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Ivone Figueiredo - One of the best experts on this subject based on the ideXlab platform.
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Sex steroids of black scabbardfish, Aphanopus carbo, in relation to reproductive and migratory dynamics
Aquaculture and Fisheries, 2020Co-Authors: Inês Farias, João Delgado, Elsa Couto, Neide Lagarto, Adelino V.m. Canario, Ivone FigueiredoAbstract:Abstract Black scabbardfish, Aphanopus carbo, is a commercially important species that takes distant migrations throughout its life cycle. Sex steroids were measured by radioimmunoassay in the blood plasma of specimens caught off the Madeira Archipelago and mainland Portugal to link this species migratory path with its reproductive cycle. Furthermore, a pilot study using Mozambique tilapia (Oreochromis mossambicus) was designed to evaluate the effect of sample freshness on steroid levels because black scabbardfish blood was collected at separate times after specimens were caught. The changes in T and 11-KT concentrations between the time of blood extraction and the time after preservation did not statistically differ among the different methods applied. Therefore, measured black scabbardfish steroid concentrations were directly used in the subsequent data analyses. In females, E2 and in T concentrations peaked at a late stage of vitellogenesis. E2 concentration was significantly different between females caught off each area. Clustering E2 and T concentrations from all developing females resulted in the separation of two distinct groups, independently of their geographical area. In males, T and 11-KT were not significantly different between maturity stages. The hepatosomatic index of males caught off mainland Portugal was relatively high. This may reflect a mechanism for storing energy that will later be consumed during migration to the spawning grounds. The trend of sex steroids concentrations throughout the sexual maturation of the species is consistent with the morphological indicators and shows evidence of the reproductive and migratory pattern hypothesised for the black scabbardfish in NE Atlantic.
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2015Co-Authors: Ivone Figueiredo, Pedro Bordalo Machado, Leonel Serrano GordoAbstract:Deep-water sharks represent a major percentage of the total annual elasmobranch landings in mainland Portugal, primarily comprising Portuguese dogfish (Centroscymnus coelolepis), Leaf-scale gulper shark (Centrophorus squamosus) and Gulper shark (Centrophorus granulosus). These species are usually taken as by-catch from fisheries targeting other species. The present work describes the main characteristics of the fisheries for the three species mentioned above that take place mainly from Sesimbra and Peniche. Sesimbra accounts for nearly 50 % of the deep-water sharks landings in mainland Portugal and deep-water sharks constitute a by-catch of the black scabbardfish (Aphanopus carbo) fishery and in Peniche, a by-catch of multispecies artisanal fisheries. The focus was placed on a comparative analysis of the fishing regimes adopted at these two ports
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A State Space Model Approach for Modelling the Population Dynamics of Black Scabbardfish in Portuguese Mainland Waters
CIM Series in Mathematical Sciences, 2015Co-Authors: Isabel Natário, Ivone Figueiredo, M. Lucília CarvalhoAbstract:Black scabbardfish (Aphanopus carbo Lowe, 1839) is a widely distributed species across the Atlantic ocean. In Portuguese mainland waters the existing specimens are immature (not able to reproduce). It is admitted that they have migrated from the West of the British Isles and that they remain in the area for some years, until they attain an adequate size or physiological conditions which allow them to migrate and reproduce elsewhere.The present study aims to model the dynamics of the population of black scabbardfish living in the International Council for the Exploration of the Seas Division IXa, for which disaggregated data are available, although within the context of a larger population. With this purpose, a state-space model is used, which enables the estimation of the unknown abundance (latent process) by exploring its dependency relationship with the observational data on the species fishing landings in that area. The population is partitioned into length groups and the population evolution process is subdivided into biological related subprocesses.The estimation is achieved within a Bayesian paradigm, where all the available biological information is incorporated in the prior distributions of the parameters of the subprocesses. Later, short-term trajectories of the population living in IXa are studied, via simulations that are constructed based on different management scenarios.
