THE EFFECT OF TEMPERATURE VARIATION ON THE SEX COMPOSITION AND GROWTH OF PEOCILIA MELANOGASTER OFFSPRING | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 3, Volume 5, Issue 4, September 2001, Page 29-43 PDF (674.78 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2001.1707 | ||||
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| Authors | ||||
Elsayed Khallaf 1; D. Passia2; Ahmed Abdccn3; Feryal Mcsady4
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| 1Zoology Dept, Minufiya University. Egypt | ||||
| 2Anatomy II Dept,Dusseldorf University. Germany | ||||
| 3Zoology Dept, Mansoura University, Egypt. | ||||
| 4Zoology Dept, Minufiya University. Egypt. | ||||
| Abstract | ||||
| The sexual differentiation of P. melanogaster embryos was examined among fish kept in glass aquaria (80x40x35 cm) at 23, 26and29°CwithapH=6.5.Analysis of variance of the data revealed a significant variation (at the 5 % level) of sex composition relative to increase of water temperature .Two mathematical representations were predicted for males and females.Accordingly, the degrees at which all males, or all females, or 1:1 sex ratio had been determined was 18.95, 32.01 and25.4°C respectively. The mechanism of this temperature effect on the sex ratio was discussed where growth offish was suspected to have played a role in this process. | ||||
| Keywords | ||||
| Temperture; sex composition; Growth; offspring; Peocilia | ||||
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