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Thomas B. Waltzek

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Thomas B. Waltzek

Orcid ID0000-0001-6383-5978

Specialist

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Publications

thumbnail for publication: Carp Edema Virus Disease (CEVD) / Koi Sleepy Disease (KSD)

Carp Edema Virus Disease (CEVD) / Koi Sleepy Disease (KSD)

Shohreh Hesami, Pedro Viadanna, Natalie Steckler, Staci Spears, Patrick Thompson, Karen Kelley, Roy Yanong, Ruth Francis-Floyd, Johnny Shelley, Joseph Groff, Andy Goodwin, Olga Haenen, and Thomas Waltzek

Carp edema virus disease is killing wild and cultured varieties of carp and worrying koi enthusiasts and carp aquaculturists in the United States and around the world. The disease causes skin lesions and swelling and is sometimes called “koi sleepy disease” because infected fish become lethargic and unresponsive. This 6-page fact sheet describes symptoms, diagnosis, prevention, and what fish producers, wholesalers, or retailers can do if they suspect carp may have contracted the disease.

thumbnail for publication: Koi Herpesvirus Disease (KHVD)

Koi Herpesvirus Disease (KHVD)

Kathleen H. Hartman, Roy P.E. Yanong, Deborah B. Pouder, B. Denise Petty, Ruth Francis-Floyd, Allen C. Riggs, and Thomas B. Waltzek

Koi herpesvirus (KHV) is a highly contagious virus that causes significant morbidity and mortality in common carp varieties. Common carp is raised as a foodfish in many countries and has also been selectively bred for the ornamental fish industry where it is known as koi. The first recognized case of KHV occurred in the United Kingdom in 1996. Since then other cases have been confirmed in almost all countries that culture koi and/or common carp with the exception of Australia. This fact sheet is intended to inform veterinarians, biologists, fish producers and hobbyists about KHV disease.

thumbnail for publication: Diagnostic Methods for the Comprehensive Health Assessment of the Long-Spined Sea Urchin, Diadema antillarum

Diagnostic Methods for the Comprehensive Health Assessment of the Long-Spined Sea Urchin, Diadema antillarum

Ruth Francis-Floyd, Jan Landsberg, Roy Yanong, Yasu Kiryu, Shirley Baker, Deborah Pouder, William Sharp, Gabriel Delgado, Nicole Stacy, Tom Waltzek, Heather Walden, Roxanna Smolowitz, and Greg Beck

This 55-page document contains a wealth of information on the long-spined sea urchin, which is an important animal in coral reef ecosystems. The publication discusses diagnostic methods for Diadema antillarum and provides reporting forms for laboratory and diagnostic work.

thumbnail for publication: Megalocytivirus Infections in Fish, with Emphasis on Ornamental Species

Megalocytivirus Infections in Fish, with Emphasis on Ornamental Species

Roy P. E. Yanong and Thomas B. Waltzek

This document is about megalocytiviruses, a group of fish viruses in the family Iridoviridae, which cause systemic infections in various freshwater and marine fish species1. It details the disease symptoms, diagnostic methods, and management practices for infected fish. The document also highlights the susceptibility of different fish species to these viruses and the importance of biosecurity measures to prevent the spread of infections. Additionally, it discusses the lack of effective treatments and the necessity of good husbandry practices to mitigate the impact of these viruses. First published Dec. 2010.

thumbnail for publication: Tilapia Lake Virus (TiLV): a Globally Emerging Threat to Tilapia Aquaculture

Tilapia Lake Virus (TiLV): a Globally Emerging Threat to Tilapia Aquaculture

Lowia Al-Hussinee, Kuttichantran Subramaniam, Win Surachetpong, Vsevolod Popov, Kathleen Hartman, Katharine Starzel, Roy Yanong, Craig Watson, Hugh Ferguson, Salvatore Frasca Jr., and Thomas Waltzek

A UF/IFAS numbered peer reviewed Fact Sheet. in support of UF/IFAS Extension program: Aquaculture