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First Report of Vibrio Tubiashii Associated with a Massive Larval Mortality Event in a Commercial Hatchery of Scallop Argopecten Purpuratus in Chile

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First Report of Vibrio Tubiashii Associated with a Massive Larval Mortality Event in a Commercial Hatchery of Scallop Argopecten Purpuratus in Chile fmicb-07-01473 September 20, 2016 Time: 19:7 # 1 ORIGINAL RESEARCH published: 20 September 2016 doi: 10.3389/fmicb.2016.01473 First Report of Vibrio tubiashii Associated with a Massive Larval Mortality Event in a Commercial Hatchery of Scallop Argopecten purpuratus in Chile Rodrigo Rojas1,2,3*, Claudio D. Miranda2,3, Javier Santander4 and Jaime Romero1,3* 1 Laboratorio de Biotecnología, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile, 2 Laboratorio de Patobiología Acuática, Departamento de Acuicultura, Universidad Católica del Norte, Coquimbo, Chile, 3 Centro Aquapacífico, Coquimbo, Chile, 4 Laboratorio de Patogénesis Microbiana y Vacunación, Facultad de Ciencias, Universidad Mayor, Santiago, Chile The VPAP30 strain was isolated as the highly predominant bacteria from an episode of massive larval mortality occurring in a commercial culture of the Chilean scallop Argopecten purpuratus. The main aims of this study were, to characterize and identify the pathogenic strain using biochemical and molecular methods to demonstrate its Edited by: pathogenic activity on scallop larvae, to characterize its pathogenic properties and to Hongyue Dang, describe the chronology of this pathology. The pathogenic strain was identified as Vibrio Xiamen University, China tubiashii based on its phenotypic properties and the sequence analysis of its 16S rRNA Reviewed by: Melissa Garren, and housekeeping genes (ftsZ, gapA, gyrB, mreB, pyrH, recA, rpoA and topA). When California State University, USA triplicate cultures of healthy 10–day–old scallop larvae were challenged with 1 × 105 Marie-Agnès Travers, −1 French Research Institute colony forming units (CFU) mL of the VPAP30 strain, percentages of larval survival for Exploitation of the Sea, France of 78.87 ± 3.33%, 34.32 ± 4.94%, and 0% were observed at 12, 24, and 36 h, *Correspondence: respectively; whereas uninfected larval cultures showed survival rates of 97.4 ± 1.24% Rodrigo Rojas after of 48 h. Clinical symptoms exhibited by the scallop larvae infected with the VPAP30 [email protected] Jaime Romero strain include the accumulation of bacteria around the scallop larvae, velum disruption [email protected] and necrosis of digestive gland. The 50% lethal dose (LD50) of VPAP30 strain at 24 and 48 h was 1.3 × 104 and 1.2 × 103 CFU mL−1, respectively. The invasive pathogenic Specialty section: This article was submitted to activity of the VPAP30 strain was investigated with staining of the bacterial pathogen Aquatic Microbiology, with 5-DTAF and analyzing bacterial invasion using epifluorescence, and a complete a section of the journal Frontiers in Microbiology bacterial dissemination inside the larvae at 24 h post-infection was observed. When Received: 23 June 2016 scallop larvae were inoculated with cell-free extracellular products (ECPs) of VPAP30, Accepted: 05 September 2016 the larval survival rate was 59.5 ± 1.66%, significantly (P < 0.001) lower than the Published: 20 September 2016 control group (97.4 ± 1.20%) whereas larvae treated with heat-treated ECPs exhibited Citation: a survival rate of 61.6 ± 1.84% after 48 h of exposure. This is the first report of the Rojas R, Miranda CD, Santander J and Romero J (2016) First Report isolation of V. tubiashii from the diseased larvae of the scallop A. purpuratus, occurring of Vibrio tubiashii Associated with in a commercial culture in Chile, and it was demonstrated that the VPAP30 strain exhibits a Massive Larval Mortality Event in a Commercial Hatchery of Scallop high pathogenic activity on scallop larvae, mediated both by bacterial invasion and the Argopecten purpuratus in Chile. production of toxigenic heat-stable compounds. Front. Microbiol. 7:1473. doi: 10.3389/fmicb.2016.01473 Keywords: Vibrio tubiashii, Scallop larvae, Vibriosis, Shellfish pathology, Argopecten purpuratus Frontiers in Microbiology | www.frontiersin.org 1 September 2016 | Volume 7 | Article 1473 fmicb-07-01473 September 20, 2016 Time: 19:7 # 2 Rojas et al. Vibrio tubiashii Pathogenic to Scallop Larvae INTRODUCTION a high genomic similarity between both species (Ben-Haim et al., 2003; Ushijima et al., 2014). The culture of the Chilean scallop Argopecten purpuratus Despite that efficient rearing techniques for scallop larvae (Lamarck, 1819) is the second most important industry in production that have been developed, Chilean commercial Chilean mariculture and is primarily concentrated in the north hatcheries are currently suffering recurrent episodes of high region of the country (von Brand et al., 2006); however, mortalities of reared larvae, mainly associated with high