Centro Tecnologico del Mar CETMAR

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Centro Tecnologico del Mar CETMAR

Spain
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Rodriguez L.,Conselleria do Medio Rural e do Mar | Gomez L.,Centro Tecnologico del Mar CETMAR | Azevedo C.,Abel Salazar Biomedical Sciences Institute | Azevedo C.,King College
Journal of Invertebrate Pathology | Year: 2012

In Galicia, there is an increasingly interest among representatives of the oyster industry in the development of Pacific oyster Crassostrea gigas culture. Nevertheless severe mortalities and emerging health problems in this species have been recently reported in European farming areas. A histological survey was performed from 2004 to 2009 to assess health status in both cultured and wild Galician oysters. Different symbiotic organisms and conditions were detected, including viral gametocytic hypertrophy (VGH) which is reported here for first time in Spanish coast. VGH, prokaryote-like colonies and ciliates were observed in oyster tissues without causing host damage. A haplosporidian infection, copepods inducing lesions and a cellular proliferative disorder were detected in some samples causing moderate host damage; their low prevalence suggests these parasites are not a threat for C. gigas in Galicia. None of the parasites detected is OIE (Office International des Epizooties: the World Organization for Animal Health) notifiable. Although the current study did not identify any pathogens or diseases of concern, it provides important prevalence baseline data for future health and epidemiological assessments needed to better understanding the existing and emerging health problems in this species. © 2012 Elsevier Inc.


De Abreu D.A.P.,Dep. of Analytical Chemistry | De Abreu D.A.P.,University of Vigo | Rodriguez K.V.,University of Santiago de Compostela | Maroto J.,Centro Tecnologico Del Mar CETMAR | Cruz J.M.,University of Vigo
Food Science and Technology Research | Year: 2011

Comparison of lipid damage during frozen storage and the capacity of the natural antioxidant to retard oxidation of polyunsaturated fatty acids in swordfish muscle were investigated. Swordfish fillets were packaged in low density polyethylene with or without the natural antioxidant and frozen for 12 months at -20°C. In the twelfth month, swordfish packed with natural antioxidant showed a lower lipid hydrolysis than in swordfish control sample. Furthermore, swordfish packed with natural antioxidant showed a lower lipid oxidation (primary and secondary lipid oxidation) than in muscle of swordfish control sample. In fact, the total oxidation observed was lower in the samples packed with natural antioxidant than the control during the frozen storage. The results confirm the efficacy of an active packaging with a natural antioxidant derived from barley husks to slow down the progress of lipid hydrolysis and increase oxidative stability in swordfish muscle.


Cacabelos E.,University of Vigo | Olabarria C.,University of Vigo | Incera M.,Centro Tecnologico del Mar CETMAR | Troncoso J.S.,University of Vigo
Estuarine, Coastal and Shelf Science | Year: 2010

Patterns of distribution and abundance of epifauna often differ markedly among macroalgal species. The hypotheses tested were that (1) assemblages of mobile epifauna associated with Laminaria ochroleuca and Sargassum muticum differed because they have different structure, and (2) assemblages of mobile epifauna associated with S. muticum differed between heights on the shore because tidal height affects physical and biological conditions. We also investigated the effect of epiphytic biomass on the composition of epifaunal assemblages. Hypotheses were tested with measuring and manipulative experiments using natural and artificial algae, and by measuring uni- and multivariate assemblage descriptors. The results indicated that epifaunal assemblages associated with natural L. ochroleuca and S. muticum differed, but only differences in epifaunal densities were likely to be related to the structure of algae since all other variables did not clearly differ between the two algae. Although structure might play an important role, other factors need to be taken into account and further experimental tests are necessary. Epifaunal assemblages associated with S. muticum did vary depending on the height on the shore, but inconsistently over time in the case of natural algae. In addition, epifaunal densities of natural algae were positively related to biomass of epiphytes in both species. Time of sampling, epiphytic load and height on the shore were the most important factors in structuring epifaunal assemblages rather than complexity of the host algae. © 2010 Elsevier Ltd.


Pereira de Abreu D.A.,University of Vigo | Pereira de Abreu D.A.,University of Santiago de Compostela | Maroto J.,Centro Tecnologico del Mar CETMAR | Villalba Rodriguez K.,University of Santiago de Compostela | Cruz J.M.,University of Santiago de Compostela
Journal of the Science of Food and Agriculture | Year: 2012

