystherothylacium sp. larvae were also identified. This is the first study to investigate the relationship between parasite assemblages and diet composition in sardines from the Atlanto-Iberian coast. The finding highlight the potential of parasite fauna as indicator of food webs structure, free living parasite biodiversity and ecosystem stress, providing insights into differences observed among ICES sub-divisions. Both qualitative and quantitative variations in sardines' parasite comunities from the three ICES sub-divisions are in line with the differences observed in their prey composition, reflecting fine-scale trophic interactions linking parasites with intermediate and paratenic hosts present in the sardine diet.
Anisakis spp. larvae in black scabbardfish (Aphanopus carbo) muscle: Consumer health risk and recommendations along the value chain P. Ramos, C. Ayra-Pardo, M.M. Oliveira, L.F. Rangel, F. Atroch, C. Sirin, M.J. Santos Food and Waterborne Parasitology, 2025 The black scabbardfish, Aphanopus carbo , is a deep-sea Atlantic fish with socioeconomic value, but it is often heavily infected with Anisakis spp. larvae. The aim of the present work was to ascertain the distribution and quantification of Anisakis spp. larvae in the viscera and muscle of A. carbo , and to evaluate whether larval intensity in the viscera can be used to predict parasite load in the muscle. UV-press and pepsin-HCl digestion methods were complemented by molecular techniques to detect and identify the larvae. Four batches of four individuals each, one batch per season ( n = 64), were obtained. Each batch, with a different parasite intensity based on visual inspection, was selected for comparison. Larval subsamples randomly selected from the viscera, belly flaps, and dorsal muscle were identified by PCR-RFLP, marking the first study of this kind in this species. Data showed that the higher the larval load in the visceral cavity and internal organs, the greater the number of larvae in the belly flaps, allowing us to predict Anisakis burden in this site. The low number and unpredictability of the zoonotic A. simplex s.s in the dorsal muscle pose a risk to consumers. Epidemiological data support discarding the belly flaps from fish with relatively high parasite intensity. Additional recommendations to mitigate anisakids presence in fishery products are presented for improvement and implementation along the black scabbardfish value chain. • Classification of Anisakis larval intensity in A. carbo visceral cavity and organs into four grades • The greater the number of larvae in the viscera, the greater the number of larvae in the belly flaps • simplex s.s and A. pegreffii in A. carbo epaxial muscle pose a risk to consumers • Recommendations provided for the A. carbo value chain to mitigate anisakids
Portfolio efficiency analysis with SFA: the case of PSI-20 companies Nuno Barbosa Ferreira, Manuela M. Oliveira Applied Economics, 2016 This study aimed to assess the technical efficiency (TE) of individual companies and their respective sectors that are traded on the Portuguese stock market. We accomplished this by combining the internal input variables (e.g., ‘market value and return’) with exogenous variables (e.g., ‘interest income’, ‘depreciation’, ‘cost of goods’, ‘employees’ and ‘net sales’) into a Stochastic Frontier Analysis (SFA) model. The TE of the PSI-20 (Portuguese Stock Index) was estimated using factors that affect efficiency variability. The main advantage of using the SFA approach is its potential to discriminate between measurement error and systematic inefficiencies in the estimation process. The results demonstrated that TE is higher for enterprises in the industrial, construction and distribution sectors, whereas the commercial banking sector has the lowest TE scores. The ‘employees’ and ‘depreciation’ are the variables which most contribute to stock market inefficiency.
Evaluating the influence of skipper skills in the performance of Portuguese artisanal dredge vessels Manuela M. Oliveira, Ana S. Camanho, John B. Walden, Miguel B. Gaspar ICES Journal of Marine Science, 2016 It is widely recognized that skippers can have a significant role in their vessel performance levels. However, in many studies that seek to address differences in performance of vessels, the contribution of the skipper is often not quantified, or the influencing factors are not explained. This study examines the effect of social factors, such as family heritage, education and professional expertise, on skipper skill and the economic performance of the Portuguese artisanal dredge fleet. This is done using a stochastic production frontier model and data on the weekly activity of 54 vessels operating during 2013 and 2014. The results suggest that in this fishery age and education levels of skippers are important determinants of efficiency. Experience as a skipper was no determinant of performance, possibly due to the simplicity of the technical equipment onboard. From a managerial perspective, this indicates that local authorities should consider initiatives to enhance the education levels and professional training of skippers, if they aim to improve the effectiveness of artisanal fleets.
