Abstract
Dissotichus eleginoides has a discontinuous circumpolar geographic distribution restricted to mountains and platforms, mainly in Subantarctic and Antarctic waters of the southern hemisphere, including the Southeast Pacific, Atlantic and Indian oceans and in areas surrounding the peninsular platforms of subantarctic islands. The aim of this work was to determine and characterize the gastrointestinal parasitic and microbial fauna of specimens of D. eleginoides captured in waters of the south-central zone of Chile. The magnitude of parasitism in D. eleginoides captured in waters of the south-central zone of Chile is variable, and the parasite richness is different from that reported in specimens from subantarctic environments. Next-generation sequencing (NGS) of the microbial community associated to intestine showed a high diversity, where Proteobacteria, Firmicutes, and Bacteriodetes were the dominant phyla. However, both parasitic and microbial structures can vary between fish from different geographic regions
Highlights
The Family Nototheniidae comprises numerous species of fish that mainly inhabit Antarctic and subantarctic waters [1]
D. eleginoides has a discontinuous circumpolar geographic distribution restricted to mountains and platforms, mainly in subantarctic and Antarctic waters of the southern hemisphere, including the Southeast Pacific, Atlantic and Indian oceans and in areas surrounding the peninsular platforms of subantarctic islands
The knowledge of the life cycles of the parasites identified in this study is not sufficiently clarified, the results reported here confirm the participation of D. eleginoides as a definitive, intermediate, or paratenic host
Summary
The Family Nototheniidae comprises numerous species of fish that mainly inhabit Antarctic and subantarctic waters [1]. Dissostichus eleginoides Smitt, 1898, known as Chilean Sea Bass, stands out because it is considered one of the main target species of commercial fishing in the Southern Ocean. D. eleginoides has a discontinuous circumpolar geographic distribution restricted to mountains and platforms, mainly in subantarctic and Antarctic waters of the southern hemisphere, including the Southeast Pacific, Atlantic and Indian oceans and in areas surrounding the peninsular platforms of subantarctic islands. Through the Pacific and Uruguay (35◦ LS) through the Atlantic, bordering the entire area of Patagonia at depths ranging between 80 and 2500 m [2].
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