Electronic copies of Aquaculture conference papers and proceedings. http://hdl.handle.net/1893/3486 2026-10-03T07:07:04Z 2026-10-03T07:07:04Z Gheyas, Almas A Rachman, Mifta Bamidele, Oladeji Dessie, Tadelle Smith, Jacqueline Hanotte, Olivier http://hdl.handle.net/1893/36919 2025-03-21T01:32:08Z 2022-01-01T00:00:00Z

Title: 422. Whole genome sequencing reveals genetic diversity and heat-stress adaptation in Nigerian indigenous chickens in "Society - genetics in the tropics" Author(s): Gheyas, Almas A; Rachman, Mifta; Bamidele, Oladeji; Dessie, Tadelle; Smith, Jacqueline; Hanotte, Olivier Editor(s): Veerkamp, R F; de Haas, Y Abstract: Poultry is a crucial sector for the livelihoods and food security of millions of people in Nigeria. Here we present the first large scale whole-genome sequencing analysis on Nigerian indigenous chickens from different agro-climatic conditions, investigating their genetic diversity and adaptation to tropical hot climates. We observe a large genetic diversity but low levels of population differentiation. Selection signature analyses were performed to identify candidate genes in relation to heat-stress adaptation including those specific to extreme hot-humid or hot-arid conditions. These results have important implications for the conservation of genetic diversity and breeding improvement of chickens for thermo-tolerance. Introduction Indigenous livestock populations from different geographic regions constitute important genetic resources for conservation as they represent adaptation to local agro-climatic conditions. Native tropical breeds are particularly crucial, as climate change and global warming is forcing many temperate regions to experience tropic-like conditions and such breeds may hold a genetic solution for climate-resilience.

2022-01-01T00:00:00Z Abdel-Razek, Mohamed A Abozeid, Ahmed M Eltholth, Mahmoud M Abouelenien, Fatma A El-Midany, Sami A Moustafa, Nader Y Mohamed, Radi A http://hdl.handle.net/1893/29970 2025-09-29T03:04:31Z 2019-01-01T00:00:00Z

Title: 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.

2019-01-01T00:00:00Z Viegas, Ivan Trenkner, Lauren H Rito, João Palma, Mariana Tavares, Ludgero C Jones, John G Glencross, Brett D Wade, Nicholas M http://hdl.handle.net/1893/29496 2025-09-29T03:03:50Z 2019-05-01T00:00:00Z

Title: 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.

2019-05-01T00:00:00Z Kay, James W Shinn, Andrew http://hdl.handle.net/1893/25595 2025-10-04T02:02:41Z 2001-01-01T00:00:00Z

Title: 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 other

2001-01-01T00:00:00Z