Abstract
Triploid induction is a promising tool for sterility and triploid turbot showed improvement in growth after sexual maturation. However, it is essential to characterise the response of triploids to pathogens to evaluate their suitability to aquaculture. The aim of the study was to investigate the ploidy status of turbot on the innate immune response and susceptibility against Vibrio anguillarum, Aeromonas salmonicida, and viral haemorrhagic septicaemia virus (VHSV) infection. Diploid and triploid turbot were subjected to experimental infection with these pathogens via intraperitoneal (IP) injection and immersion. Antibody response against V. anguillarum and A. salmonicida was assessed at 0, 7, 14, 21, and 30 days post injection. A. salmonicida did not cause any mortality in ploidy groups. However, ploidy had significant effects on susceptibility against V. anguillarum and VHSV infections. Triploids were significantly more susceptible to both V. anguillarum and VHSV. While there were no significant difference in antibody response against V. anguillarum in ploidy groups, antibody response of diploid turbot against VHSV was significantly higher.
Highlights
Effect of ploidy status of juvenile turbot, Scophthalmus maximus, on innate immune response and disease susceptibility...turbot industry worldwide (Pereiro, Figueras, and Novoa 2016; Lei et al 2006; Nougayrede, Sochon, and Vuillaume 1990; Westerdahl et al 1994; Brudeseth et al 2005; Feng et al 2020).Aeromonas salmonicida, causative agent of furunculosis (Öztürk and Altinok 2014), is a pathogenic bacteria that poses a threat in turbot culture (Coscelli et al 2014)
Causative agent of furunculosis (Öztürk and Altinok 2014), is a pathogenic bacteria that poses a threat in turbot culture (Coscelli et al 2014)
Fish used in the present study were offspring of turbot, Scophthalmus maximus, that originated from the Black Sea
Summary
Causative agent of furunculosis (Öztürk and Altinok 2014), is a pathogenic bacteria that poses a threat in turbot culture (Coscelli et al 2014). A. salmonicida mainly affects both farmed and wild salmonids (Austin and Austin 2016) but it has been isolated from other commercially important fish species including turbot (Lago, Nieto, and Farto 2012; Pedersen and Larsen 1996; Perez et al 1996; Nougayrede, Sochon, and Vuillaume 1990). Experimental challenges of turbot with A. salmonicida have been performed previously to determine pathogenicity of the bacteria V. anguillarum has been numerously reported as responsible for severe infections in turbot culture (Myhr et al 1991; Larsen, Pedersen, and Dalsgaard 1994; Planas et al 2005). Experimental challenges of turbot with V. anguillarum have been performed previously to determine pathogenicity of the bacteria
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