STORRE Collection: Electronic copies of Aquaculture conference papers and proceedings.Electronic copies of Aquaculture conference papers and proceedings.http://hdl.handle.net/1893/34862024-03-29T09:26:47Z2024-03-29T09:26:47ZBioremediation of a pesticide and selected heavy metals in wastewater from various sources using a consortium of microalgae and cyanobacteriaAbdel-Razek, Mohamed AAbozeid, Ahmed MEltholth, Mahmoud MAbouelenien, Fatma AEl-Midany, Sami AMoustafa, Nader YMohamed, Radi Ahttp://hdl.handle.net/1893/299702021-04-23T09:49:32Z2019-01-01T00:00:00ZTitle: Bioremediation of a pesticide and selected heavy metals in wastewater from various sources using a consortium of microalgae and cyanobacteria
Author(s): Abdel-Razek, Mohamed A; Abozeid, Ahmed M; Eltholth, Mahmoud M; Abouelenien, Fatma A; El-Midany, Sami A; Moustafa, Nader Y; Mohamed, Radi A
Abstract: The presence of organophosphate pesticides and heavy metals in water are known to be toxic to aquatic organisms. Bioremediation makes use of naturally-occurring organisms to remove pollutants from the environment. This study explored the potential of using a consortium of microalgae and cyanobacteria (Chlorella vulgaris, Scenedesmus quadricuda and Spirulina platensis) to remove the organophosphate pesticide malathion and the heavy metals cadmium, nickel and lead from water samples taken from varying combinations of urban wastewater and agricultural drainage water in Egypt. The fastest algal growth observed in this study was in a treatment containing the microorganismal consortium, malathion and heavy metals cultured in water samples taken from agriculture drainage and urban wastewater. Microalgae in this study were able to remove malathion from samples of wastewater with up to 99% efficacy and were able to bioaccumulate nickel at up to 95% efficacy. Moreover, microalgae demonstrated the ability to uptake lead and cadmium at up to 89% and 88% efficacy respectively. The results from this study suggest that a consortium of Chlorella vulgaris, Scenedesmus quadricuda and Spirulina platensis can be effective in remediating the pesticide malathion and the heavy metals cadmium, lead and nickel from wastewater.2019-01-01T00:00:00ZImpact of dietary starch on extrahepatic tissue lipid metabolism in farmed European (Dicentrarchus labrax) and Asian seabass (Lates calcarifer)Viegas, IvanTrenkner, Lauren HRito, JoãoPalma, MarianaTavares, Ludgero CJones, John GGlencross, Brett DWade, Nicholas Mhttp://hdl.handle.net/1893/294962021-04-23T14:21:31Z2019-05-01T00:00:00ZTitle: Impact of dietary starch on extrahepatic tissue lipid metabolism in farmed European (Dicentrarchus labrax) and Asian seabass (Lates calcarifer)
Author(s): Viegas, Ivan; Trenkner, Lauren H; Rito, João; Palma, Mariana; Tavares, Ludgero C; Jones, John G; Glencross, Brett D; Wade, Nicholas M
Abstract: In aquaculture, there is high interest in substituting marine-derived with vegetable-based ingredients as energy source. Farmed carnivorous fish under high carbohydrate diets tend to increase adiposity but it remains unclear if this happens by increased lipid retention/accumulation, promotion of lipogenic pathways, or both. In order to determine the response of extrahepatic tissue to dietary starch, European (Dicentrarchus labrax) and Asian (Lates calcarifer) seabass were fed a control (low starch; LS) or experimental (high starch; HS) diet, for at least 21 days and then transferred for 6 days to saltwater enriched with deuterated water 2H2O. Incorporation of 2H-labelling follows well-defined metabolic steps, and analysis of triacylglycerols (TAG) 2H-enrichment by 2HNMR allowed evaluation of de novo lipogenesis (DNL) in muscle and visceral adipose tissue (VAT). Fractional synthetic rates for TAG-bound fatty acids and glycerol were quantified separately providing a detailed lipogenic profile. The FA profile differed substantially between muscle and VAT in both species, but their lipogenic fluxes revealed even greater differences. In European seabass, HS promoted DNL of TAG-bound FA, in muscle and VAT. High 