Skin Injuries Contribute to Nocardiosis in Japanese Amberjack <i>Seriola</i> <i>quinqueradiata</i>

Abstract

Nocardia seriolae, a Gram-positive, weakly acidfast, filamentous bacterium, is the causative agent of nocardiosis of cultured amberjacks Seriola spp. in Japan (Kudo et al., 1988). This infectious disease was first noticed in ca. 1967 (Kariya et al., 1968) and is still causing economic damages to the aquaculture industry. N. seriolae is sensitive to several antimicrobial agents in vitro (Itano and Kawakami, 2002), which, however, show a low killing effect in vivo on the bacterium in the nodules formed in the viscera of infected fish. Currently, several sulfonamides like sulfamonomethoxine are approved to be used as therapeutic agents of nocardiosis, but it is practically difficult to diagnose fish in an early stage of infection before the nodule formation (Itano et al., 2008). Development of vaccines against nocardiosis is

Biology and Pathogenicity of <i>Benedenia akajin</i> Infecting Hatchery-reared <i>Plectropomus leopardus </i>Juveniles

“…Dec. 23, 2020). Skin fluke infections frequently induce secondary bacterial infections (Miyoshi et al, 2019), and infection by B. akajin and the trauma from freshwater bath treatments may be responsible for the gliding bacterial diseases in P. leopardus.…”

Granulomatosis in fish aquaculture: a mini review

“…With the increase in the intensification of culture methods in aquaculture, fish become more susceptible of being weakened by stress or physical injury. Although nocardiosis is increasing in cultured fish, pathogenesis and spread mechanisms are still poorly understood; however, these organisms can be latent in the environment and proliferating only when fish present accessible injuries (Miyoshi et al 2019).…”

“…Although nocardiosis is increasing in cultured fish, pathogenesis and spread mechanisms are still poorly understood; however, these organisms can be latent in the environment and proliferating only when fish present accessible injuries (Miyoshi et al . 2019).…”

Consumption of monogenean eggs by crustaceans and fish

“…Skin flukes are ectoparasites belonging to the family Capsalidae, which feed on the epithelial tissues of fish. Their infection induces skin lesions, cloudy eyes and physiological impairment leading to reduced growth, secondary bacterial/viral infections and, ultimately, death (Miyoshi et al., 2019). Mazocraeid polyopisthocotyleans, commonly called ‘gill flukes’, are another major threat in mariculture.…”