Parasites in Imported Edible Fish and a Systematic Review of the Pathophysiology of Infection and the Potential Threat to Australian Native Aquatic Species

• Published in: Diversity (Basel) Vol. 15; no. 4; p. 470
• Main Authors: Williams, Michelle, Hernandez-Jover, Marta, Shamsi, Shokoofeh
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.03.2023
• Subjects: Australian biosecurity; Biosecurity; Commercial species; Fecundity; Fish; Fish as food; Fish parasites; imported fish; Indigenous species; Infections; Interlibrary loans; International trade; Isoparorchis; Literature reviews; Marketability; Mesentery; Morphology; native aquatic species; Pallisentis; Parasites; Parasitism; Pathophysiology; Physiological aspects; Seafood; Search engines; Snakeheads (Fishes); Supply chains; Systematic review; Zoonoses; Australia; Japan; India
• ISSN: 1424-2818; 1424-2818
• DOI: 10.3390/d15040470

Previous research has shown that certain types of edible fish imported into Australia are infected with Euclinostomum/Isoparorchis digenetic trematodes. In the present study, imported Channa fish were examined for parasites which were then morphologically identified to the lowest taxonomic unit possible. Here we provide the first Australian report of Pallisentis sp. Van Cleave, 1928 (Prevalence (P) 35.9%) of family Quadrigyridae; Genarchopsis sp. Ozaki, 1925 (P. 16.5%), family Derogenidae and Senga sp. Dollfus, 1934 (P. 4.8%) in edible imported Channa fish (n = 103). Pallisentis sp. and Senga sp. have invasive hold fast organs which cause significant mechanical damage to fish intestinal structures and Euclinostomum/Isoparorchis cause severe pathology and loss of marketability in infected fish. These exotic parasites, if introduced into Australia, have the potential to negatively impact the health, fecundity, resilience and marketability of native and commercial fish species. Biosecurity is a constant ontogenesis of novel hypothesis based on current scientific discoveries. To further increase understanding of how parasitism impacts fish health, a systematic literature review was conducted and the pathophysiology of infection described. Potential exposure pathways and parasite host associations in Australia are discussed.