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Larsen R.,Nofima Marine | Larsen R.,University of Tromsø | Mierke-Klemeyer S.,Max Rubner Institute | Maehre H.,University of Tromsø | And 8 more authors.
Archiv fur Lebensmittelhygiene | Year: 2010

Ice-storage is the most common method of preserving fresh fish. The aim of this work was to study whether ice storage had an effect on contents of selenium, taurine and fatty acid composition in farmed African catfish (Clarias gariepinus). Gutted fish (n = 40) were stored in melting ice for 21 days, and 5 fish were at regular time intervals randomly drawn from the pool, filleted and freeze-dried. The samples were analyzed for contents of selenium, taurine and fatty acids. During ice storage, water content of fillets increased due to influx of water from melted ice. Only concentrations of water soluble taurine were found to decrease significantly, approximately 25 %, whereas concentration of selenium and the fatty acid profile did not substantially change during storage. © M. & H. Schaper GmbH & Co. ISSN 0003-925X.


Rune L.,Nofima Marine | Rune L.,University of Tromsø | Sabine M.-K.,Max Rubner Institute | Hanne M.,University of Tromsø | And 8 more authors.
Archiv fur Lebensmittelhygiene | Year: 2010

Changes in content of selenium and taurine, and the alteration of fatty acid profile have been studied in African catfish fillets subjected to a commercial cold- or hot smoking process. Selenium content and the fatty acid profile did not change significantly during neither of the smoking procedures. Losses of taurine were 32 % and 19 % during cold-smoking and hot-smoking, respectively. Significantly more taurine was lost during cold-smoking (P < 0.05), probably due to the prolonged brining and smoking procedure. The results support conclusions from other studies, showing that low molecular water soluble components are more susceptible to losses during processing of seafood. © M. 81 H. Schaper GmbH & Co.


Vethaak A.D.,Deltares | Vethaak A.D.,VU University Amsterdam | Jol J.G.,Institute of Marine Resources and Ecosystem Studies IMARES | Martinez-Gomez C.,Spanish Institute of Oceanography
Integrated Environmental Assessment and Management | Year: 2011

Epizootic skin diseases in euryhaline flounder (Platichthys flesus) in the Dutch Wadden Sea were first reported in 1988. Particularly high prevalences of skin ulcers (up to one-third of individual fish being affected) were encountered in the vicinity of sluices draining freshwater from IJsselmeer Lake, in contrast with much lower levels in the freshwater bodies behind the sluices and open sea areas (<2%). It was proposed that salinity stress, high bacterial loads, nutritional deficiencies, and obstruction to fish migration by the sluices could all be involved in disease causation. Results of follow-up surveys at these outlet sluices from 1994 to 2005 further substantiate our preliminary findings. The follow-up data also show a general reduction in disease and improved condition factor during this period, which can be explained by improved habitat conditions for the flounder, partly due to effective sluice gate management. Furthermore, statistical correlations (p<0.05) were demonstrated between flounder ulcer occurrence and chemical contaminant concentrations in liver (Hg, Cd, Cu, Zn) and bile (the metabolite 1-OH pyrene as an indicator of chronic polycyclic aromatic hydrocarbon exposure), and histological liver lesions generally indicative of contaminant exposure (hydropic vacuolization of biliary duct epithelial cells). The findings suggest that a combination of osmotic and contaminant-induced stress also contributed to the observed disease patterns. © 2011 SETAC.

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