A system dynamics model to support the management of artisanal dredge fisheries in the south coast of Portugal J.H. Martins, A.S. Camanho, M.M. Oliveira, M.B. Gaspar International Transactions in Operational Research, 2015 This paper presents a management model developed to promote the sustainability of artisanal fisheries, considering socioeconomic and environmental dimensions. The management of artisanal fisheries faces many challenges, including the lack of appropriate tools to support policy makers and stakeholders in the decision‐making process. The model presented in this study is based on system dynamics and allows the simulation of the behavior of the artisanal dredge fishery on the south coast of Portugal, including four main species and two fleets. Two scenarios were simulated to assess the impact of regulatory measures on the system sustainability: scenario 1 simulated a permanent reduction of fishing effort, returning an improvement of biologic and economic sustainability; scenario 2 simulated the closure of one species for a period of one year to allow its recovery. It was found that although the revenue of fisheries decreases in that year, the system is able to return to the average levels of revenue three years after the closure. The study aimed to guide decision makers in the selection of the most appropriate measures toward the preservation of marine ecosystems and socioeconomic stability of fishing communities. The developed system dynamics model, combining available data with knowledge of fisheries experts, proved to be a useful scientific tool to identify management policies and organizational structures leading to greater success. This technique can be applied to the study of other fishery systems worldwide.
A novel and simple approach to define artisanal fisheries in Europe Lucía García-Flórez, Jesús Morales, Miguel B. Gaspar, David Castilla, Estanis Mugerza, Patrick Berthou, Laura García de la Fuente, Manuela Oliveira, Oscar Moreno, Juan José García del Hoyo, Luis Arregi, Celine Vignot, Rosa Chapela, Arantza Murillas Marine Policy, 2014
Diclidophora luscae (Monogenea: Diclidophoridae) in pouting, Trisopterus luscus (Linnaeus, 1758) from the northeast Atlantic; epidemiology, morphology … P Ramos, R Varandas, IL Conceição, A Grade, MM Oliveira, ... Parasitology Research 121 (9), 2517-2535 , 2022 2022 Citations: 2
Do fisher associations really represent their members’ needs and opinions? The case study of the octopus fishery in the Algarve (south Portugal) M Rangel, C Pita, MM de Oliveira, MH Guimarães, R Rainha, ... Marine Policy 101, 276-284 , 2019 2019 Citations: 22
Forecasting bivalve landings with multiple regression and data mining techniques: The case of the Portuguese Artisanal Dredge Fleet MM Oliveira, AS Camanho, JB Walden, VL Migueis, NB Ferreira, ... Marine Policy 84, 110-118 , 2017 2017 Citations: 10
Evaluating the influence of skipper skills in the performance of Portuguese artisanal dredge vessels MM Oliveira, AS Camanho, JB Walden, MB Gaspar ICES Journal of Marine Science 73 (10), 2721-2728 , 2016 2016 Citations: 17
Portfolio efficiency analysis with SFA: the case of PSI-20 companies NB Ferreira, MM Oliveira Applied Economics 48 (1), 1-6 , 2016 2016 Citations: 12
Predicting revenue efficiency of the Portuguese artisanal dredge fishery using external factors N Ferreira, M Oliveira, J Walden, AM Camanho 2016
Exploring Linkages of the Emergent Economies under a European Sovereign Debt Crisis Context N Ferreira, M Oliveira 2016
A system dynamics model to support the management of artisanal dredge fisheries in the south coast of Portugal JH Martins, AS Camanho, MM Oliveira, MB Gaspar International Transactions in Operational Research 22 (4), 611-634 , 2015 2015 Citations: 19
The phycotoxins׳ impact on the revenue of the Portuguese artisanal dredge fleet MM Oliveira, AS Camanho, MB Gaspar Marine Policy 52, 45-51 , 2015 2015 Citations: 14
A system dynamics model to support the management of artisanal dredge fisheries in the south coast of Portugal JM Hora, A Camanho, MM Oliveira, M Gaspar 2015
Untangling hotel industry’s inefficiency: An SFA approach applied to a renowned Portuguese hotel chain N Ferreira, M Oliveira Untangling hotel industry’s inefficiency: An SFA approach applied to a … , 2015 2015
Assessing technical and economic efficiency of the artisanal dredge fleet in the Portuguese West Coast MM Oliveira, AS Camanho, MB Gaspar Operational Research: IO 2013-XVI Congress of APDIO, Bragança, Portugal … , 2015 2015 Citations: 2
Enhancing the performance of quota managed fisheries using seasonality information: the case of the Portuguese artisanal dredge fleet MM Oliveira, AS Camanho, MB Gaspar Marine Policy 45, 114-120 , 2014 2014 Citations: 13
A novel and simple approach to define artisanal fisheries in Europe L García-Flórez, J Morales, MB Gaspar, D Castilla, E Mugerza, P Berthou, ... Marine Policy 44, 152-159 , 2014 2014 Citations: 68
