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Fig. 5 | Parasites & Vectors

Fig. 5

From: Infection dynamics and tissue tropism of Parvicapsula pseudobranchicola (Myxozoa: Myxosporea) in farmed Atlantic salmon (Salmo salar)

Fig. 5

Parvicapsula pseudobranchicola infection in the gills (a) and pseudobranchs (b-h) of Atlantic salmon. a Gill primary filament day 89 PST with parasite stages (red) in blood vessel. b-f pseudobranch day 147 PST. b Overview (ISH) showing a compartmentalized occurrence of parasite stages; some areas between primary lamellae harbouring high parasite densities. c same in adjacent section (HE). d Detail of b, showing ISH stained parasites between the secondary lamellar lacunae. e Same pseudobranch as in d, arrows indicate nearly mature spores, and arrowheads intact pseudobranch cells. f Spores from wet preparation, at day 147 mature and immature spores occurred alongside earlier developmental stages. g-h Day 216 PST. g Pseudobranch with secondary lamellae, showing an irregular structure and high cellularity, but no parasite stages (ISH). h Same fish, other area (HE), showing tissue destruction

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