Immersion vaccines against Yersinia ruckeri infection in rainbow trout: Comparative effects of strain differences

In this study, effects of Yersinia ruckeri antigens on the immune mechanisms of rainbow trout (Oncorhynchus mykiss) were examined. The weight of the 120 fish used in this study was 20–30 g. After injecting 1 mg of formalin-inactivated whole cells (FKC) and O-antigen (Ag-O) intraperitoneally, blood was taken from the caudal vein of anaesthetized fish and metabolic activity of leukocytes (Nitroblue tetrazolium (NBT) activities), phagocytic activity (PA), phagocytic index (PI), serum protein and serum total immunoglobulin (TIg) levels were determined on day 30 after the first immunization. The same procedure was conducted in the control group. In all the experimental groups, considerable increases in the immune indicators were found and significant differences detected between the control and experimental groups (p < 0.05). Metabolic activity of leukocytes decreased significantly (p < 0.05) during the following treatment with antigens compared to the control fish group.

Download Full-text

Fatty Acid Composition in Yersinia ruckeri Strains Isolated from Rainbow Trout Farms

Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi ◽

10.18016/ksutarimdoga.vi.838056 ◽

2021 ◽

Author(s):

Ünal İSPİR ◽

Mikail ÖZCAN ◽

Muammer KIRICI

Keyword(s):

Fatty Acid Composition ◽

Fatty Acid ◽

Rainbow Trout ◽

Acid Composition ◽

Yersinia Ruckeri ◽

Trout Farms

Download Full-text

Dietary olive leaf (Olea europea L.) extract alters some immune gene expression levels and disease resistance to Yersinia ruckeri infection in rainbow trout Oncorhynchus mykiss

Fish & Shellfish Immunology ◽

10.1016/j.fsi.2018.04.063 ◽

2018 ◽

Vol 79 ◽

pp. 28-33 ◽

Cited By ~ 25

Author(s):

Esin Baba ◽

Ümit Acar ◽

Sevdan Yılmaz ◽

Fahriye Zemheri ◽

Sebahattin Ergün

Keyword(s):

Gene Expression ◽

Disease Resistance ◽

Rainbow Trout ◽

Immune Gene ◽

Yersinia Ruckeri ◽

Olive Leaf ◽

Immune Gene Expression ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Olea Europea ◽

Gene Expression Levels

Download Full-text

Propagated Fish in Resource Management

Propagated Fish in Resource Management ◽

10.47886/9781888569698.ch46 ◽

2004 ◽

Keyword(s):

Rainbow Trout ◽

Infectious Hematopoietic Necrosis Virus ◽

Fish Populations ◽

Whirling Disease ◽

Yersinia Ruckeri ◽

Myxobolus Cerebralis ◽

Infectious Hematopoietic Necrosis ◽

Tetracapsuloides Bryosalmonae ◽

Parasite Challenge

Abstract.—Laboratory challenges of two rainbow trout Oncorhynchus mykiss strains with Myxobolus cerebralis triactinomyxons confirm the resistance to whirling disease of the Hofer trout strain. Although the number of fish that became infected and developed clinical disease was similar for the Hofer and the Trout Lodge strains at all challenge doses, the median spore numbers were lower at all challenge doses for the Hofer rainbow trout. Parasite challenge doses required to produce lesions of high severity were 10-fold lower for the Trout Lodge strain (100 triactinomyxons) than the Hofer strain (1,000 triactinomyxons). Challenges of the Hofer strain with other common salmonid pathogens; the myxozoans Ceratomyxa shasta and Tetracapsuloides bryosalmonae, the bacterium Yersinia ruckeri, and the viruses Salmonid herpes-like virus type 1 and infectious hematopoietic necrosis virus demonstrate that the susceptibility of the Hofer strain was similar to what would be expected for other strains of rainbow trout, either domestic or wild. These pathogen challenges provide evidence that the Hofer trout present a low risk for introducing any pathogen that might be detrimental to native or established fish populations or further amplifying those that are endemic.

Download Full-text