Application of Bio-Economic Models in the Management of the Dredge Fleet in Portugal MMC de Oliveira PQDT-Global , 2014 2014 Citations: 1
An analysis of equity markets cointegration in the European sovereign debt crisis NB Ferreira, MM Oliveira Open Journal of Finance, 40-48 , 2014 2014 Citations: 5
Modelo de apoio à gestão da pescaria de bivalves com ganchorra no Algarve baseado em dinâmica de sistemas A Camanho, JM Hora, MM Oliveira, MB Gaspar 2014
Nonlinearities in the EU sovereign debt crisis N Ferreira, MM Oliveira 2014
Portfolio technical efficiency assessment with DEA: the case of the PSI-20 enterprises N Ferreira, MM Oliveira 2014
The influence of catch quotas on the productivity of the Portuguese bivalve dredge fleet MM Oliveira, AS Camanho, MB Gaspar ICES Journal of Marine Science 70 (7), 1378-1388 , 2013 2013 Citations: 16
MOST CITED SCHOLAR PUBLICATIONS
A novel and simple approach to define artisanal fisheries in Europe L García-Flórez, J Morales, MB Gaspar, D Castilla, E Mugerza, P Berthou, ... Marine Policy 44, 152-159 , 2014 2014 Citations: 68
Productivity change of the artisanal fishing fleet in Portugal: a Malmquist index analysis MM Oliveira, MB Gaspar, JP Paixão, AS Camanho Fisheries Research 95 (2-3), 189-197 , 2009 2009 Citations: 59
Technical and economic efficiency analysis of the Portuguese artisanal dredge fleet MM Oliveira, AS Camanho, MB Gaspar ICES Journal of Marine Science 67 (8), 1811-1821 , 2010 2010 Citations: 38
Do fisher associations really represent their members’ needs and opinions? The case study of the octopus fishery in the Algarve (south Portugal) M Rangel, C Pita, MM de Oliveira, MH Guimarães, R Rainha, ... Marine Policy 101, 276-284 , 2019 2019 Citations: 22
A system dynamics model to support the management of artisanal dredge fisheries in the south coast of Portugal JH Martins, AS Camanho, MM Oliveira, MB Gaspar International Transactions in Operational Research 22 (4), 611-634 , 2015 2015 Citations: 19
Evaluating the influence of skipper skills in the performance of Portuguese artisanal dredge vessels MM Oliveira, AS Camanho, JB Walden, MB Gaspar ICES Journal of Marine Science 73 (10), 2721-2728 , 2016 2016 Citations: 17
The influence of catch quotas on the productivity of the Portuguese bivalve dredge fleet MM Oliveira, AS Camanho, MB Gaspar ICES Journal of Marine Science 70 (7), 1378-1388 , 2013 2013 Citations: 16
The phycotoxins׳ impact on the revenue of the Portuguese artisanal dredge fleet MM Oliveira, AS Camanho, MB Gaspar Marine Policy 52, 45-51 , 2015 2015 Citations: 14
Enhancing the performance of quota managed fisheries using seasonality information: the case of the Portuguese artisanal dredge fleet MM Oliveira, AS Camanho, MB Gaspar Marine Policy 45, 114-120 , 2014 2014 Citations: 13
Portfolio efficiency analysis with SFA: the case of PSI-20 companies NB Ferreira, MM Oliveira Applied Economics 48 (1), 1-6 , 2016 2016 Citations: 12
Forecasting bivalve landings with multiple regression and data mining techniques: The case of the Portuguese Artisanal Dredge Fleet MM Oliveira, AS Camanho, JB Walden, VL Migueis, NB Ferreira, ... Marine Policy 84, 110-118 , 2017 2017 Citations: 10
Structural breaks and cointegration analysis in the EU developed markets N Ferreira, R Menezes, MM Oliveira International Journal of Latest Trends in Finance and Economics Sciences … , 2013 2013 Citations: 7
An analysis of equity markets cointegration in the European sovereign debt crisis NB Ferreira, MM Oliveira Open Journal of Finance, 40-48 , 2014 2014 Citations: 5
Artisanal fisheries analysis using the DPSIR framework and System Dynamics: the case of dredge fisheries in Portugal AS Camanho, J Hora, MM Oliveira, MB Gaspar FEUP/IPIMAR Report of the PRESPO Project, 30 , 2010 2010 Citations: 4
Review of fisheries studies applying DEA AS Camanho, J Hora, MM Oliveira, MB Gaspar 2011 Citations: 3
Analysis of the artisanal fisheries in the Atlantic Arc based on the DPSIR framework AS Camanho, J Hora, MB Gaspar, MM Oliveira FEUP/IPIMAR Report of Project PRESPO , 2010 2010 Citations: 3
Efficiency analysis of the Portuguese beam trawl fleet that targets the common prawn Palaemon serratus (Pennant) RJ Lopes, AS Rosa, LA Coelho, M Oliveira, MB Gaspar CEFAGE-UE working paper , 2008 2008 Citations: 3
Diclidophora luscae (Monogenea: Diclidophoridae) in pouting, Trisopterus luscus (Linnaeus, 1758) from the northeast Atlantic; epidemiology, morphology … P Ramos, R Varandas, IL Conceição, A Grade, MM Oliveira, ... Parasitology Research 121 (9), 2517-2535 , 2022 2022 Citations: 2
Assessing technical and economic efficiency of the artisanal dredge fleet in the Portuguese West Coast MM Oliveira, AS Camanho, MB Gaspar Operational Research: IO 2013-XVI Congress of APDIO, Bragança, Portugal … , 2015 2015 Citations: 2
Application of Bio-Economic Models in the Management of the Dredge Fleet in Portugal MMC de Oliveira PQDT-Global , 2014 2014 Citations: 1
