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In 1953 the writer reported a note on a new Sporozoa, Hexacapsula neothunni gen. et sp. nov., from the jellied muscle of the yellowfin tuna, Neothunnus macropterus, caught at the Bunda Sea. In the report the writer stated that the jellied condition of the fish muscle is observed in some other fish such as the halibut, turbot, swordfish and tunafish, etc. But, so far as we know, literature which deals in detail with this phenomena or analogous conditions of the fish muscle is scanty, except for the report by M'GONIGLE and LEIM on jellied swordfish and papers on wormy and mushy halibut by DAVIS and THOMPSON. Furthermore, the detailed studies on the "boil disease" of European fresh-water fish by PFEIFFER, KEYSSELITZ and THELOHAN, etc., seem to be closely connected with the investigation of this phenomenon. In the summer of 1953, the writer had an opportunity to examine samples of jellied swordfish at Kesennuma, one of the most famous fishing ports on the Northeast (Pacific) coast of Japan, and discovered numerous spores of Myxosporidian parasite in the jellied muscle. Later on he discovered the Myxosporidian spore of a quite different shape in a similarly jellied condition in the common Japanese sea-bass, Lateolabrax japonicus, caught in Ibaragi Prefecture. These two Myxosporidia seem not only to be new to science, but as in the case of the other species already' reported also present an interesting and important problem for the investigation of the jellied condition of fish muscle. The present paper is a preliminary presentation of some biological observations

nihon suisan gakkaishi/nippon suisan gakkaishi

On the Two New Myxosporidia, Chloromyxum musculoliquefaciens sp. nov. and Neochloromyxum cruciformum gen. et sp. nov., From the Jellied Muscle of Swordfish, Xiphias gladius Linne, and Common Japanese Sea-Bass, Lateolabrax japonicus (TEMMINK et SCHLEGEL)