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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 Elleouet, J.; Albouy, C.; Ben Rais Lasram, F.; Mouillot, D.; Leprieur, F.
Titre A trait-based approach for assessing and mapping niche overlap between native and exotic species: the Mediterranean coastal fish fauna as a case study Type Article scientifique
Année 2014 Publication Revue Abrégée Diversity and Distributions
Volume 20 Numéro 11 Pages 1333-1344
Mots-Clés Biological invasions; coastal fishes; endemic species; exotic species; functional traits; Mediterranean Sea; niche overlap
Résumé Aim We propose a trait-based approach for assessing and mapping potential niche overlap between native and exotic species at large spatial scales. Location The Mediterranean Sea. Methods We developed two complementary indices based on ecological, biological and ecomorphological similarities between native and exotic species. The first index (FNNr) allows identifying areas where native species are the most at risk in terms of potential ecological interactions with exotic species. The second index (FGO) is species-specific and allows identifying native species that display the broadest functional niche overlap and range overlap with exotic species. We illustrated our approach using the Mediterranean coastal fish fauna as a case study. Results We found that endemic and exotic fishes had a similar global functional niche at the Mediterranean scale, that is, they filled the same functional space defined by trait axes. FNNr hotspots were found to be moderately congruent with exotic species richness hotspots. Higher values of FNNr were observed along the coasts of the Levantine Sea. The computation of the FGO index showed that the geographical range of a given endemic species overlapped in average with 52 exotic species. Species showing the highest FGO values displayed localized and/or fragmented distributions in the eastern Mediterranean basin. Main conclusions Our findings suggest that the number of exotic species alone cannot be used as a broad-scale indicator of potential impact because this metric does not account for functional relatedness between native and exotic species. The trait-based indices developed in this study can be used for other taxa in both aquatic and terrestrial ecosystems and should help environmental managers to set up local-scale studies on areas where the potential impact of exotic species on native biodiversity is the highest.
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ISSN 1472-4642 ISBN Médium
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Auteur Chu, T.V.; Torréton, J.-P.; Mari, X.; Nguyen, H.M.T.; Pham, K.T.; Pham, T.T.; Bouvier, T.; Bettarel, Y.; Pringault, O.; Bouvier, C.; Rochelle-Newall, E.
Titre Nutrient ratios and the complex structure of phytoplankton communities in a highly turbid estuary of Southeast Asia Type Article scientifique
Année 2014 Publication Revue Abrégée Environ Monit Assess
Volume 186 Numéro 12 Pages 8555-8572
Mots-Clés Hab; Phytoplankton diversity; Southeast Asia; vietnam
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ISSN 0167-6369 ISBN Médium
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Auteur Cheng, L.; Blanchet, S.; Loot, G.; Villeger, S.; Zhang, T.; Lek, S.; Lek-Ang, S.; Li, Z.
Titre Temporal changes in the taxonomic and functional diversity of fish communities in shallow Chinese lakes: the effects of river–lake connections and aquaculture Type Article scientifique
Année 2014 Publication Revue Abrégée Aquatic Conservation: Marine and Freshwater Ecosystems
Volume 24 Numéro 1 Pages 23-34
Mots-Clés biodiversity loss; biotic homogenization; Functional richness; lakes; Yangtze River basin
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ISSN 1099-0755 ISBN Médium
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Auteur Avarre, J.-C.; Guinand, B.; Dugué, R.; Cosson, J.; Legendre, M.; Panfili, J.; Durand, J.-D.
Titre Plasticity of gene expression according to salinity in the testis of broodstock and F1 black-chinned tilapia, Sarotherodon melanotheron heudelotii Type Article scientifique
Année 2014 Publication Revue Abrégée PeerJ
Volume 2 Numéro Pages
Mots-Clés Acclimation; fish; Gene expression; Male reproduction; salinity
Résumé The black-chinned tilapia Sarotherodon melanotheron heudelotii Rüppell 1852 (Teleostei, Cichlidae) displays remarkable acclimation capacities. When exposed to drastic changes of salinity, which can be the case in its natural habitat, it develops quick physiological responses and keeps reproducing. The present study focused on the physiological impact of salinity on male reproductive capacities, using gene expression as a proxy of acclimation process. Two series of experimental fish were investigated: the first one was composed of fish maintained in freshwater for several generations and newly acclimated to salinities of 35 and 70, whereas the second one consisted of the descendants of the latter born and were raised under their native salinity. Expression patterns of 43 candidate genes previously identified from the testes of wild males was investigated in the three salinities and two generations. Twenty of them showed significant expression differences between salinities, and their predicted function revealed that most of them are involved in the osmotic tolerance of sperm cells and/or in the maintenance of sperm motility. A high level of expression variation was evidenced, especially for fish maintained in freshwater. In spite of this, gene expression patterns allowed the differentiation between fish raised in freshwater and those maintained in hypersaline water in both generations. Altogether, the results presented here suggest that this high variability of expression is likely to ensure the reproductive success of this species under varying salinities.
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ISSN 2167-8359 ISBN Médium
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