15,934 research outputs found
Gill disease in barramundi (Lates calcarifer)
No full textDisease is a major impediment to world aquaculture, amplified by the increase of the intensity of aquaculture relieving pressure from over depleted wild stocks, but with intensity brings disease and particularly disease of the fragile gill organ, exposed directly to the water environment. There is little literature on barramundi biology and the various forms of culture impacting on health, particularly the gill and much research is required in gaining a further understanding of this popular eating fish.
The light microscope is a pivotal tool with cytology and histology mandatory in assessing gill health. The gill biopsy should be considered part of a clinical examination as the water medium surrounding the gill and on the gill contains often fragile organisms that would otherwise be lost in fixation for histology alone, but easily viewed with cytology. Barramundi are easily anaesthetised and recovered like many terrestrials and gill re-growth is rapid, healing within days. Biopsies should be viewed unstained with and without phase contrast and then stained and reviewed, recognizing some ectoparasites maybe lost with anaesthetic agents and stains. The sacrificing of the fish after a live gill biopsy is necessary with histology and microbiology our major tools for diagnostics, with no other non invasive methods readily available as for terrestrials. Every year many new water organisms related to aquaculture are described in the literature and the finding of novel and new organisms makes the veterinary examination of the live fish exciting yet imperative.
A major concern is the gill pathogens found in wild barramundi were similar to those found in culture. For example the prevalence of the parasite Henneguya a Myxosporidean was 90% in sea cages 60 km offshore from Darwin in the Bathurst Island river system and 66% for ponded fish with water drawn from the Darwin Elizabeth river, compared to 33% infected in the wild habitat of the Mary river system close to Darwin by road. However the bacterial disease Epitheliocystis had a prevalence of 66% in the sea cages and 18% of similarly sized fish in the Mary river system, yet nil found in the pond farm, but in this case sample numbers were restricted. Consequently the surveillance for new fish pathogens and monitoring for existing pathogens in the wild ecosystems and aquaculture facilities is necessary and must include the macro and micro flora and fauna surrounding such facilities as they are potentially affected from aquaculture waste streams. The sustainability of aquaculture in open water culture must be considered with great concern for many reasons, but disease by its nature could overwhelm a species and other aquatic life quickly disseminated in a dynamic water medium.
Freshwater culture of barramundi has problems with off flavour and disease, particularly recirculating aquaculture systems due to undercapitalization and possibly at this stage with existing type farms not suited for the culture of barramundi with one farm having all fish sampled diagnosed with systemic bacteraemia and gill Epitheliocystis. Commonly fish sampled from freshwater culture had suffered pathological changes to the gill, particularly hyperplasia indicating the fish are continually affected by issues of water quality and disease.
Pond culture appeared to control gill disease issues by affording lower stocking rates, high water exchanges from a river within metres, fallow and the flavour of the fish similar to wild catch or sea cage culture, when purged in brackish water. The decreased environmental and ecosystem risks, coupled with the pond farmer reporting good profits with a simple form of culture, also suitable for intensification is a success story for barramundi production for today and the future
Tracy Gill
No full textTracy Gill works for NASA at the Kennedy Space Center (KSC). He has over twenty five years of experience on space shuttle payloads and on space station elements and experiment payloads gaining valuable experience doing “hands-on” work on flight and ground support hardware and working with people from all over the United States and the world. He currently supports the NASA NextSTEP (Next Space Technologies for Exploration Partnerships) project for Deep Space Gateway. He also manages the X-Hab Academic Innovation Challenge for NASA.
Tracy holds a BS in Electrical Engineering and an MS in Aerospace and Mechanical Systems from the University of Florida, an MS in Space Systems from Florida Tech, and is a graduate of the International Space University Summer Session Program in 2006. He is also an adjunct professor for the International Space University.https://commons.erau.edu/space-congress-bios-2018/1036/thumbnail.jp
[Cover for Victoria gold diggings and diggers as they are. Part 2] [picture] /
No full textExhibited: 34zBAustralian Sketchbook: Colonial Art and the art of S.T. Gill34yB, State Library of Victoria – 17 July – 18 October 2015; Exhibited: Gold and Civilisation, National Museum of Australia, Canberra, March - June 2001.; S130 pink paper, with ms. inscription bot. c. "by Stephen [sic] Thomas Gill"; S165 green paper
Interview with Alice Anderson Gill - OH 043
No full textMs. Gill discusses her education at Winthrop and recollections of her father, John Gary Anderson, owner of the Rock Hill Buggy Company and founder of the Anderson Motor Car Company. Subjects include recollections about Mr. Anderson’s childhood, his Rock Hill Plan for raising the price of cotton in South Carolina and his founding, development and closing of the Anderson Motor Car Company. Mr. Anderson also wrote his autobiography and another book about Rock Hill titled City without Cobwebs.https://digitalcommons.winthrop.edu/oralhistoryprogram/1099/thumbnail.jp
Ms. Courtney Chartier, RWWL AUC, August 2011
No full textThis video is a conversation with Ms. Courtney Chartier. Ms. Chartier talks about her work on the "New Georgia Encyclopedia" and "Online Voter Education Project." Andrea Jackson, AUC Woodruff Library, is the interviewer
Ms. Neely Terrell, RWWL AUC, March 2012
No full textThis video is a conversation with Ms. Neely Terrell. Ms. Terrell talks about her book, "Super Singles Activate". Anthony Kinsey and Jahnesta Horney, AUC Woodruff Library, are the interviewers
Personal Papers (MS 80-0002)
No full textLetter from A. H. Blackshear, Jr., to Gill, Jones, & Tyler, Trustees, discussing the account of Fannie K. Adoue
Personal Papers (MS 80-0002)
No full textLetter from Harris L. Kempner to W. H. Gill notifying them of the end of their lease and the steps that should've been taken
Ms. Felesha Love, Spelman College, January 2016
No full textThis video is a conversation with Felesha Love. Ms. Love talks about her book, "Brave Leap to Freedom: Integrating Mind, Body, and Spirit to Cultivate Healthy Relationships". Jordan Moore, AUC Woodruff Library, is the interviewer
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