Parasitic Kudoa inornata causes muscle deterioration in spotted seatrout

Sierra Duca, Goucher College

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This summer I am working at the South Carolina Department of Natural Resources at Fort Johnson under the mentorship of Dr. McElroy and Dr. Isaure de Buron. Being part of an REU program, I am looking forward to gaining some research experience and learning more about career possibilities in the biological sciences. In terms of my research, I am researching the effects of a microscopic parasite, Kudoa inornata, on spotted sea trout (see image below).

Seatrout

Photo source: http://www.kayaking-north-america.com

There are many Kudoa species that infect host fish worldwide. Several of the Kudoa parasites have spores (known as myxospores; see image below) that proliferate inside of the muscle fibers of the host fish (Harrel et al. 1985). In some cases the  parasites wreak havoc on the quality of the meat after the fish dies. For example, infected fish may have unsightly cysts or decreased meat quality (Moran et al.), both of which are unappealing to consumers. Don’t worry, the majority of Kudoa infected fish are not directly harmful if consumed by humans; however, if the deterioration of the muscle tissue is accelerated, like any meat, the quality will decrease sooner as compared to uninfected fish. This process of muscle deterioration is what I am studying with K. inornata infected spotted seatrout. I am looking at the rates of this deterioration during various time frames, from 0 to 6 days after the fish dies, in order to discern if there is a relationship between parasite presence in spotted seatrout and muscle softness.  Ultimately, this research can be used to better understand the biology of K. inornata and to determine the best time frame to consume infected spotted seatrout.

picc     Individual spores of Kudoa inornata (Photo source: Dyková et al., 2009).

Literature Cited

Dyková I, de Buron I, Fiala I, Roumillat WA (2009) Kudoa inornata sp. n. (Myxosporea: Multivalvulida) from the skeletal muscles of Cynoscion nebulosus (Teleostei: Sciaenidae). Folia Parasitology 56: 91-98

Harrel LW, Scott TM (1985) Kudoa thyrsitis (Gilchrist) (Myxosporea: Multivalvulida) in Atlantic salmon, Salmo salar L. Journal of Fish Diseases 8: 329-332

Moran JDW, Whitaker DJ, Kent ML (1999) A review of the myxosporean genus Kudoa Meglitsch, 1947, and its impact on the international aquaculture industry and commercial fisheries. Aquaculture 172: 163-196

Acknowledgments

The Fort Johnson REU Program is funded by the National Science Foundation. This research is made possible through the mentorship of Dr. Eric McElroy and Dr. Isaure de Buron.  In addition, I would like to thank the College of Charleston and the South Carolina Department of Natural Resources for providing the help and facilities necessary for my project.

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