Theses and Dissertations

Title: An evaluation of two possible methods for inhibiting reproduction in the white amur, Ctenopharyngodon idella (Valenciennes)

Name: Johnson III, Malcolm C

Degree: MS

Chair: Dr. John M. Lawrence

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1972

Pages: 53

Keywords: Inhibiting Reproduction,White Amur,Ctenopharyngodon idella (Valenciennes).


Measurements of various external anatomical features were made on forty-one sexually mature White Amur. The measurements were treated as ratios to standard length or to another dimension of the organ involved and statistical analysis was performed to determine if any significant differences existed between the sexes. Six of the ratios exhibited significant differences above the ninety-five per cent level of which length of base of the anal fin/standard length and length of the pectoral fin/standard legnth were the most highly significant. The degree of overlap of these values between the sexes was very high.Cross sections from gonads of immature White Amur were stained and mounted on slides at six week intervals to determine the approximate age of gonadal differentiation. At age ten months primary oocytes had appeared. Crystalline methyl testosterone was mixed in feed at 20 ?g per gram of feed and fed to one hundred immature White Amur for a period of eighty-eight days. After thirteen months the testosterone-fed fish were fifty per cent smaller than the controls and exhibited little gonadal development. Survival was not significantly affected. The experimental fish must reach the age of sexual maturity before final effects of the hormone can be ascertained.

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