Eye fluke infection and lens size reduction in fish: a quantitative analysis

Diseases of Aquatic Organisms
Anssi Karvonen, Otto Seppälä

Abstract

Parasites have a variety of harmful effects on their hosts, some of which may be overlapping or complementary and thus easily overlooked but which are still important for the overall severity of infection. We investigated the effect of Diplostomum sp. eye fluke infection on the size of the eye lens in a range of wild and farmed fish species and those exposed to controlled parasite infection. We found that asymmetry in intensity of infection between the right and left lens of an individual fish affected lens size such that the lens with the higher intensity of infection was smaller. Interestingly, however, this was observed only in 3 of the 10 species studied (whitefish, smelt and sea trout) although in these 3 species the effect had already became evident at low intensities of infection. Furthermore, the average lens size was significantly smaller in experimentally exposed whitefish Coregonus lavaretus with a higher intensity of infection than the controls, emphasising the sensitivity of this species to parasite-induced changes in lens size. Reduction in lens size may contribute to the deleterious effects of cataract formation by intensifying the effects of individual parasites in the lens. It may also directly affect the overa...Continue Reading

Citations

Sep 16, 2011·Fish Physiology and Biochemistry·Chris NobleStephanie Yue Cottee
Sep 7, 2018·Indian Journal of Critical Care Medicine : Peer-reviewed, Official Publication of Indian Society of Critical Care Medicine·Pralay Shankar GhoshRavi Mishra
Dec 16, 2016·Folia Parasitologica·Matthew T Wayland, James C Chubb
Jul 22, 2021·Journal of Fish Diseases·Yajiao DuanKurt Buchmann
Sep 22, 2021·The Journal of Parasitology·Jenna M HulkeCharles D Criscione

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