The Israeli Journal of Aquaculture Bamidgeh 56(3), 2004, 159-165

FERTILITY PROBLEMS IN THE SECOND GENERATION OF A 
FOUR-SPECIES TILAPIA CROSS 


Gideon Hulata1*, Avner Cnaani1**, Tatiana Slossman1 and Graham A.E. Gall2

1Agricultural Research Organization, Institute of Animal Science, Department of Aquaculture, 
P.O. Box 6, Bet Dagan 50250, Israel

2Department of Animal Science, University of California, Davis, CA 95616, USA



(Received 6.12.03, Accepted 9.3.04) 


Key words: fertility, multi-species hybrid, Oreochromis spp., Sarotherodon galilaeus
sterility, tilapia 



Abstract


Reproductive problems were encountered in attempting to produce the second generation of a four-way cross of tilapia from interspecific F1 hybrids. The cross (Oreochromis mossambicus x O. aureus) x (Sarotherodon galilaeus x O. niloticus) successfully bred for one generation, however, not even a single batch of progeny was obtained in the subsequent generation. It was concluded that the complex genetic structure of this cross caused the fertility problem. Any similar breeding programs that are based on multi-species crosses should take into consideration that reproductive problems may occur. 


* Corresponding author. Fax: +972-3-9605667, e-mail: vlaque@volcani.agri.gov.il
* Current address: Hubbard Center for Genome Studies, University of New Hampshire, Gregg Hall, 35   Colovos Road, Durham, NH 03824, USA

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