Acute hyperoxia induces systemic responses with no major changes in peripheral tissues in the Senegalese sole (Solea senegalensis Kaup, 1858)

Marina Machado*, Diogo Malheiro, Ana Couto, Jonathan M. Wilson, Matthew Guerreiro, Rita Azeredo, Jon Christian Svendsen, António Afonso, Renata Serradeiro, Benjamín Costas

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Senegalese sole Solea senegalensis is currently farmed in recirculation aquaculture systems that often involve water reoxygenation, which in turn may cause acute or prolonged hyperoxia exposures. In order to understand the impact of acute hyperoxia on the fish immune system and peripheral tisues such as gills and gut, Senegalese sole juveniles (30g) were exposed to normoxia (100% O2sat) as control and two hyperoxic conditions (150 and 200% O2sat) and sampled at 4 and 24 h. Fish haematological profile, total and differential blood
cell counts and plasma immune parameters were analysed. Histomorphology
and immunofluorescence analyses of gills and intestine were performed,
respectively, whereas head-kidney samples were used for assessing the
expression of immune-related genes. Results indicate that acute hyperoxia
exposure may reduce fish erythrocyte and haemoglobin levels. Moreover,
decreases in total leucocytes numbers, circulating lymphocytes, monocytes, alternative complement pathway activity and expression of cyclooxygenase-2 were observed in fish exposed to hyperoxia. In contrast, hyperoxia did not induce major effects on gill histomorphology nor in the protein content of ion and glucose cotransporters as well as a macrophage marker (V-ATPase) in the intestine. Although the activation of humoral mechanisms and immune-related genes were not dramatically affected by acute hyperoxia, the compromised immune cell status and the reduction of some inflammatory indicators are issues to consider under acute hyperoxia conditions
Original languageEnglish
JournalFish and Shellfish Immunology
Volume74
Pages (from-to)260-267
ISSN1050-4648
DOIs
Publication statusPublished - 2018

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