This report documents 2 cases of branchioblastomas in koi carp (Cyprinus carpio). Macroscopically, both cases were characterized by well-demarcated, pale red nodular masses located at the left first branchial arch and the right pseudobranch, respectively. Histologically, the neoplasias were composed of blast-like cells that differentiated into cartilage and branchial lamellae embedded in abunda...

It is well known that fish caudal fins can be completely regenerated after fin amputation. Although much research on fin regeneration has been carried out, there have been very few reports regarding fin regeneration after tail amputation. In this study, we used grass carp, common carp, koi carp, and zebrafish as experimental organisms. Some caudal fins could be distinctly regenerated in 2 weeks...

Cyprinid herpesvirus 3 (CyHV-3) infects koi and common carp and causes widespread mortalities. While the virus is a significant concern for aquaculture operations in many countries, in Australia the virus may be a useful biocontrol agent for pest carp. However, carp immune responses to CyHV-3, and the molecular mechanisms underpinning resistance, are not well understood. Here we used RNA-Seq on...

BACKGROUND Hikui disease is a well known disfiguring disease of koi carp (Cyprinus carpio) primarily affecting fish with red pigmentation. It causes light orange to golden yellow, multifocal to coalescing raised patches, starting from the red cutaneous areas. Some cases respond to surgery or topical treatment, but recurrence is common. OBJECTIVES To describe the clinical and pathological pres...

The present study aimed to evaluate the effectiveness of three complex dietary candidate probiotics (LDJ, LAC, and LJD) composing different probiotic combinations on growth performance, digestive enzyme activities, antioxidant parameters, intestinal microbiota in koi carp (Cyprinus carpio var. koi). After a 60-days feeding trial, samples from control groups were obtained analyzed. results sugge...

An mRNA-specific reverse transcription (RT)-PCR primer set spanning the exon junction of a spliced putative terminase gene in the koi herpesvirus (KHV) was developed to detect the replicating stage of the virus. The proposed RT-PCR amplified a target gene from the RNA template, but not from a DNA template extracted from common carp brain (CCB) cells infected with KHV. In addition, the RT-PCR di...

Cyprinid herpesvirus 3 (CyHV-3), previously designated carp interstitial nephritis and gill necrosis virus or koi herpesvirus, is the cause of a worldwide mortal disease of koi and carp. Morphologically, the virus resembles herpesviruses, yet it bears a genome of 277 to 295 kbp, which is divergent from most of the genomic sequences available in GenBank. The disease afflicts fish in the transien...

Epizootics of Koi herpesvirus (KHV) cause mass mortalities in koi carp and common carp worldwide. We used a newly developed 'per-gill infection' procedure with live KHV, and then conducted detailed histopathological and ultrastructural studies of KHV-infected cells including an examination of the morphology and morphogenesis of KHV. The primary target of KHV was respiratory epithelial cells of ...