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Spatial overlap between the leafscale gulper shark and the black scabbardfish off Portugal
Aquatic Living Resources, 2013Co-Authors: Nuno Madeira Veiga, Teresa Moura, Ivone FigueiredoAbstract:Information about the spatial distribution of bycatch species and their spatial overlap with the target species is essential for fisheries management. The present study used fishery-dependent data (vessel monitoring systems, logbooks and official daily landings) to study the spatial distribution and overlap between black scabbardfish Aphanopus carbo and leafscale gulper shark Centrophorus squamosus taken by the longline fishery operating off mainland Portugal. The geostatistical method kriging was applied to estimate the distribution of the leafscale gulper shark in relation to black scabbardfish and thus assess the impact of the fishery on the leafscale gulper shark. Results indicate that in fishing grounds where the black scabbardfish is more abundant, the relative occurrence of deepwater sharks is reduced. These findings have implications for alternative management measures to be adopted in this particular fishery, particularly where it concerns the minimization of deepwater shark bycatch.
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Black scabbardfish, Aphanopus carbo, in the northeast Atlantic: distribution and hypothetical migratory cycle
Aquatic Living Resources, 2013Co-Authors: Inês Farias, Pascal Lorance, Beatriz Morales-nin, Ivone FigueiredoAbstract:The biology, ecology, and dynamics of the deep-sea teleost black scabbardfish in the northeast Atlantic are reviewed. The black scabbardfish is a commercial bathypelagic species found in the NE Atlantic mostly from Iceland to the Canary Islands and Western Sahara, at depths from 800 to 1300 m. The spatial structure of its population is still uncertain, although the existence of one single stock that migrates around the NE Atlantic driven by feeding and reproduction is the most likely hypothesis consistent with available data. This review is based on data from commercial fisheries off the Faroe Islands, Hatton Bank, the west of the British Isles, and Portugal (mainland, Azores, and Madeira) and from Icelandic and Scottish scientific surveys collected between 1988 and 2012. Spawning of black scabbardfish occurs around Madeira and the Canary Archipelagos during the last quarter of the year. According to the migratory hypothesis, eggs, larvae, and possibly juveniles move north to areas from south of Icelandic and Faroe Islands to the west of the British Isles where they remain for some years to feed and grow. Then, they move south to the area off mainland Portugal, where they reach the size of first maturity but do not reproduce, and later move further south to the spawning grounds. Further studies are needed to understand which of the environmental conditions prevailing around Madeira and the Canaries, but not elsewhere, allow this species to mature and subsequently reproduce. This review suggests that a multidisciplinary approach is required to confirm the spatiotemporal migration and habitats used by black scabbardfish populations in the NE Atlantic at different life stages. Otolith contour shape and microchemistry, fatty acids, carbon and nitrogen stable isotopes, as well as steroid hormones are proposed as promising alternative tools for responding to this challenge.
João Delgado - One of the best experts on this subject based on the ideXlab platform.
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Two sympatric, not externally discernible, and heavily exploited deepwater species with coastal migration during spawning season: implications for sustainable stocks management of Aphanopus carbo and Aphanopus intermedius around Madeira
Canadian Journal of Fisheries and Aquatic Sciences, 2020Co-Authors: Joana Vasconcelos, João Delgado, Paulo Henriques, Ricardo Sousa, Antonieta Amorim, Rodrigo RieraAbstract:Several artisanal fisheries target deepwater species. These stocks are highly sensitive to overfishing because of their slow growth and late maturation. This vulnerability is higher if species conc...
