During the 2750 wild and cultured young salmonids fish (Oncorhynchus nerka, O. tschawytscha, O. keta, O. kisutch) and trout (Salvelinus
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1 uring the 2750 wild and cultured young salmonids fish (Oncorhynchus nerka, O. tschawytscha, O. keta, O. kisutch) and trout (Salvelinus malma) from Kamchatka were examined by histological and histochemical methods 1
2 uring the work we described external clinical signs, pathoanatomical changes and diagnostics of diseases, using standard histological and histochemical methods. Map of Kamchatka Places of fishes sampling Places of detection Myxobolus cerebralis Previously detection M. cerebralis (Bogdanova, 1970) 2
3 Lake Nachikinskoe M. cerebralis was revealed only in wild fingerlings of sockeye salmon with pathological signs from Lake Nachikinskoe (western sea coast of Kamchatka) in ugust 2006 Fingerlings of sockeye salmon O. nerka The pathogenic influence of the Myxobolus cerebralis ( ), determined from cartilaginous tissue (T) in the fingerlings sockeye salmon from Lake Nachikinskoe in А. Necrosis, lysis of the chondrocytes. B. Melanisation of the macrophages (MM).. Formation by epithelial granuloma (GR) around of the affected area of a necrotic tissue.. Spores ( ) and developing stages of the parasite ММ T T GR B 3
4 Spores of the M. cerebralis, determined from cartilaginous tissue of the fingerlings sockeye salmon from Lake Nachikinskoe in 2006 Spores fine, almost round, polar capsules of identical size, are separately placed among themselves, but converge to a forward pole, and during too time spores do not touch lateral walls. Sutural ridge is well advanced. iameter of spores 7-9 µm, thickness 4-5 µm, length of polar capsules µm their diameter µm (by seeva N.L.) В 4
5 Lake Nalychevskoe M. cerebralis was revealed in 60% of dead nine-spined stickleback from Lake Nalychevskoe (eastern coast of Kamchatka) in ugust 2009 Nine-spined stickleback Pungitius pungitius is typical hydrobiont of Kamchatka rivers and lakes Histopathological lesions revealed in the dead nine-spined stickleback P. pungitius from Lake Nalychevskoe in А, B. The complete replacement of the cartilaginous tissue of spinal column of nine-spined stickleback with spores of the parasite without granuloma formation ( ). B,. Spores and developing stages of the parasite B 5
6 Summary behaviours of the Lakes Nachikinskoe and Nalychevskoe (Nikolaev, Nikolaeva, 1991; Kurenkov, 2005, 2007; Bugaev, Kirichenko, 2008 ) Behaviours Lake Lake Nalychevskoe Nachikinskoe erivation (origin) glacial glacial-fiord Height above sea level 346 m 1.3 m rea 7.4 km² 13.2 km² The maximal depth 36.5 m 4 m verage temperature of the water in summer 16 º 18 º GR MM T GR B Pathological lesions in the cartilaginous tissue (T) of vertebrae ribs in the fingerlings of S. malma (, B) from Lake Kurilskoe in 2008 and O. nerka in Lake Nachikinskoe in 2005 (, ) as a result of the infestatiom by myxosporidia. А,. Melanisation of the macrophages (MM), formation by epithelial granuloma (GR) around of the affected area of a necrotic tissue (х100, H-E). B,. Prespore myxosporidian aggregates in the cartilaginous tissue (х400, H-E) 6
7 onclusion M. cerebralis were determined from salmonid and nonsalmonid fishes. This pathogenic agent was revealed in fishes from basins of the rivers of western and eastern coast of Kamchatka. The visual signs of a pathology in salmon were black discoloration of skin, lethargic swimming behavior, the delayed response on external stimulus. The following pathological lesions were determined in the surveyed fishes: in salmonids spores and developing stages of the parasite caused local necrosis of vertebrae ribs and lysis of the chondrocytes. The formation by epithelial granuloma around of the affected area of a tissue was marked. In nine-spined stickleback the cartilaginous tissue of a spinal column has been completely replaced with mature spores of the parasite without granuloma formation and destroyed head cartilage. May be nine-spined stickleback is natural carrier or source of M. cerebralis for salmonids fish in reservoir of Kamchatka. It is necessary to make a point of detection of M. cerebralis in Lake Nachikinskoe as basin of the river Bolshaya where two fish-hatcheries are located that reared fingerlings of sockeye, chum and chinook salmons. 7
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