First report of Kudoa thunni and Kudoa musculoliquefaciens affecting the quality of commercially harvested yellowfin tuna and broadbill swordfish in Eastern Australia.

Parasitology Research
Jessica A BolinKylie L Scales

Abstract

Recent anecdotal reports from seafood processors in eastern Australia have described an increased occurrence of post-mortem myoliquefaction ('jellymeat') in broadbill swordfish Xiphias gladius, and macroscopic cysts throughout the musculature of yellowfin tuna Thunnus albacares. A genus of parasitic cnidarians, Kudoa (Myxosporea, Multivalvulida), species of which are known to occur in economically important wild-caught fish species globally, can cause similar quality-deterioration issues. However, Kudoa sp. epizootiology within commercially harvested, high-value fish caught within Australia is poorly understood, despite the parasite's economic importance. To determine the causative agent responsible for the observed quality deterioration in swordfish and yellowfin tuna, muscle-tissue samples from seafood processors in Mooloolaba, Australia, collected from October 2019-February 2020, were examined for parasitic infection. Kudoid myxospores were identified from both hosts and were subquadrate in shape, with four equal-sized polar capsules. The SSU rDNA sequences from both fish shared > 99% identity to Kudoa species. Kudoa musculoliquefaciens was isolated from 87.1% of swordfish sampled, suggesting that it is a widespread parasite...Continue Reading

References

Jul 18, 2001·The Journal of Eukaryotic Microbiology·M L KentC Xiao
Jun 21, 2006·Systematic Biology·Maria Anisimova, Olivier Gascuel
Apr 22, 2008·Nucleic Acids Research·A DereeperO Gascuel
Jan 28, 2012·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Takao KawaiTakahiro Ohnishi
Jan 30, 2014·Systematic Parasitology·Jorge Costa EirasCristina Cruz

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Software Mentioned

Jellymeat
PhyML
MEGA X W
MEGA
BLAST
ImageJ

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