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Sex steroids of black scabbardfish, Aphanopus carbo, in relation to reproductive and migratory dynamics
Aquaculture and Fisheries, 2020Co-Authors: Inês Farias, João Delgado, Elsa Couto, Neide Lagarto, Adelino V.m. Canario, Ivone FigueiredoAbstract:Abstract Black scabbardfish, Aphanopus carbo, is a commercially important species that takes distant migrations throughout its life cycle. Sex steroids were measured by radioimmunoassay in the blood plasma of specimens caught off the Madeira Archipelago and mainland Portugal to link this species migratory path with its reproductive cycle. Furthermore, a pilot study using Mozambique tilapia (Oreochromis mossambicus) was designed to evaluate the effect of sample freshness on steroid levels because black scabbardfish blood was collected at separate times after specimens were caught. The changes in T and 11-KT concentrations between the time of blood extraction and the time after preservation did not statistically differ among the different methods applied. Therefore, measured black scabbardfish steroid concentrations were directly used in the subsequent data analyses. In females, E2 and in T concentrations peaked at a late stage of vitellogenesis. E2 concentration was significantly different between females caught off each area. Clustering E2 and T concentrations from all developing females resulted in the separation of two distinct groups, independently of their geographical area. In males, T and 11-KT were not significantly different between maturity stages. The hepatosomatic index of males caught off mainland Portugal was relatively high. This may reflect a mechanism for storing energy that will later be consumed during migration to the spawning grounds. The trend of sex steroids concentrations throughout the sexual maturation of the species is consistent with the morphological indicators and shows evidence of the reproductive and migratory pattern hypothesised for the black scabbardfish in NE Atlantic.
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Deep stocks avoid competition migrating horizontal and vertically: The example of two scabbardfishes (Aphanopus spp.) targeted by long-liners in grounds next to an oceanic archipelago
Regional Studies in Marine Science, 2019Co-Authors: Joana Vasconcelos, João Delgado, Paulo Henriques, Ricardo Sousa, Antonieta Amorim, Rodrigo RieraAbstract:Abstract Fishing is occurring all over the globe, with an increase trend of exploiting deep stocks. Several species are currently targeted from the deep ocean, and some artisanal fisheries developed fishing gears, e.g. long lines, with limited impact to the environment but scarce information is available on biological aspects of these exploited stocks. In the Macaronesian region and specifically in Madeira archipelago, two Aphanopus sympatric species have been extensively exploited for decades but no detailed information is available on the spatial and vertical distribution of both species (Aphanopus carbo and Aphanopus intermedius). Currently, they represent an important percentage of landings from artisanal fishermen of Madeira (27% of the total catches in 2017). We herein observed that they showed a pattern of depth segregation, where adults of both species are more abundant (ca. 80%) at deeper seafloor (> 2500 m). A. intermedius was more numerous in fishing areas with greater seafloor depth (> 4500 m) compared to A. carbo. This pattern may be explained by a food source overlap between both species, and also the vertical segregation within the same species may be considered as a pattern to avoid cannibalism. Also, migration patterns were found in both species being more pronounced for A. intermedius where > 86% of individuals were collected offshore (> 12 n.m.). The present results constitute a step forward to start developing integrative management actions to preserve stocks of both species in the medium and long term in the study region.
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Deep-sea sharks as by-catch of an experimental fishing survey for black scabbardfishes (Aphanopus spp.) off the Canary Islands (NE Atlantic)
Scientia Marina, 2018Co-Authors: Mafalda Freitas, João Delgado, Joana Vasconcelos, Luísa Costa, Sebastián Jiménez, Viriato Timóteo, José A. GonzálezAbstract:The deep-sea sharks associated as by-catch of the Madeiran midwater drifting longline fishery for scabbardfishes (Aphanopus spp.) were investigated by means of an experimental survey at 800-1200 m depth within the Canary Islands Exclusive Economic Zone, whose fishing grounds have been exploited during the past 15 years. Nine species of chondrichthyans were identified, belonging to five families: Pseudotriakidae, Centrophoridae, Etmopteridae, Somniosidae and Chimaeridae. Data on length, weight and sex ratio for the 436 chondrichthyan individuals caught in the March 2009 survey are given. Several voucher specimens of each species caught were deposited in the collections of the Natural History Museum of Funchal.
