E. T. Valtonen

TL;DR: An increase in the occurrence of the bacterial fish disease Flavobacterium columnare in salmon fingerlings at a fish farm in northern Finland over 23 years is shown, hypothesizing that this emergence was owing to evolutionary changes in bacterial virulence.

TL;DR: In this paper, the authors presented experimental support for the hypothesis that ectoparasite infection increases susceptibility of fish to a bacterial pathogen, and they showed that infection with A. coregoni and F. columnare alone led to significantly lower survival.

TL;DR: It is found that when fish with a low level of infection were held in restricted cages in natural conditions they became infected and developed cataracts as a result of this infection, suggesting that acquired resistance is insufficient in protecting fish against the parasite or the deleterious effects of infection in conditions where fish could not avoid the parasite.

TL;DR: The slit-lamp methodology proved useful in scoring the cataracts since it provides a 3-dimensional view into the lens and gives an actual picture of the location and intensity of theCataracts, which allows detailed investigations of mechanisms underlying cataract formation in various fish species.

TL;DR: Reduction of fish density could be used in prevention of columnaris disease especially if water temperature is high and because the lower rearing density can also decrease the transmission of ectoparasites and penetrating endoparAsites, it could be an efficient tool in ecological disease management.