levels recurrent episodes of larval mortalities mainly due to bacterial of vibrio (Miranda et al., 2014; Rojas et al., 2015a). The infections have been observed, causing high economical losses identification of bacterial strains causing epizootics in larval and consequently precluding the sustainability of this industry. cultures and understanding their pathogenic activity are essential These bacterial infections are commonly characterized by a for the development of adequate and efficient protocols of larval sudden cessation of larval motility leading to massive mortalities management, as well as for implementing proper bacteriologic of reared larvae. Previous studies demonstrated the pathogenic monitoring strategies to prevent and control bacterial outbreaks activity of bacterial strains identified as Halomonas sp. (Rojas occurring in commercial hatcheries of scallop larvae. et al., 2009), Vibrio anguillarum-related (Riquelme et al., 1995), Considering that knowledge of the identity and pathogenic Vibrio splendidus (Rojas et al., 2015a) and the association of mechanisms of bacterial pathogens causing massive mortalities Aeromonas hydrophila and Vibrio alginolyticus (Riquelme et al., of scallop larvae reared in commercial hatcheries in Chile 1996) on scallop larvae. remains scarce, the aims of this study were to characterize and Vibrio species have been described worldwide as the main identify a highly pathogenic Vibrio strain recovered from massive aetiological agents of bacterial pathologies affecting reared larvae larval mortality event that occurred in a commercial hatchery, of various shellfish species (Waechter et al., 2002; Anguiano- to characterize its pathogenic properties and to describe the Beltrán et al., 2004; Estes et al., 2004; Gay et al., 2004; Gómez- chronology of the pathology. León et al., 2005; Prado et al., 2005, 2014, 2015; Labreuche et al., 2006; Garnier et al., 2007; Rojas et al., 2015a; Dubert et al., 2016b). Clinical symptoms commonly exhibited by reared MATERIALS AND METHODS shellfish larvae affected by vibriosis include the reduction of larval motility, erratic swimming, closing of valves, velum detachment, Bacterial Isolation and bacterial swarming inside and around the larvae (Prado The pathogenic strain VPAP30 was recovered from a massive et al., 2005; Beaz-Hidalgo et al., 2010; Rojas et al., 2015a). Most mortality event of reared-larvae of the scallop A. purpuratus of these clinical signs were described in larval cultures of the occurring in a commercial hatchery located in Tongoy Bay in the clam species Ruditapes decussatus (Gómez-León et al., 2005) and north of Chile. Triplicate samples of settled dead and moribund Ruditapes philippinarum (Dubert et al., 2016a), oyster species larvae were aseptically collected from the bottom of the rearing Crassostrea virginica (Gómez-León et al., 2008) and Crassostrea tank during its water exchange using a sterile glass flask and were gigas (Estes et al., 2004; Gay et al., 2004; Garnier et al., 2007; transported to the laboratory for immediate processing. Larval Elston et al., 2008), and scallop species Pecten maximus (Nicolas samples were centrifuged at 960 g for 2 min using an Eppendorf et al., 1996; Torkildsen et al., 2005), Argopecten ventricosus Model 5415D centrifuge (Hamburg, Germany) and the water (Sainz et al., 1998; Luna-González et al., 2002) and Patinopecten excess was discarded. Settled larvae were ground by hand using yessoensis (Liu et al., 2013). The pathogenicity of Vibrio strains a sterile glass digester containing 2 mL of sterile physiological causing vibriosis outbreaks is mediated by bacterial invasion saline (0.85% NaCl; PS) to obtain a homogenate according to the (Rojas et al., 2015a; Dubert et al., 2016a) as well as the production method of Nicolas et al.(1996). The homogenate was inoculated of toxigenic extracellular products (ECPs) (Elston and Leibovitz, in triplicate onto Tryptic Soy Agar (Difco, NJ, USA) with 2% of 1980; Labreuche et al., 2006; Binesse et al., 2008; Hasegawa et al., NaCl (Oxoid, Hants, UK) (TSA2), and plates were incubated at ◦ 2008; Labreuche et al., 2010; Rojas et al., 2015a). 20 C for 48 h. The predominant colony grown almost as a pure Vibrio tubiashii was recognized 50 years ago as an important culture in plates seeded with triplicate larval samples was isolated ◦ pathogen of hard clam and oyster larvae (Tubiash et al., 1965, using TSA2 and the bacterial strain was preserved at −85 C in 1970), causing the pathology “bacillary necrosis”, characterized CryoBank (Mast Diagnostic, Merseyside, UK) vials prior use. by disruption and loss of cilia of the larval velar apparatus, high bacterial colonization of the larval shell and mantle, and Biochemical and Physiological abnormal swimming behavior. Later, Elston et al.(2008) reported Characterization a re-emergence of vibriosis episodes caused by V. tubiashii in The phenotypic characteristics suggested by Noguerola a
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