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An Atlantic journey: The distribution and fishing pattern of the Madeira deep sea fishery
Regional Studies in Marine Science, 2018Co-Authors: João Delgado, Antonieta Amorim, Lídia Gouveia, Nuno GouveiaAbstract:Abstract The deep sea fishery targeting the black and intermediate scabbardfishes (Aphanopus spp.) off the Madeira archipelago represents one of the world long standing exploitations of meso- and bathypelagic fishes. The intensive fishing of the target species caused an overall decrease of more than (51%) in their yields. Fishing vessels had to go further away of the usual fishing grounds, leading to a progressive geographical expansion of the fishery reaching as far as the Southern Azores Seamount Chain and the Canaries Economic Exclusive Zone. Changes in the fishing pattern of the Madeira fleet were also registered along the last decades. Trends of the spatial distribution of the fishing sets and of the fishing pattern exerted by the Madeira fishing fleet in the North-central eastern Atlantic are presented herein and its implications for the conservation of the resource and fishery management are discussed, along with the emergence of new fisheries upon this resource at regional level. Changes in the conservation and management strategies followed so far is urgent and should integrate all fisheries acting upon the resource and take in account the phase of the life cycle it fishes otherwise the sustainability of the exploitation may soon be in danger. Authors propose a prohibition of bottom trawling bellow 200 m deep and a temporary closure of the fishery in some areas.
James C Chubb - One of the best experts on this subject based on the ideXlab platform.
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Larval trypanorhynchs (Platyhelminthes: Eucestoda: Trypanorhyncha) from black-scabbard fish,
EDP Sciences, 2014Co-Authors: G Costa, C J Veltkamp, James C ChubbAbstract:Four different types of trypanorhynch postlarvae were found attached to the stomach mucosa, external stomach wall or free in the body cavity of two marine fishes from Madeira, namely black-scabbard fish, Aphanopus carbo and oceanic horse mackerel, Trachurus picturatus. Morphological features shown by SEM indicated that the postlarvae belonged to the species Tentacularia coryphaenae, Sphyriocephalus tergestinus, Nybetinia lingualis and possibly N. yamagutii. Prevalence [mean intensity (range)] of T. coryphaenae, S. tergestinus and Nybetinia spp. in A. carbo (n = 135) was 12.6 % [1.65 ± 1.27 (1-6)], 5.9 % [1.57 ± 0.79 (1-3)] and 2.2 % [1.33 ± 0.58 (1-2)] respectively. The prevalence of T. coryphaenae and S. tergestinus showed some seasonality, with a rise in prevalence of T. coryphaenae corresponding to a decrease in prevalence of S. tergestinus. However these differences were not significant. In T. picturatus (n = 304) only N. lingualis was found at a prevalence of 9.6 %. Both S. tergestinus and N. lingualis were recovered only from the stomach mucosa or external stomach wall, while T. coryphaenae was observed either attached to the stomach mucosa or free in the visceral cavity of the fish. The paper presents the first scanning electron micrographs (SEM) of Sphyriocephalus tergestinus and a new geographical record of N. lingualis in T. picturatu
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larval trypanorhynchs platyhelminthes eucestoda trypanorhyncha from black scabbard fish Aphanopus carbo and oceanic horse mackerel trachurus picturatus in madeira portugal
Parasite, 2003Co-Authors: G Costa, C J Veltkamp, James C ChubbAbstract:Quatre sortes de trypanorhynques postlarvaires ont ete trouvees fixees a la paroi externe de l'estomac ou a l'etat libre dans la cavite generale de deux especes de poissons marins provenant de Madere : le sabre noir, Aphanopus carbo et le chinchard du large, Trachurus picturatus. Les caracteristiques morphologiques, etudiees au microscope a balayage indiquent que les posilarvae appartiennent aux especes suivantes : Tentacularia corypnaenae Sphyriocephalus tergestinus, Nybelinia lingualis et enfin probablement N. yarragutii. Le taux d'infestation [intensite moyenne (range)] de T. coryphaenae, S. tergestinus et Nybelinia spp. chez A. carbo (n = 135) est respectivement de 12.6 % [1.65 ± 1.27(1-6)], 5.9 % [1.57 ± 0.79 (1-3)] et 2.2 % [1.33 ± 0.58 (1-2)]. la prevalence de T. coryphaenae et S. tergestinus semble fluctuer selon les temperatures saisonnieres. avec une hausse de la prevalence de T. coryphaenae correspondant a la baisse de la prevalence de S. tergestinus. Neanmoins, ces differences ne sont pas significatives. Chez T. pictutatus, N. lingualis a une prevalence de seulement 9.6 % (n = 304). S. tergestinus et N. lingualis ont ete retrouves seulement dans l'estomac ou dans sa paroi externe alors que l'on constate que le T. coryphaenae se trouve soit fixe a l'estomac soit a l'etat libre dans la cavite viscerale du poisson. Ce travail presente les premieres images realisees en microscopie a balayage de S. tergestinus et une nouvelle mention geographique sur la presence de N. lingual chez T. picluratus.
