published_or_final_version / Zoology / Master / Master of Philosophy

published_or_final_version / Zoology / Master / Master of Philosophy

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No description available.

Thesis (M.Phil.)--University of Hong Kong, 1998. / Includes bibliographical references. Also available in print.

Thesis (Ph. D.)--Illinois State University, 1984. / Title from title page screen, viewed May 20, 2005. Dissertation Committee: Harry Huizinga (chair), Marcia Miller, Tak Cheung, Mathew Nadakavukaren, Anthony Liberta. Includes bibliographical references (leaves 209-222) and abstract. Also available in print.

Thesis (M. Phil.)--University of Hong Kong, 1998. / Includes bibliographical references.

Thesis (M.Sc.)--York University, 2007. Graduate Programme in Biology. / Typescript. Includes bibliographical references (leaves 64-74). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR38771

Temperature resistance was measured in goldfish which had been maintained under controlled photoperiods during different seasons over a twelve month period. A consistently higher heat resistance was found in fish which had been kept under the longer photoperiod. The cold resistance of short-day fish was greater than that of long-day fish in the fall and winter, but in the spring and summer the relationship seemed to be reversed. Thyroid uptake of radioiodine was determined in fish which had been subjected to the same photoperiod treatment. Short-day fish showed a consistently higher uptake of I¹³¹ , although the differences were not statistically significant. Photoperiodically adapted fish treated with thyroxine or TSH showed increased resistance to cold. Thiouracil caused the reverse effect, but thiourea caused increased resistance in the long-day group. Tissue cholesterol analyses were carried out on fish treated with thyroid materials. Gonad weight/body weight relationships were compared in fish maintained under the two photoperiods to determine possible correlations between the state of sexual maturity and thermal resistance. / Science, Faculty of / Zoology, Department of / Graduate

A group of five goldfish, Carassius auratus, treated ten and sixteen days with a 1: 3,980,000 concentration of synthetic sodium thyroxine during the winter, had their oxygen consumption significantly raised. Five goldfish treated with .03 per cent thiourea for the same lengths of time during the same period had their oxygen consumption significantly depressed. Two series of similar treatments of three, seven, fourteen and twenty-one days duration throughout the summer did not statistically alter the oxygen consumption and ammonia excretion. Treatments with a 1: 1500,000 concentration of methyl testosterone for three, seven, fourteen and twenty-one days statistically elevated the oxygen consumption and ammonia excretion. The thiourea, synthetic sodium thyroxine and methyl testosterone treatments for three, seven, fourteen and twenty-one days did not appreciably alter the total lipid and moisture content of the goldfish tissue. These treatments do not appear to alter the oxygen carbon dioxide tension at death nor the length of time to asphyxiate the goldfish. / Science, Faculty of / Zoology, Department of / Graduate