Infection process, viability and establishment of Anisakis simplex s.l. L3 in farmed fish, A histopathological study in gilthead seabream

0562608 - BC 2023 RIV NL eng J - Journal Article
Lopez-Verdejo, A. - Born-Torrijos, Ana - Montero-Cortijo, E. - Raga, J. A. - Valmaseda-Angulo, M. - Montero, F. E.
Infection process, viability and establishment of Anisakis simplex s.l. L3 in farmed fish, A histopathological study in gilthead seabream.
Veterinary Parasitology. Roč. 311, NOV (2022), č. článku 109805. ISSN 0304-4017. E-ISSN 1873-2550
R&D Projects: GA ČR(CZ) GJ20-14903Y
Institutional support: RVO:60077344
Keywords : Aquaculture * Mediterranean sea * Anisakiasis * Risk assessment * Experimental infection * Unsuccessful infection
OECD category: Behavioral sciences biology
Impact factor: 2.6, year: 2022
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0304401722001595?via%3Dihub

Anisakis spp. (Nematoda, Anisakidae) are parasites known by their economic and health impacts, as their L3 larval stages infect a variety of fish species, many of them commercial species, sometimes causing zoonotic episodes due to consumption of raw or undercooked fish. The aim of this study is to determine the infection process and the potential impact of A. simplex s.l. L3 on gilthead seabream (Sparus aurata L.), one of the most important fish species in Mediterranean aquaculture, by periodic histological monitoring of the infection process. For this, fish were experimentally infected with A. simplex s.l. L3 and periodically analysed for L3 larvae, collecting samples at different time points (hours post ingestion, hpi): 3, 6, 12, 18, 24, 36, 48, 72, 96, 120, 144, 168 and 192, up to 6 months post infection (mpi). All samples were observed under a stereomicroscope and later fixed for histological examination. A. simplex s.l. L3 were only found on the visceral surface and mesenteric tissue, but never free or encapsulated in muscle. Chronological events were found to occur faster than those reported in previous studies. They were first observed 6 hpi in the coelomic cavity, being present up to 48 hpi. While the earliest evidence of fibrocytes surrounding A. simplex s.l. L3 larvae were observed at 18 hpi, complete spiral encapsulation occurred by 72 hpi. Alive parasites were observed up to 6 mpi. Although the infection of gilthead seabream by Anisakis spp. larvae is feasible, it seems unlikely, especially in aquaculture given the hygienically controlled feeding systems. In the event of infection, the transmission would be unlikely due to the poor condition in which specimens of Anisakis spp. are found. Furthermore, since no larvae were detected in the fish's muscle, human infection seems improbable.
Permanent Link: https://hdl.handle.net/11104/0339440