World Aquaculture Society Meetings


Your browser does not support the most current secure communications protocol. The World Aquaculture Society is committed to the security of your private information. In order to accept credit card data on this site we are recquired to be in compliance with Payment Card Industry (PCI) standards. Current PCI standards will not allow us to accept traffic from browsers that do not support TLS 1.2 after June 30, 2018. We are alerting you to the important need to update your browser. Changes to our web server made on or before June 30, 2018 will make unavailable with the browser you are currently using. [More..]

Add To Calendar 27/04/2016 11:40:0027/04/2016 12:00:00Africa/JohannesburgAsian-Pacific Aquaculture 2016EFFICACY OF COMMON CARP Cyprinus carpio TESTIS ENDUCING SEX REVERSAL OF NILE TILAPIA Oreochromis niloticus Diamond 3The World Aquaculture Societyjohnc@was.orgfalseanrl65yqlzh3g1q0dme13067DD/MM/YYYY


Rahul Ranjan, Narayan P. Pandit*, Nabin B. Khanal, Madhav K. Shrestha,
 and James S. Diana
 Department of Aquaculture and Fisheries
 Agriculture and Forestry University, Rampur, Chitwan, Nepal

Sex reversal of Nile tilapia (Oreochromis niloticus) using 17α-methyl testosterone is the most commonly used method. An experiment was carried out to explore the possibility of using common carp (Cyprinus carpio) testis as natural androgen source as an alternative for sex reversal of Nile tilapia fry. Six diets containing different proportions of dried common carp testis (CCT) were fed to sexually undifferentiated fry in aquaria for 25, 30 and 35 days. Feed types included 0% (Control), 50%, 65%, 80%, 95% and 100% dried CCT mixed with fish meal. After treatment, fish were transferred to nylon hapas suspended in an outdoor concrete tank and fed with normal diet until they reached 160 days of age.

Feeding CCT to Nile tilapia fry during the critical period of sex differentiation increased the fraction of male fish in a dose-dependent manner (Table 1). The highest proportion of males was 95.8±4.2% grown on the diet of 100% CCT for 30-35 days and lowest proportion was 62.5±7.2% on the diet with 50% CCT fed for 25-30 days. There were significant differences in male proportion with different diets but the differences in male proportion over different times of exposure were not significant. This experiment clearly demonstrates that common carp testis can efficiently masculinize Nile tilapia fry when fed for at least 30 days after hatching. However, it suggests a need for further study on 100% CCT feed and duration of feeding.

Copyright © 2001-2018 World Aquaculture Society All Rights Reserved.