. Contributions to Canadian biology. Marine biology; Natural history. 36 MARINE AND FISHERIES 5 GEORGE v., A. 1915 which he also searched for the parasite. Fiebiger attributes his failure to find the parasite in the latter species to his not having examined a sufficient number of fish. Assuming that the parasite described by Auerbach ('09, p. 74, 81) is Goussia gadi, as seems probable, it has been found in Gadus aeglefinus on the coast of Norway at Bergen. The coccidian described by J. Miiller ('42) from Gadus callarias is identified by Fiebiger ('08) as Goussia gadi. The parasite found by the
. Contributions to Canadian biology. Marine biology; Natural history. 36 MARINE AND FISHERIES 5 GEORGE v., A. 1915 which he also searched for the parasite. Fiebiger attributes his failure to find the parasite in the latter species to his not having examined a sufficient number of fish. Assuming that the parasite described by Auerbach ('09, p. 74, 81) is Goussia gadi, as seems probable, it has been found in Gadus aeglefinus on the coast of Norway at Bergen. The coccidian described by J. Miiller ('42) from Gadus callarias is identified by Fiebiger ('08) as Goussia gadi. The parasite found by the writer is also identified as Goussia gadi. The distribution of Goussia gadi is therefore from the Cattegat to the North of Norway, Iceland and Eastern Canada. There can be no doubt that the parasites in question, Myxidium bergense and Goussia gadi complete their life cycle in the host fish, in other words there is no intermediate host. Hence their spread occurs only from fish to fish, and a fish becomes infected only by coming into such relations to an infected fish that the spores of the parasite are carried to it from the latter by water currents. This probably means the fairly close proximity of the two fish. The investigation of infectious diseases, where the method of infection is contaminative, has shown that their spread over large areas is almost invariably due to the migration of diseased animals. It is possible that the spread of Myxidium bergense and Goussia gadi over the North Atlantic is due to the migrations of the host fishes in these waters. The places mentioned in the discussion of the distribution of Myxidium bergense and Goussia gadi are shown on the map (Fig. 6).. 1^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biological Board of Canada; Canada. Marine Biological Station. Toronto, B
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