THE EFFECT OF TEMPERATURE VARIATION ON THE SEX COMPOSITION AND GROWTH OF PEOCILIA MELANOGASTER OFFSPRING

Document Type : Original Article

Authors

1 Zoology Dept, Minufiya University. Egypt

2 Anatomy II Dept,Dusseldorf University. Germany

3 Zoology Dept, Mansoura University, Egypt.

4 Zoology 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.

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Egyptian Journal of Aquatic Biology and Fisheries
Volume 5, Issue 4
September and October 2001
Pages 29-43

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