Interactions of hormones and gonadal development of Tilapia aurea fry /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1985.
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| Subjects: | |
| Online Access: | Link to ProQuest copy Link to OAKTrust copy |
| Abstract: | Gonadal differentiation of Tilapia aurea fry reared under various photoperiods was studied. Histological sections were made of fry gonads from the first free-swimming day through day 20 from samples taken every other day. Three feeding treatments were used for each photoperiod: no hormone, 17-[alpha]-ethynyltestosterone, and 17-[alpha]-ethynyl-estradiol. Statistical analyses show no significant difference in percent of differentiated and non-differentiated fry among the photoperiods. There also was no significant difference in size of fry for each feed treatment among the photoperiods. Fry treated with 17-[alpha]-ethynylestradiol initiated differentiation four days earlier than females not receiving hormone. Males fed 17-[alpha]-ethynyltestosterone initiated differentiation two days earlier than non-hormone treated fry. There was no significant difference in percent of differentiated to non-differentiated fry by age but there was a significant difference in size by age. Differentiated fry were significantly larger than non-differentiated fry. Fry treated with 17-[alpha]-ethynyltestosterone were significantly larger than male fry not receiving the hormone and females, which included both those fed 17-[alpha]-ethynylestradiol and those not given this hormone. Females fed 17-[alpha]-ethynylestradiol were not significantly different in size from females not receiving the hormone. |
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| Item Description: | "Major subject: Wildlife and Fisheries Sciences." Typescript (photocopy). Vita. |
| Physical Description: | xi, 85 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references (leaves 58-62). |