Biological control using bacteriophages is a promising approach for mitigating the devastating effects of coral diseases. Several phages that infect , a widespread coral pathogen, have been isolated, suggesting that this bacterium is permissive to viral infection and is, therefore, a suitable candidate for treatment by phage therapy. In this study, we combined functional and genomic approaches to evaluate the therapeutic potential of BONAISHI, a novel phage, which was isolated from the coral reef in Van Phong Bay (Vietnam). BONAISHI appears to be strictly lytic for several pathogenic strains of and remains infectious over a broad range of environmental conditions. This candidate has an unusually large dsDNA genome (303 kb), with no genes that encode known toxins or implicated in lysogeny control. We identified several proteins involved in host lysis, which may offer an interesting alternative to the use of whole bacteriophages for controlling . A preliminary therapy test showed that adding BONAISHI to an infected culture of sp. cells reduced the impact of on sp. photosynthetic activity. This study showed that BONAISHI is able to mitigate infections, making it a good candidate for phage therapy for coral disease.