|Document Type:||Journal Article|
|Title:||Pathogenicity of members of the Vibrionaceae family to cultured juvenile sablefish|
|Author:||M. R. Arkoosh, J. P. Dietrich|
|Journal:||Journal of Aquatic Animal Health|
|Keywords:||sablefish,aquaculture,Listonella anguillarum,Vibrio ordalii,Vibrio salmonicida,black cod|
Sablefish are a prized seafood species due to their high oil content and white flaky flesh. Raising these species in culture can help to provide an important source of protein for humans and relief to declining wild fish populations. Understanding the environmental factors that influence the production of sablefish is important for successful culturing. The significance of host-pathogen interactions in sablefish culture and environmental implications are unknown. Pathogens could potentially cause losses of cultured sablefish stocks due to disease, while sablefish cultured in net pens may also serve as reservoirs for pathogens and potentially transmit disease to wild fish species. In this initial study, the susceptibility of juvenile sablefish to three bacterial pathogens from the family Vibrionaceae was examined. Listonella anguillarum, Vibrio ordalii, and V. splendidus can pose serious economic threats to cultured fish and shellfish. Groups of juvenile sablefish were exposed to five concentrations of each of the pathogens. Sablefish were susceptible to L. anguillarum, but were resistant to V. ordalii and V. splendidus at exposure concentrations ≤ 1.32x107 colony forming units (CFU)/ml and ≤ 3.57x106 CFU/ml, respectively. The greatest L. anguillarum concentration examined (8.7 x106 cfu/ml) resulted in 24% mortality in juvenile sablefish.A 24% loss of sablefish brood-stock could significantly influence an aquaculture program. As determined by multiple logistic regression, sablefish survival to L. anguillarum exposure was significantly affected by their mass, with larger fish having a greater probability of survival. Aquaculture operations could employ various strategies to minimize the loss of juvenile sablefish by accounting for known pathogen susceptibilities and fish size.