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Cystacanths of Bolbosoma vasculosum in the black scabbard fish Aphanopus carbo, oceanic horse mackerel Trachurus picturatus and common dolphin Delphinus delphis from Madeira, Portugal.
Journal of Helminthology, 2000Co-Authors: G Costa, James C Chubb, C J VeltkampAbstract:Cystacanths of the acanthocephalan, Bolbosoma vasculosum Rudolphi 1819, were found to be encapsulated in the connective tissues of the viscera of the black scabbard fish, Aphanopus carbo and oceanic horse mackerel, Trachurus picturatus from Madeira, Atlantic Ocean. Juvenile worms were obtained from the intestine of a stranded common dolphin, Delphinus delphis , also from Madeira. Cystacanths were 11–15 mm long, with a proboscis of 18–19 longitudinal rows, eight hooks per row, and two sets of trunk spines. Overall, the morphology and dimensions of the proboscis, neck and trunk corresponded to previous descriptions. Scanning electron microscopy of the proboscis structures and trunk spines is provided for the first time. The prevalence of B. vasculosum in A. carbo increased with fish length. There were no statistical differences in the prevalence and intensity of infection between seasons. The intensity of infection was similar for male and female fishes, but there were significant differences in relation to length, longer fishes having heavier infections. Aphanopus carbo from Madeira represents a new host record and a new geographic location for B. vasculosum.
Leonel Serrano Gordo - One of the best experts on this subject based on the ideXlab platform.
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Reproductive strategies in black scabbardfish (Aphanopus carbo Lowe, 1839) from the NE Atlantic
Scientia Marina, 2009Co-Authors: Ana Neves, Ivone Figueiredo, Inês Farias, Ana Rita Vieira, Vera Sequeira, Leonel Serrano GordoAbstract:Gonads of the NE Atlantic black scabbardfish were examined to give an insight into the reproductive biology of this species. It was concluded that black scabbardfish had determinate fecundity because: (i) a distinct hiatus in oocyte size was observed between pre-vitellogenic and vitellogenic oocytes; (ii) vitellogenic oocytes increased in size during the spawning season; (iii) the number of vitellogenic oocytes did not increase during the spawning season; and (iv) the intensity of atresia was low in pre-spawning and spawning ovaries. Fecundity estimates ranged from 73 to 373 oocytes g-1 female. Comparison of developing ovaries from mainland Portugal and Madeira revealed that those from Madeira were more advanced in development, with more cortical alveoli stage oocytes and a higher gonadosomatic index. Starting in July, the reproductive development of all females from mainland Portugal was interrupted by a generalised atresia of developing oocytes. Completion of gametogenesis and spawning only occurred for fish from Madeira but some fish from this area also failed to complete oocyte development due to mass follicular atresia of vitellogenic oocytes. The percentage of Madeiran fish that failed to spawn due to follicular atresia ranged from 21.2% in 2006 to 37.4% in 2005
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Otolith shape analysis as a tool for stock discrimination of the black scabbardfish, Aphanopus carbo Lowe, 1839 (Pisces: Trichiuridae), in Portuguese waters
Scientia Marina, 2009Co-Authors: Inês Farias, Ana Rita Vieira, Leonel Serrano Gordo, Ivone FigueiredoAbstract:The variability in otolith contour shape of black scabbardfish (Aphanopus carbo) from Portuguese waters was analysed for stock discrimination purposes. The contour shape of otoliths from specimens caught off mainland Portugal, Madeira and Azores archipelagos was digitised and extracted according to the closed-form Fourier analysis technique. Mainland and Madeira specimens were compared through the adjustment of a MANOVA model to the normalised elliptic Fourier descriptor (NEFDs) obtained for the otoliths of 200 females and 200 males sampled at each area. Significant differences were found between areas and between sexes; the interaction term was not statistically significant. The effect of the area also proved to be significant when samples from the three regions were considered. These results were further supported by the discriminant analysis of the individual NEFDs for which the correct classifications were 87.5-89% when they were considered by sex and total length for the mainland and Madeira, and 90.9-97.7%, when NEFDs from the three areas were compared by sex and fish length. Otolith contour shape was shown to be a possible tool for differentiating between black scabbardfish stocks in the NE Atlantic
