Clearance of a dermal Huffmanela sp. in a sandbar shark (Carcharhinus plumbeus) using levamisole

Robert A. MacLean, Michael H. Fatzinger, Kevin D Woolard, Craig A. Harms

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A wild-caught captive sandbar shark Carcharhinus plumbeus developed a contiguous network of darkly pigmented linear tracks that progressed from the snout to the ventral cervical region. Microscopic examination of a skin scraping revealed nematode eggs of the genus Huffmanela, a group of histozoic nematodes that is known to parasitize requiem sharks and marine and freshwater teleosts. The fresh eggs were darkly pigmented with bipolar plugs, contained a larva, and measured 73.3 to 86.4 by 39.0 to 47.4 μm (n = 10). Formalin-fixed and paraffin-embedded eggs were significantly smaller (Wilcoxon rank sums test, p < 0.005), measuring 70.5 to 78.9 by 33.6 to 41.3 μm (n = 13). These measurements do not correlate with previously reported species of Huffmanela. Serial treatment with levamisole (10 mg kg-1, intramuscular [i.m.]) cleared the egg tracks within 21 d, with no recurrence or apparent complications.

Original languageEnglish (US)
Pages (from-to)83-88
Number of pages6
JournalDiseases of Aquatic Organisms
Volume73
Issue number1
StatePublished - Nov 21 2006
Externally publishedYes

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Keywords

  • Carcharhinus plumbeus
  • Elasmobranchii
  • Huffmanela
  • Levamisole
  • Parasitic nematode

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology

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