BACKGROUND: The changes in quality of cod fillets packaged in films with and without antioxidants during 12 months of frozen storage at - 20 °C were investigated in the present study. The following parameters were determined in order to study lipid hydrolysis and primary and secondary lipid oxidation in the samples during frozen storage: peroxide value, conjugated dienes, conjugated triene hydroperoxides, free fatty acids, totox value, thiobarbituric acid-reactive substances and p-anisidine value. RESULTS: Films containing antioxidants isolated from barley husks were effective in slowing down lipid hydrolysis and primary and secondary lipid oxidation processes. Secondary lipid oxidation reached maximum values in the 12th month of storage in control samples and samples packaged with antioxidant-containing film. Maximum lipid hydrolysis and lipid oxidation values for control cod samples were significantly higher than the maximum values found in samples packaged with antioxidant-containing film. CONCLUSION: The results confirm the efficacy of natural antioxidants derived from barley husks in slowing down lipid hydrolysis and increasing the oxidative stability of cod flesh. They also demonstrate the potential usefulness of natural antioxidants extracted from barley husks in the development of active packaging films for food preservation. © 2011 Society of Chemical Industry.


De Abreu D.A.P.,University of Santiago de Compostela | Losada P.P.,University of Santiago de Compostela | Maroto J.,Centro Tecnologico Del Mar CETMAR | Cruz J.M.,University of Vigo
Food Chemistry | Year: 2011

The use of peroxide value (PV), free fatty acids (FFA), thiobarbituric acid reactive substances (TBARS) and p-anisidine value (PA) proved suitable for studying lipid hydrolysis and primary and secondary lipid oxidation in samples of Atlantic halibut throughout frozen storage. After twelve months, the FFA values in the samples packaged with the film containing natural antioxidants (extracted from barley husks) were similar to the FFA value in the control sample after 9 months. Maximum peroxide value in the samples packaged with the antioxidant-containing film was found one month after the maximum value observed in the control sample. After six months, the concentration of malondialdehyde in the control sample was approximately 30-50% higher than in samples packaged in film containing antioxidants. The results confirm the efficacy of natural antioxidants derived from barley husks and antioxidant active packaging film in slowing down lipid hydrolysis and increasing the oxidative stability of Atlantic halibut flesh. © 2010 Elsevier Ltd. All rights reserved.


Pereira de Abreu D.A.,University of Santiago de Compostela | Losada P.P.,University of Santiago de Compostela | Maroto J.,Centro Tecnologico del Mar CETMAR | Cruz J.M.,University of Vigo
Food Research International | Year: 2010

Salmon is a perishable fish that contains high level of PUFAs (polyunsaturated fatty acids), which have many positive effects on human health, but which are extremely susceptible to oxidation. The development of new food packaging films by incorporation of antioxidants is expected to improve the shelf life of food and thus increase consumer safety and health. Determination of peroxide value (PV), conjugated dienes (CD), conjugated triene hydroperoxides (TH), free fatty acids (FFA), totox value (TV), thiobarbituric acid index (TBARS) and p-anisidine value (AV) by established methods proved suitable for studying lipid hydrolysis and primary and secondary lipid oxidation in samples of salmon during frozen storage. The results obtained confirm the efficacy of natural antioxidants derived from barley husks (NABH) in slowing down lipid hydrolysis and increasing the oxidative stability of salmon flesh. This study demonstrates the potential usefulness of natural antioxidants extracted from barley husks in the development of active packaging films for food preservation. © 2010 Elsevier Ltd.


Cacabelos E.,University of Vigo | Olabarria C.,University of Vigo | Incera M.,Centro Tecnologico del Mar CETMAR | Troncoso J.S.,University of Vigo
Journal of Experimental Marine Biology and Ecology | Year: 2010

Sargassum muticum is an invasive alga that affects biodiversity of benthic communities. Its proliferation in recipient communities may be due to several factors including limited grazing effects by native herbivores ("Enemy Release Hypothesis", ERH). Until now, there is no information about grazing preferences exerted by native herbivores over S. muticum and native seaweeds on the Galician coast. The aim of this study was to determine whether or not different grazers preferred S. muticum compared with native seaweeds. The hypothesis tested was that native meso- and macrograzers would prefer native seaweeds rather than the invasive seaweed S. muticum. Concentrations of polyphenols were also examined to see whether or not these compounds correlated with preferences for types of food. Despite variability of responses within and among herbivorous species, results suggested that grazers preferred native seaweeds over the invasive S. muticum. In most cases, the gastropods Littorina littorea and Aplysia punctata preferred to feed on Ulva sp., whereas L. obtusata fed mostly on Fucus vesiculosus. The sea urchin Paracentrotus lividus, however, showed no preference, feeding indiscriminately on different seaweeds. It is also important to highlight that in many cases, grazers did not show any preference (i.e. consumption when a choice was available could not be differentiated from consumption when there was no choice). These results, therefore, partially supported our prediction and reinforced the notion that well-designed experiments and analyses must be done before preference can be inferred. We suggest that the invader S. muticum is not under substantial pressure from grazers in the area of study. © 2010 Elsevier B.V.

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