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Black scabbardfish (Aphanopus carbo Lowe, 1839) in the southern Northeast Atlantic: considerations on its fishery
Scientia Marina, 2009Co-Authors: Leonel Serrano GordoAbstract:Not available
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Age and growth of black scabbardfish (Aphanopus carbo Lowe, 1839) in the southern NE Atlantic
Scientia Marina, 2009Co-Authors: Ana Rita Vieira, Beatriz Morales-nin, Ivone Figueiredo, Inês Farias, Ana Neves, Vera Sequeira, Maria Rogélia Martins, Leonel Serrano GordoAbstract:14 pages, 10 figures, 7 tables.[EN] Though whole otoliths are commonly adopted in age assignment of black scabbardfish, this study showed that sectioned otoliths are more appropriate because growth increments are more evident and ageing of larger specimens is easier. Vertebrae are not the most appropriate structure for ageing but, in the absence of otoliths, this structure may be useful in age assignment of this species. To verify possible differences between age and growth among specimens from the southern NE Atlantic, 1075 sectioned otoliths from specimens from mainland Portugal, 436 from Madeira and 107 from the Azores were analysed and the distribution of length-at-age obtained for each sex and region was determined. Significant differences were obtained in the comparison of the distribution of length-at-age between Madeira, the mainland and the Azores. The von Bertalanffy growth model was applied to back-calculated mean length-at-age data from Madeira (Lt = 1586 [1 – e –0.119(t+2.282)] females; Lt = 1461 [1 – e –0.146(t+1.441)] males) and mainland (Lt = 1354 [1 – e –0.170(t+2.040)] females; Lt = 1240 [1 – e –0.208(t+1.654)] males), and significant differences in the growth equations were obtained. Furthermore, a regression tree model was used to investigate how growth is conditioned by reproduction. results showed a clear separation between individuals from the two areas, both females and males from the mainland (non-reproductive individuals) being characterised by a lower gonadosomatic index and a lower age[ES] A pesar de que los otolitos enteros son adoptados normalmente en lecturas de edad del sable negro, este estudio mostró que los otolitos seccionados son más apropiados porque los incrementos de crecimiento son más evidentes y facilita la asignación de edad en los peces de mayor talla. Las vértebras no son las estructuras más apropiadas para asignar la edad del sable negro, pero en ausencia de otolitos, esta estructura puede resultar de utilidad en dicho proceso. Para verificar posibles diferencias entre la edad y el crecimiento de especimenes viviendo en el sur del Atlántico nordeste, 1075 otolitos seccionados de ejemplares de sable negro de Portugal continental, 436 de Madeira y 107 de Azores fueron analizados, y se obtuvieron las distribuciones de tallas por edad por sexo, en cada región. Fueron observadas diferencias significativas en la comparación de las distribuciones de talla por edad entre Madeira, continente y Azores. El modelo de crecimiento de von Bertalanffy fue aplicado a los datos retrocalculados de talla media por grupo de edad de Madeira (Lt = 1586 [1 – e –0.119(t+2.282)] hembras; Lt = 1461 [1 – e –0.146(t+1.441)] machos) y continente (Lt = 1354 [1 – e –0.170(t+2.040)] hembras; Lt = 1240 [1 – e –0.208(t+1.654)] machos), y fueran encontradas diferencias significativas en las ecuaciones de crecimiento. Además, un modelo de árbol de regresión fue utilizado para estudiar cómo el crecimiento es condicionado por la reproducción. Los resultados mostraron una separación clara entre individuos de las dos áreas, caracterizándose tanto las hembras como los machos del continente (individuos no reproductivos) por un índice gonadosomatico y una edad más baja.This study was partially supported by the Fundação para a Ciência e Tecnologia (project POCTI/CVT/46851/2002).Peer reviewe
Maria Leonor Nunes - One of the best experts on this subject based on the ideXlab platform.
