GIFT oreochromis niloticus breeding method?

Question

tilapia fish breeding method and technique for making all male for culture in ponds

Answer 1

Breeding tilapia:

http://www.aquarticles.com/articles/breeding/Berg_Tilapia.html
http://www.ag.auburn.edu/fish/international/reprobiology.htm
http://www.gcca.net/fom/Oreochromis_niloticus_baringoensis.htm

Breeding is the easy part. I wasn't able to find good info in a fast search for environmental searches on sex determination in the fry. This technical paper shows that there is more than just a normal 50/50 ratio, but didn't determine a causative factor. It does mention some factors showing weak correlations, though: http://pdacrsp.oregonstate.edu/pubs/technical/18tchhtml/8RCR1C.html

If I find more, I'll post an addition.