2H-enrichment also found in muscle TAG-bound glycerol was indicative of its role on lipid cycling. In Asian seabass, HS had no effect on muscle FA composition and lipogenic flux, with no 2H-enriched TAG being detected. VAT on the other hand revealed a strong enhancement of DNL in HS-fed fish along with high TAG-bound glycerol cycling. This study consolidated the use of 2H2O as tracer for fish lipid metabolism in different tissues, under different dietary conditions and suitable to use in different fish models.2019-05-01T00:00:00ZDiscrimination of gyrodactylids based on landmark dataKay, James WShinn, Andrewhttp://hdl.handle.net/1893/255952021-05-09T01:37:16Z2001-01-01T00:00:00ZTitle: Discrimination of gyrodactylids based on landmark data
Author(s): Kay, James W; Shinn, Andrew
Editor(s): Mardia, KV; Aykroyd, RG
Abstract: First paragraph: There are many different species of the genus Gyrodactylus. One particular form, Gyrodactylus salaris, is known to be highly pathogenic to stocks of Atlantic salmon, whereas other species that infect salmonids have a generally low pathogenicity. Gyrodactylus salaris is responsible for the catastrophic decline in salmon stocks in Norway and has been demonstrated to be widespread in Norwegian rivers. It has also caused problems in Portugal and France. In order to prevent its entry into the UK, G. salaris was made a notifiable disease in 1988 under the 1937 and 1983 Diseases of Fish Acts of the UK. While the UK is thought to be free of G. salaris there is another species, G. thymalli which has been found in the UK and some think is a variant of G. salaris. It is important to find a means of identification of G. salaris via routine microscopic monitoring of samples of parasites. Hence the main motivation for this work is the development of a statistical method which could be used to discriminate G. salaris from other species of Gyrodactylus, while a secondary aim is the discrimination of the other species of Gyrodactylus from each other2001-01-01T00:00:00ZAn approach to study the nutritional requirements of the bluefin tuna (Thunnus thynnus thynnus L.)Mourente, GabrielTocher, Douglas Rhttp://hdl.handle.net/1893/28972021-05-06T16:26:48Z2003-01-01T00:00:00ZTitle: An approach to study the nutritional requirements of the bluefin tuna (Thunnus thynnus thynnus L.)
Author(s): Mourente, Gabriel; Tocher, Douglas R
Editor(s): Bridges, CR; Garcia, A; Gordin, H
Abstract: The research required in relation to the nutrition of bluefin tuna (BFT) is great. In previous trials in the domestication of large scombrids and in current capture-fattening schemes, nutritional studies have been few. Therefore, virtually nothing is presently known about the nutritional requirements for these species. Nutritional factors are important in any domestication programme in a variety of areas. Correct nutrition is a vital factor in the production of a successful broodstock with high fecundity and fertility producing large numbers of high quality eggs. Reproductive control itself is affected by nutritional factors such as lipid/energy content which can influence sexual maturation in other fish species. Successful larval rearing of marime fish is highly dependent upon suitable diets, whether live prey species or artificial, and their precise composition particularly in relation to fatty acids is an area that still demands much research for all marine species. Clues to the nutritional requirements of any animal can be obtained by looking at the natural food for that animal, in this instance, the natural prey species of the BFT and also by determining the composition of wild caught animals, both prey and predator. The latter certainly being a source of information in terms of lipids and fatty acid requirements. The few data available from previous trials can also add to the overall view. In this section we will briefly review the literature on what is known about the nutrition of the large scombrids and also, importantly, place the problems of their feeding and nutrition in a global perspective.2003-01-01T00:00:00Z