Deborah B. Pouder

Common Freshwater Fish Parasites Pictorial Guide: Acanthocephalans, Cestodes, Leeches, & Pentastomes

Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections.

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.

Common Freshwater Fish Parasites Pictorial Guide: Nematodes

Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections.

Common Freshwater Fish Parasites Pictorial Guide: Flagellates

Deborah B. Pouder, Eric W. Curtis, and Roy P. E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections. 

Common Freshwater Fish Parasites Pictorial Guide: Digenean Trematodes

Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections.

Common Freshwater Fish Parasites Pictorial Guide: Monogeneans

Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections.

Harvesting Ornamental Fish From Ponds

Tina C. Crosby, Jeffrey E. Hill, Carlos V. Martinez, Craig A. Watson, Deborah B. Pouder, and Roy P.E. Yanong

Common Freshwater Fish Parasites Pictorial Guide: Dinoflagellates, Coccidia, Microsporidians, & Myxozoans

Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections.

Common Freshwater Fish Parasites Pictorial Guide: Sessile Ciliates

Deborah B. Pouder, Eric W. Curtis, and Roy P. E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections.

Common Freshwater Fish Parasites Pictorial Guide: Crustaceans

Deborah B. Pouder, Eric W. Curtis, and Roy P.E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections. 

Grading Ornamental Fish

Tina C. Crosby, Jeffrey E. Hill, Carlos V. Martinez, Craig A. Watson, Deborah B. Pouder, and Roy P.E. Yanong

Common Freshwater Fish Parasites Pictorial Guide: Motile Ciliates

Deborah B. Pouder, Eric W. Curtis, and Roy P. E. Yanong

This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The information provided in this guide is not intended to be a complete, detailed description of each parasite or parasite group and its characteristics but rather is intended to assist in the visual identification of some of the most common species or groups of parasites seen in freshwater fish. For further information on each parasite, refer to publications in the “Recommended Reading” and “Reference” sections. 

Preparation of Ornamental Fish for Shipping

Tina C. Crosby, Jeffrey E. Hill, Carlos V. Martinez, Craig A. Watson, Deborah B. Pouder, and Roy P.E. Yanong

A UF/IFAS numbered Fact Sheet for Commercial audience(s).

Monogenean Parasites of Fish

Ruth Francis-Floyd, RuthEllen Klinger, Denise Petty, and Deborah Pouder

Monogeneans are a class of parasitic flatworms that are commonly found on fishes and lower aquatic invertebrates. Most monogeneans are browsers that move about freely on the fish’s body surface feeding on mucus and epithelial cells of the skin and gills; however, a few adult monogeneans will remain permanently attached to a single site on the host. Some monogenean species invade the rectal cavity, ureter, body cavity, and even the blood vascular system. Between 4,000 and 5,000 species of monogeneans have been described. They are found on fishes in fresh and saltwater, and in a wide range of water temperatures.

Amonio en sistemas acuáticos

Ruth Francis-Floyd, Craig Watson, Denise Petty y Deborah B. Pouder.

De todos los parámetros de calidad de agua que afectana los peces, el amonio es el más importante después del oxígeno, especialmente en sistemas de cultivo intensivo. Aún en bajas concentraciones, el amonio provoca estrés y daña las branquias y otros tejidos de los peces. Los peces expuestos a niveles bajos de amonio a lo largo de un tiempo son más susceptibles a las infecciones bacterianas, presentan un crecimiento deficiente y no toleran el manejo de rutina tan bien como los peces cultivados en agua libre de amonio. En concentraciones altas, el amonio matará a los peces, y es probable que muchas pérdidas de producción inexplicables hayan sido causadas por amonio disuelto en el agua.

Use of Formalin to Control Fish Parasites

Ruth Francis-Floyd and Deborah B. Pouder

A UF/IFAS numbered Management.

On-Farm Transport of Ornamental Fish

Tina C. Crosby, Jeffrey E. Hill, Carlos V. Martinez, Craig A. Watson, Deborah B. Pouder, and Roy P.E. Yanong

A UF/IFAS numbered Fact Sheet.

Ichthyophthirius multifiliis (White Spot) Infections in Fish

Ruth Francis-Floyd, Roy Yanong, and Deborah Pouder

Ichthyophthirius multifiliis (Ich) is a protozoan parasite that can cause severe losses in aquaculture and aquariums. It is introduced via new fish, substrates, plants, or equipment. Preventive measures include quarantining and treating new fish, holding plants without fish, and disinfecting decorations. Ich can cause rapid, high mortality among fish. Immediate treatment is necessary due to its fast reproduction. Since only the infective theront stage is susceptible to treatment, repeated treatments or prolonged salt use are required. Daily tank cleaning helps remove the parasite. Survivors can carry the parasite and reinfect others. This document is about how effective management and biosecurity practices, including quick treatment and multiple treatments during outbreaks, can help to control Ich and minimize economic losses. First published March 1991.

Ammonia in Aquatic Systems

Ruth Francis-Floyd, Craig Watson, Denise Petty, and Deborah B. Pouder

Management of ammonia, the primary waste product of fish, is critical to fish health, especially in intensive systems. At low concentrations, ammonia causes stress and damages gills and other tissues. Fish exposed to low levels of ammonia over time are more susceptible to bacterial infections, have poor growth, and do not tolerate routine handling well. At higher concentrations, it will kill fish. Many unexplained production losses have likely been caused by ammonia.