Anssi Karvonen

TL;DR: The effect of increasing water temperature on aquatic disease dynamics is demonstrated, but the importance of the biology of each disease, as well as the role of local conditions, in determining the direction and magnitude of these effects are emphasised.

TL;DR: Investigating the influence of parasites on the susceptibility of fish to artificial aerial predators and the ability of D. spathaceum eye flukes to alter fish behaviour suggested that infected fish should be easier prey for gulls and terns.

TL;DR: It is found that the catchability of fish increased with the coverage of parasite-induced cataract and the ability of the parasite to manipulate fish behaviour by impairing its vision may have resulted from selection preferring parasite genotypes with higher transmission efficiency.

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.