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The determination by physical means of infestation in fish McMurtrie, Gilbert Eric

Abstract

The following report is a summary of an investigation undertaken on behalf of the Canadian fishing industry, more especially the inland fisheries of the Prairie provinces, by the Fisheries Research Board of Canada. The investigation was allotted to the Pacific Fisheries Experimental Station at Vancouver, the actual work being performed in the Physics Department of the University of British Columbia. The application of physical methods to biological and other problems is becoming more prevalent. The case in hand is an example of the application of physics, more particularly the laws of light scattering, to determining the infestation of fish by Triaenophorus crassus. The arguments wherever possible have been stated in everyday language and notwithstanding the possibility of boring the informed reader, all experiments are described in detail. This, it is hoped, will accomplish two purposes. Firstly the biologist will have a better understanding of the investigation and secondly the application of physics to similar problems can be assessed. Included at the end of the section on candling is an attempt to explain the formation of shadows by objects imbedded in turbid media. The argument is first given, in simple language followed by a mathematical discussion. The complexity of the theory of scattered light in terms of ultimate processes need not be stressed. A treatment based on the theory of M. Born is found in Appendix I.

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