Production of Putative YY Supermales of Nile Tilapia Oreochromis niloticus and their Performance in Propagation of Genetically Male Tilapia (GMT) Seed

By : Muhammad Zahirul Islam , Rafiqul Islam Sarder , Rafiqul Islam Akhand

Page No: 177-194

Abstract
Identification and propagation of putative YY supermales of Oreochromis niloticus and their performance in production of genetically male (GMT) seed was studied. One hundred fry supposed to be YY male were collected from Philippines and reared in ponds. Out of 10 fish mated with normal females (XX), 9 were identified as putative YY males. Four YY males were mated with females (XX) and the progeny (XY) was feminized with ?-estradiol. Twenty-four feminized fish were progenty tested and 17 were identified as sex- reversed females (XY). For YY female production, 6 sex-reversed females (XY) were mated with YY males and the progeny (XY, YY) were feminized with ?-estradiol. Upon progenty testing of 29 feminized fish, 8 were identified as YY females. Mating between 3 YY males and 3 YY females produced 98.6 to 100% males. Twenty-one YY males from this broodstock were progeny tested and 18 were identified as putative YY males those produced 81.6 to 100% male.The progenies obtained were considered as GMT and showed higher growth and survivability.

Authors :
Muhammad Zahirul Islam
Niharika Fisheries and Hatchery, Tarakhanda, Mymensingh, Bangladesh.

Rafiqul Islam Sarder
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Rafiqul Islam Akhand
Innovision Consulting Private Limited, House-62, Road-3, Block-B, Niketan, Gulsan-1, Dhaka-1212, Bangladesh.
 

DOI: http://doi.org/10.32381/JAT.2021.36.1-4.16