Uptake of Paralytic Shellfish Toxins by Blacklip Abalone (Haliotis rubra rubra Leach) from direct exposure to Alexandrium catenella microalgal cells and toxic aquaculture feed.

Harmful Algae
Andreas SegerAlison Turnbull

Abstract

The Tasmanian abalone fishery represents the largest wild abalone resource in the world, supplying close to 25% of the annual wild-caught global harvest. Prompted by the need to manage Paralytic Shellfish Toxin (PST) contamination of Blacklip Abalone (Haliotis rubra rubra) from east coast Tasmania, the uptake of toxins by this species is investigated in a land-based, controlled aquaculture setting. Abalone were exposed to either live Alexandrium catenella microalgal cultures or PST contaminated feed pellets during a 28 day exposure period and toxins quantified in viscera, foot muscle and epipodium tissues. PST profiles of abalone foot tissues were dominated by saxitoxin and neosaxitoxin, whilst viscera more closely resembled those of the toxin source (A. catenella cells rich in gonyautoxin 1&4 and 2&3 or feed pellets containing A. catenella extracts rich in these analogues). This indicates direct uptake of PST in the viscera via browsing/grazing on the pellet and /or sedimented microalgal cells. After exposure to A. catenella cell culture, PST concentrations in the foot (muscle + epipodium) were on average 8 times higher than in the viscera. Higher toxicity of foot tissue was caused by higher PST content of the epipodium (up to...Continue Reading

References

Oct 27, 2004·Toxicon : Official Journal of the International Society on Toxinology·Alison RobertsonAndrew Negri
Apr 24, 2010·Epidemiology and Infection·K J JamesZ Skrabáková
Aug 25, 2010·Toxicon : Official Journal of the International Society on Toxinology·Nora G MontoyaJosé I Carreto
Jun 7, 2011·Toxicon : Official Journal of the International Society on Toxinology·Natalie DowsettCatherine McLeod
Mar 31, 2012·Annual Review of Marine Science·Donald M AndersonGustaaf M Hallegraeff
Apr 3, 2012·Toxicon : Official Journal of the International Society on Toxinology·Marielle GuéguenPatrick Lassus
Aug 27, 2014·Toxicon : Official Journal of the International Society on Toxinology·D Tim HarwoodCatherine McLeod
Nov 5, 2014·Journal of Food Protection·Navreet MalhiCatherine McLeod

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