Study of the case hermaphrodite and Sex reversal in the yellow fin sea bream Acanthopagrus latus in AL -Razaza lake

Abstract

The phenomenon of protandrous hermaphrodite and sex reversal has been studies in Acanthopagrus latus that is currently available in Al Razaza lake which fished by gill nest or cast net . A sample of 161 was chosen for the period of begining of August 2008 up to the end of January 2009 . Through this study , the fish gender and its sexual maturation were limited , and a studying monthly varieties of gonads function values GSI and liver function HSI and studying fish length at the first sex adulthood . The study also included the external and structure descriptive of the fish gonads . It was notices , according to the study , that the sex proportion was 38.51 for males and 44.72 for females and 16.77 for the hermaphrodite . The statistic analysis results showed that there are no moral differences between the observed and expected sex proportion ( p >0.05 ) . For the male proportion to the female in the total gathering is 1:0.86 ; it was noticed that the proportion tends to for the female with the age progress .this refers to the sex diversion from the male to male protandrous . The monthly changes in gonad function values of males and females showed that the increase in GSI values of both sexes start from September with a continual increase till reach the highest value in January 1.47 for male and 2.30 for female . The monthly change of the liver function showed that the increase in HSI values start from September with a continual increase reaching the top in January to 2.11 for male and 2.26 for female. The external examination for the Acanthopagrus latus gonads identified three types of gonads male , female and hermaphroditic .