1,721,060 research outputs found
Impact of the feeding habits of the Great Cormorant Phalacrocorax carbo sinensis on the lagoon fish stocks in central western Sardinia
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Characterization of the Lipid Fraction of Wild Sea Urchin from the Sardinian Sea (Western Mediterranean)
No full textThe fatty acid (FA) composition of Spatangus purpureus, Echinus melo, Sphaerechinus granularis, and Paracentrotus lividus, sea urchins, has been studied. Sea urchins were collected at different depth along Sardinia coast in theMediterranean
sea, and their gonad was measured, separated, and analyzed for FA composition by gas chromatography-mass spectrometry.
A total of 53 FAs were detected, 16 saturated (SFA), 10 monounsaturated (MUFA), 9 polyunsaturated (PUFA), and 13
highly unsaturated (HUFA). Moreover, 5 furan FAs (FFAs) were revealed for the first time in sea urchin. The HUFA and
PUFA classes were the most represented accounting for almost 80% of total FAs. Among these compounds, C20:4 n6
(19.64, 20.52, 23.37, and 8.48 mg/g, respectively) and C22:6 n3 (19.68, 20.05, 3.83, and 1.78 mg/g, respectively) were
the most abundant. The results of principal component analysis indicated that the sea urchin samples could be clearly
discriminated with respect to their FAs composition
Sustainable fishing in the Mediterranean for Bluefin Tuna: a case study of ancestral fishing technologies and contemporary practices
No full textGas chromatographic mass spectrometry determination of geosmin and 2-methylisoborneol off-flavor in Mugil cephalus roe
No full textBotargo is the product of the industrial management of fresh roe of the grey mullet (Mugil cephalus). This food product is actually obtained from wild fish caught in different marine areas around the word. The increasing commercial demand of botargo has brought to carry out different fishing systems, gathering the wild mullet in restricted areas, lagoons, to be caught if necessary. This operating mode has caused the appearance of new problems related to the organoleptic approval by the consumers of fish and derived products, following off-flavor contamination derived from different microorganisms present in the lagoons. The most important off-flavor compounds are represented by 2-methylisoborneol (2-MIB) and geosmin (GSM) which give a muddy/musty smell and flavor to the fish. A simple and easy-to-use GC/MS method for the determination of 2-MIB and GSM has been developed. The method has been validated with the following parameters: instrument limit of detection (LOD) and of quantification (LOQ), precision, recovery, and linearity. The method carried out showed good LOD of 1.0 μg/kg and LOQ 2.0 and 5.0 μg/kg for GSM and 2-MIB, respectively. Validation parameters were in close agreement with those reported in the EC SANCO/12571/2013. Recoveries ranged from 80.2 to 121.4 %, with percent relative standard deviation (RSD%) ranging from 0.6 to 18.6 % in the most unfavorable case. Real sample analysis showed the presence of residues of both off-flavor in all botargo samples analyzed, except for sample S0, while in fresh roe samples, only S7 showed important residues of 2-MIB
Anthropogenic impacts on the bluefin tuna (Thunnus thynnus L.) trap fishery of Sardinia (western Mediterranean)
No full textGas-Chromatographic mass spectrometry determination of geosmin and 2-methylisoborneol off-flavor in Mugil cephalus roe
No full textGC–ITMS analysis of PAH contamination levels in the marine sea urchin Paracentrotus lividus in Sardinia
No full textThis paper describes the results of a two-year monitoring study examining the pollution of the sea urchin
Paracentrotus lividus by polycyclic aromatic hydrocarbons (PAHs) in Sardinia. GC–ITMS analysis of sea
urchin gonads showed the presence of 11 and 12 PAHs in the samples of Capo Pecora, and Capitana,
respectively. Fluorene, naphthalene and its two degradation products, 1-methyl-naphthalene, and
2-methyl-naphthalene, were detected in all samples analyzed. The RPAH residues showed a similar trend
over the two-year sampling period. Furthermore, the residues in the first year were slightly higher than in
the second year. The information obtained by the multivariate statistical analysis PLS-DA allowed for the
determination of samples based on field site and varying habitat types (rocky reef, and Posidonia seabed).
The results of this study showed that Posidonia sea urchins are contaminated by high molecular weight
PAHs and that Capitana samples are more contaminated due to a higher level of human activity in the
area
The effect of Mistral (a strong NW wind) episodes on the occurrence and abundance of Atlantic bluefin tuna (Thunnus thynnus) in the trap fishery of Sardinia (W Mediterranean)
Full text linkFrom April to June Atlantic bluefin tuna, Thunnus thynnus, migrate along the western Sardinian coastline in a southward direction, where they are intercepted by the trap fishery. Fishermen claim that Mistral episodes facilitate the entry of tuna schools towards the traps, thus increasing capture rates. To test the fishermen’s hypothesis we conducted underwater visual counts of tuna in the trap chambers and analysed these data under the effect of wind. The results indicate a “stair-step” pattern in the abundance of tuna, demonstrating that major increases in abundance are associated with the Mistral. The second analytical approach involved a longer time scale to test whether higher Mistral occurrences corresponded to periods when higher captures were recorded. Using a linear regression model we found a significant correlation (p15 knots seemed to have a negative effect on captures. This pattern may be caused by wind-induced advection of coastal waters generating a physical boundary that may have had a deterrent effect on tuna schools
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