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Assessing risks and benefits of consuming fish muscle and liver: Novel statistical tools
Journal of Food Composition and Analysis, 2015Co-Authors: Carlos Cardoso, Cláudia Afonso, Helena Maria Lourenço, Maria Leonor NunesAbstract:Abstract Novel statistical tools were tested with the muscle and liver of anglerfish species ( Lophius piscatorius and Lophius budegassa ) and black scabbard fish ( Aphanopus carbo ) and the muscle of blackbelly rosefish ( Helicolenus dactylopterus ) and megrim species ( Lepidorhombus boscii and Lepidorhombus whiffiagonis ). Methylmercury (methyl-Hg) content and selenium (Se) and eicosapentaenoic (EPA) + docosahexaenoic acids (DHA) were analysed. For muscle, it was determined that probabilities of the methyl-Hg intakes exceeding the provisional tolerable weekly intake (PTWI) (weekly meal, from 1:12 in L. boscii to 1:2 in H. dactylopterus ) were always higher than probabilities of the Se and EPA + DHA intakes surpassing the recommended daily allowance (RDA) (weekly meal, never surpassing 1:2,938,713 in L. budegassa ) and intake (weekly meal, never surpassing 1:13,974 in L. whiffiagonis ), respectively. For liver, probabilities of the Se intakes exceeding the RDA (weekly meal, from 1:82 in L. piscatorius to 1:1.2 in A. carbo ) were higher than probabilities of the methyl-Hg intakes exceeding the PTWI (weekly meal, from 1:96 in L. budegassa to 1:4 in A. carbo ). The Se health benefit values calculated for the muscle (from 5.5 in H. dactylopterus to 27.5 in L. budegassa ) and liver (from 165.7 in L. piscatorius to 1041.7 in A. carbo ) were all positive.
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risk benefit assessment of cooked seafood black scabbard fish Aphanopus carbo and edible crab cancer pagurus as case studies
Food Control, 2013Co-Authors: Ana Luísa Maulvault, Maria Leonor Nunes, Carlos Cardoso, António MarquesAbstract:Abstract A risk–benefit assessment was performed in two marine resources of great importance in Southern Europe, i.e. black scabbard fish (Aphanopus carbo) and edible crab (Cancer pagurus), by determining the intake of Methyl-Hg, Cd, Se and EPA + DHA through the consumption of these species, as well as the associated probability of exceeding the tolerable weekly intakes (TWI; for Methyl-Hg and Cd) or dietary reference intakes (DRI; for Se and EPA + DHA). Average weekly intakes (AWI) were estimated by combination of the consumption frequencies in the Portuguese population and the concentration of each constituent. To estimate probabilities, two estimators were used: plug-in (PI) for higher probabilities and tail estimation (TE) based on the application of the extreme value theory to intakes distribution curves for lower probabilities. It was found that edible crab's white meat (meat from claws and legs) can be included on a well balanced diet, but black scabbard fish and edible crab's brown meat (mixture of gonads and hepatopancreas) should be consumed parsimoniously by adults and children.
