摘要:

Four nematodes, two acanthocephalids and specimens of the cestode genusDiphyllobothriumare reported from seals and white whales in Arctic and temperate coastal waters of Canada.Phocascaris netsikisp. nov. is described fromPhoca hispidaand observations on flagella inAnisakis simplexare recorded.

ISSN:1923-4287    

DOI:10.1139/cjr40d-036

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

The distributions of the red and yellow colours of the cooked muscle tissue of British Columbia spring salmon (Oncorhynchus Tschawytscha) around the means of the individual distributions occurring in small, arbitrarily chosen time intervals are composite distributions each consisting of two component normal distributions, thus indicating that there are two, and only two, varieties of this species when the salmon are classified on the basis of these two quality characteristics. The proportions of the pale and red varieties are very nearly 1:3 so that when sampling fluctuations are taken into account the data are in complete agreement with the hypothesis that the true proportions are, respectively,and.

ISSN:1923-4287    

DOI:10.1139/cjr40d-037

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

Three new species of internal trematodes,Plagioporus serratussp. nov.,Phyllodistomum lysterisp. nov., andParastiotrema ottawanensisgen. et sp. nov., are described from Canadian freshwater fish.Plagioporus serotinusStafford, 1904, is redescribed, and the genusCaudotestisYamaguti, 1934, is reduced to synonymity withPlagioporusStafford, 1904.Anallocreadium pearseiHunter and Bangham, 1932, is considered synonymous withA.armatumMcCallum, 1895. The genusBunoderinaMiller, 1936, is reduced to synonymity withBunoderaRailliet, 1896.

ISSN:1923-4287    

DOI:10.1139/cjr40d-038

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

A photoelectric colour comparator, previously described (Can. J. Research, D, 17: 1-7. 1939) has been improved to permit greater precision and more rapid operation. Measurements on meat indicate that the degree of precision attainable with the new comparator is determined primarily by sampling, rather than instrumental, errors.

ISSN:1923-4287    

DOI:10.1139/cjr40d-039

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

The incidence of infection ofOestrus ovislarvae in lambs has been determined. Flies were obtained from larvae which pupated in the laboratory. The three larval stages of the fly were studied and characteristic features illustrated. Information relative to the rate of growth of the larvae was obtained from a routine examination of infected animals and experimental infection of lambs. The effect of the parasites on these experimentally infected animals was noted.

ISSN:1923-4287    

DOI:10.1139/cjr40d-040

出版商:NRC Research Press    

年代:1940

数据来源: NRC