1 / 9

Overview of Neascus spp. ( Diplostomatidae )

Overview of Neascus spp. ( Diplostomatidae ). Paul Schiller. Background. Neascus is a digenean trematode that most often infects centrarchid , & cyprinid fish species, some salmonids as juveniles ( FW ) Parasite has three stages (egg, larvae, & adult)

shanta
Download Presentation

Overview of Neascus spp. ( Diplostomatidae )

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Overview of Neascus spp. (Diplostomatidae) Paul Schiller

  2. Background • Neascus is a digeneantrematode that most often infects centrarchid, & cyprinid fish species, some salmonidsas juveniles (FW) • Parasite has three stages (egg, larvae, & adult) • Also known as black spot disease • Wide distribution-N.America

  3. Hosts Neascus spp. has complex life cycle that begins as an egg immersed in water • Forms juvenile larvae that uses gastropodamolluscs as a host (miracidium) • Fish are intermediate host (metacercariae) • Piscivorous birds become infected Cycle begins again after infected bird feces reach water

  4. Life Cycle Final host

  5. Impacts on fish • Larval form “burrows” into the skin and tissue. • Often not harmful to fish, except when fluke is in high densities, or near vital organs • Immune response creates the cyst that forms around invading fluke Neascus cyst on skin Encysted metacercariae

  6. Impacts cont. • Sportfishing industry prefers “natural fish” • License sales • Shallow, warmer, eutrophic water bodies more susceptible to infestation

  7. Management • Preventing introduction to water sources • Early hatchery operations enclosed • Baitfish industry and spread of minnows • Most current research into more dangerous metacercarciae

  8. Potential Risk • Not harmful to humans if not cooked properly • Can be harmful to gastrointestinal tract if not cooked • Spread of live fish and carcasses is vector for disease spread • Wild adult fish are adaptable, and may be a cryptic advantage

  9. Literature cited • Zimmermann, M., & Ingold, D. J. (2008). Parasite loads in three sunfish species (Lepomis sp.) on reclaimed mine ponds in Southeastern Ohio. Ohio Journal of Science, 108(1), A-22 • Dechiar, Alex (2011). Parasites of fish from Lake of the Woods, Ontario. Journal of the Fisheries Research Board of Canada, 1972, 29(3): 275-283, 10.1139/f72-046

More Related