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Auteur Li, X.; Blancheton, J.-P.; Liu, Y.; Triplet, S.; Michaud, L.
Titre Effect of oxidation-reduction potential on performance of European sea bass (Dicentrarchus labrax) in recirculating aquaculture systems Type Article scientifique
Année 2014 Publication Revue Abrégée Aquaculture International
Volume 22 Numéro 4 Pages 1263-1282
Mots-Clés culture-system; disinfection; european sea bass; Orp; ozonated; Ozone; performance; Ras; responses; rock lobster; salinity; seawater; sublethal exposure; trout oncorhynchus-mykiss; water-quality
Résumé The direct impact of oxidation-reduction potential (ORP) on fish welfare and water quality in marine recirculating aquaculture systems (RAS) is poorly documented. In this study, the effects of the fish size (S-1, S-2, S-3) and ORP level (normal, four successive levels) on the performance of European sea bass (Dicentrarchus labrax) were investigated. Three size fish were distributed into two RAS (RAS and RAS O-3). Ozone was injected into RAS O-3 to increase the ORP level. The ORP was stabilized to four successive levels: 260-300, 300-320, 320-350, and 300-320 mV in fish tanks during four periods (P1-4). At the last day of each period, the hematological parameters, plasma protein and mortality of sea bass were analyzed. Two-way ANOVA revealed that several hematological parameters, including pH, hematocrit, concentrations of oxygen, carbon dioxide, glucose (Glu), ionized calcium, kalium, and hemoglobin, were significantly influenced by the increased ORP levels over the experimental period. The alteration in blood Glu and plasma protein concentration showed that ORP around 300-320 mV started to stress sea bass. Once the ORP exceeded 320 mV in the tanks during the P-3 period, mortality occurred even when total residual oxidants/ozone-produced oxidants was only 0.03-0.05 mg L-1 in the fish tanks. At the same time, plasma protein decreased notably due to appetite depression. After the decrease in ORP during the P-4 period, mortality continued. In conclusion, the results strongly suggest that for European sea bass in RAS, the ORP should not exceed 320 mV in the tanks. Once ozonation damaged fish, the effect seemed to be irreversible. However, how ORP affected related hematological parameters still need the further investigations.
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ISSN 0967-6120 ISBN Médium
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Notes <p>ISI Document Delivery No.: AL4MD<br/>Times Cited: 1<br/>Cited Reference Count: 35<br/>Li, Xian Blancheton, Jean-Paul Liu, Ying Triplet, Sebastien Michaud, Luigi<br/>National Natural Science Foundation of China [41306152]; National Science and Technology Support Program [2011BAD13B04]<br/>The authors would thank all the participants from the Ifremer Palavas station: Cyrille Przybyla, Myriam Callier, and Thibault Geoffroy for their contribution to the experiment and analyses. This work was supported by the National Natural Science Foundation of China (Grant No. 41306152) and National Science and Technology Support Program (Grant No. 2011BAD13B04).<br/>Springer<br/>Dordrecht</p> Approuvé pas de
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Auteur Moreau, S.; Mostajir, B.; Bélanger, S.; Schloss, I.R.; Vancoppenolle, M.; Demers, S.; Ferreyra, G.A.
Titre Climate change enhances primary production in the western Antarctic Peninsula Type Article scientifique
Année 2015 Publication Revue Abrégée Glob Change Biol
Volume 21 Numéro 6 Pages 2191-2205
Mots-Clés ozone hole; photoinhibition; primary production; regional warming; sea ice; seawater temperature; ultraviolet radiation
Résumé Intense regional warming was observed in the western Antarctic Peninsula (WAP) over the last 50 years. Here, we investigate the impact of climate change on primary production (PP) in this highly productive region. This study is based on temporal data series of ozone thickness (1972–2010), sea ice concentration (1978–2010), sea-surface temperature (1990–2010), incident irradiance (1988–2010) and satellite-derived chlorophyll a concentration (Chl-a, 1997–2010) for the coastal WAP. In addition, we apply a photosynthesis/photoinhibition spectral model to satellite-derived data (1997–2010) to compute PP and examine the separate impacts of environmental forcings. Since 1978, sea ice retreat has been occurring earlier in the season (in March in 1978 and in late October during the 2000s) while the ozone hole is present in early spring (i.e. August to November) since the early 1990s, increasing the intensity of ultraviolet-B radiation (UVBR, 280–320 nm). The WAP waters have also warmed over 1990–2010. The modelled PP rates are in the lower range of previously reported PP rates in the WAP. The annual open water PP in the study area increased from 1997 to 2010 (from 0.73 to 1.03 Tg C yr−1) concomitantly with the increase in the production season length. The coincidence between the earlier sea ice retreat and the presence of the ozone hole increased the exposure to incoming radiation (UVBR, UVAR and PAR) and, thus, increased photoinhibition during austral spring (September to November) in the study area (from 0.014 to 0.025 Tg C yr−1). This increase in photoinhibition was minor compared to the overall increase in PP, however. Climate change hence had an overall positive impact on PP in the WAP waters.
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