study on distribution of infectious hematopoietic necrosis (ihn) in five major provinces producingrainbowtrout (oncorhynchus mykiss) fryin iran byindirect fluorescence antibody (ifat) and nested-rtpcr techniques

Comparative pathogenesis of three strains of infectious hematopoietic necrosis virus in rainbow trout Oncorhynchus mykiss

Three strains of infectious hematopoietic necrosis virus (IHNV) were compared for their pathogenicity to alevin rainbow trout Oncorhynchus n~ykiss by waterborne exposure of the trout to approximately equal concentrations of each virus strain The Idaho strain of IHNV (Type 2) was the most virulent and induced a 62 % mortality over a 10 d period at water temperatures of 10°C. In contrast, strains...

Genetic variation underlying resistance to infectious hematopoietic necrosis virus in a steelhead trout (Oncorhynchus mykiss) population.

Understanding the mechanisms of host resistance to pathogens will allow insights into the response of wild populations to the emergence of new pathogens. Infectious hematopoietic necrosis virus (IHNV) is endemic to the Pacific Northwest and infectious to Pacific salmon and trout (Oncorhynchus spp.). Emergence of the M genogroup of IHNV in steelhead trout O. mykiss in the coastal streams of Wash...

Recombinant infectious hematopoietic necrosis viruses induce protection for rainbow trout Oncorhynchus mykiss.

Infectious hematopoietic necrosis virus (IHNV) and viral hemorrhagic septicaemia virus (VHSV) are rhabdoviruses that infect salmonids, producing serious economic losses. Two recombinant IHN viruses were generated by reverse genetics. For one (rIHNV GFP) the IHNV NV gene was replaced with the green fluorescent protein (GFP) gene. In the other (rIHNV-Gvhsv GFP) the G gene was also exchanged for t...

Genetic markers associated with resistance to infectious hematopoietic necrosis in rainbow and steelhead trout (Oncorhynchus mykiss) backcrosses

Backcrosses of rainbow trout and steelhead (Oncorhynchus mykiss) were used to construct a linkage map and to identify associations between molecular markers and quantitative trait loci (QTL) determining resistance to infectious hematopoietic necrosis virus (IHNV). The sire map covers 1019 centimorgans (cM), and it is composed of 257 molecular markers [185 amplified fragment length polymorphisms...

Nasal vaccination of young rainbow trout (Oncorhynchus mykiss) against infectious hematopoietic necrosis and enteric red mouth disease.

Determining the earliest age at which farmed fish can be successfully vaccinated is a very important question for fish farmers. Nasal vaccines are novel mucosal vaccines that prevent aquatic infectious diseases of finfish. The present study investigates the ontogeny of the olfactory organ of rainbow trout by histology and aims to establish the earliest age for vaccination against infectious hem...

Isolation and Identification of the Infectious Haematopoietic Necrosis Virus (IHNV)-like Agent from Farmed Rainbow Trout (Oncorhynchus mykiss) from Iran