Publications: Peer-reviewed journal articles (by staff)

A feeding study to probe the uptake of Maitotoxin by snapper (Pagrus auratus)

  • Kohli GS,
  • Papiol GG,
  • Rhodes L,
  • Harwood DT,
  • Selwood AI,
  • Jerrett A,
  • Murray SA,
  • and Neilan BA
1 July, 2014
CITATION

Kohli GS, Papiol GG, Rhodes LL, Harwood DT, Selwood AI, Jerrett A, Murray SA, Neilan BA 2014. A feeding study to probe the uptake of Maitotoxin by snapper (Pagrus auratus). Harmful Algae. Volume 37, July 2014. Pages 125–132.

ABSTRACT

The role of ciguatoxins (CTX) in Ciguatera fish poisoning (CFP) has been investigated previously, but little is known about Maitotoxin (MTX) and whether it plays a significant role in causing human illness. The MTXs are known to have slightly higher potency than CTXs when administered intraperitoneally in mice, but are less potent when administered orally, due to their water solubility.

 It is not known whether MTXs accumulate in carnivorous fish tissues, and to investigate this further fish feeding trials with snapper (Pagrus auratus)were undertaken. Replicate P. auratus were fed with juvenile mullet (Aldrichetta forsteri) injected with a pellet of a known quantity of Gambierdiscus australes, which is a known producer of MTX. The levels of MTX in different fish tissues were determined using two newly developed sensitive LC-MS/MS assays for MTX that monitor either a specific cleavage fragment (generated from micro-scale oxidation of the intact toxin) or the intact toxin itself.

The investigations revealed the presence of MTX in P. auratus viscera, liver and muscle samples. The presence of Gambierdiscus-related genes in P. auratus digestive organs was confirmed using DNA amplification technology.

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