Correlation between the sperm quality and selection for higher growth rate of Nile tilapia (Oreochromis niloticus)

Kamel, Ebtehag; Sakr, Saleh Fathy

doi:10.21608/eja.2012.33233

Correlation between the sperm quality and selection for higher growth rate of Nile tilapia (Oreochromis niloticus)

Authors

Ebtehag Kamel ¹
Saleh Fathy Sakr ²

¹ Genetics and Breeding Department, Central Laboratory for Aquaculture Research, Agricultural Research center, Abbassa, Egypt.

² Fish Diseases Department, Central Laboratory for Aquaculture Research, Abbassa, Abo-Hammad, Sharkia, Egypt

10.21608/eja.2012.33233

Abstract

Random sample consisted of fifty males' brood stocks fish from the fifth generation of mass selection for higher growth rate and fifty males from non selected group of Nile tilapia (Oreochromis niloticus) were used to study the sperm quality. No significant differences were recorded between the selected and non selected fish for length, weight and width. Significant differences were recorded for motility time of sperm between the selected and non selected fish. The percentage of live sperm was higher significantly in non selected group than the selected group. Both head and tail abnormality percentage were higher significantly in selected fish than non selected fish sperm. The correlation coefficient between tail abnormality of sperm and dead sperm was strong significant for non selected fish, while it was weak for selected fish. Strong correlation coefficient was observed for selected fish and moderate for non selected fish between tail and head abnormalities. Negative correlation coefficient between pH and head abnormality of sperm was recorded for selected fish whereas, it was positive and very weak for non selected fish sperm. Moderate correlation was revealed for non selected fish for pH and tail abnormal, in the same time it was negative for selected fish. Negative correlation coefficient was observed between pH and sperm motility for both selected and non selected fish. Negative correlation coefficient was noted for selected and non selected fish for motility time and both live and dead sperm. Motility time and head abnormality of sperm showed positive correlation coefficient moderate for selected and weak for non selected. Motility time and tail abnormality of sperm revealed positive correlation for selected fish and negative for non selected fish.

Keywords