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Risk–benefit assessment of cooked seafood: Black scabbard fish (Aphanopus carbo) and edible crab (Cancer pagurus) as case studies
Food Control, 2013Co-Authors: Ana Luísa Maulvault, Maria Leonor Nunes, Carlos Cardoso, António MarquesAbstract:Abstract A risk–benefit assessment was performed in two marine resources of great importance in Southern Europe, i.e. black scabbard fish (Aphanopus carbo) and edible crab (Cancer pagurus), by determining the intake of Methyl-Hg, Cd, Se and EPA + DHA through the consumption of these species, as well as the associated probability of exceeding the tolerable weekly intakes (TWI; for Methyl-Hg and Cd) or dietary reference intakes (DRI; for Se and EPA + DHA). Average weekly intakes (AWI) were estimated by combination of the consumption frequencies in the Portuguese population and the concentration of each constituent. To estimate probabilities, two estimators were used: plug-in (PI) for higher probabilities and tail estimation (TE) based on the application of the extreme value theory to intakes distribution curves for lower probabilities. It was found that edible crab's white meat (meat from claws and legs) can be included on a well balanced diet, but black scabbard fish and edible crab's brown meat (mixture of gonads and hepatopancreas) should be consumed parsimoniously by adults and children.
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Evaluation of hazards and benefits associated with the consumption of six fish species from the Portuguese coast
Journal of Food Composition and Analysis, 2013Co-Authors: Cláudia Afonso, Helena Maria Lourenço, Maria Luísa Carvalho, Matilde Castro, Carlos Cardoso, Narcisa M. Bandarra, Patrícia Anacleto, Maria Leonor NunesAbstract:Abstract The aim of this work was to evaluate the hazards and benefits of the consumption of 6 deep-water fish species from the Portuguese coast. Samples from muscle and liver of Lophius piscatorius and Lophius budegassa and Aphanopus carbo and from muscle of Helicolenus dactylopterus and Lepidorhombus boscii and Lepidorhombus whiffiagonis were analyzed. It was found that a portion size of 160 g significantly contributes to the recommended daily allowance/intake (RDA/RDI) for a balanced human diet, with respect to the essential elements analyzed. Moreover, 49% and 84% of the RDI of 500 mg for main n -3 polyunsaturated fatty acids was achieved through consumption of a 160 g portion of A. carbo and L. whiffiagonis , respectively. Average Cd and Pb contents in all fish muscle samples were consistently below the EU limit. Attending to the tolerable weekly intake/provisional tolerable weekly intake (TWI/PTWI), it appears that studied species muscle does not represent a hazard for human consumption. However, the consumption of liver of the studied fish species must be avoided. A weekly meal of L. whiffiagonis may be advised on the basis of its significant contribution for elemental and n -3 fatty acid requirements and its minimal contamination risks.
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Estimation of risk assessment of some heavy metals intake through black scabbardfish (Aphanopus carbo) consumption in Portugal.
Risk Analysis, 2010Co-Authors: Carlos Cardoso, Maria Leonor Nunes, Inês Farias, Valentina Costa, Leonel Serrano GordoAbstract:The intake of Cd, methyl-Hg, and Pb through consumption of black scabbardfish (BSF) (Aphanopus carbo) in Portugal as well as the associated probability of exceeding the respective provisional tolerable weekly intakes (PTWIs) was estimated. For this purpose, the contamination levels of heavy metals in this fish species were combined with constructed consumption scenarios or with a hypothesized consumption distribution. Whereas Cd and Pb posed no serious risk, the consumption of at least one portion of BSF per month as well as the hypothetical study in the Portuguese population produced nonnegligible probabilities of surpassing the PTWI for Me-Hg. Risk assessment for Portuguese consumers revealed a higher risk regarding Me-Hg, 1.19% and 1.81% with the plug-in (PI) and the tail estimation (TE) estimators, respectively. On the other hand, the risk for Cd and Pb was less than 1 in 100,000. TE was more realistic and accurate for Cd and Pb. Concerning Me-Hg, TE and PI estimators produced similar results. Furthermore, the limitations of a deterministic approach were shown.