Spontaneous diplodization of maternal chromosome set in the Nile Tipapia (Oreochromis niloticus L.)

Tariq Ezaz, Brendan McAndrew, David J. Penman

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Abstract

Spontaneous diploidization of the maternal chromosome set (SDM) in Oreochromis niloticus is described here for the ¢rst time. The SDM phenomenon was observed in progeny of only one XY neofemale out of 11 such neofemales from which eggs had been fertilized with UV-irradiated sperm: this treatment produced only the expected haploid embryos from the other females. SDM progeny were produced from three different batches of eggs from this female. No significant differences in survival at different stages of embryonic development were observed between the SDM and the diploid control group. The maternal inheritance of SDM progeny was verified using multilocus DNA fingerprinting. Only diploid karyotypes were observed in these ¢sh and diploid control groups. In both the SDM and control groups, sex ratios were significantly
skewed towards males (93.3% and 65.0% males respectively). The actual mechanism of SDM in eggs from this particular female remains unknown
Original languageEnglish
Pages (from-to)271-277
Number of pages7
JournalAquaculture Research
Volume35
Issue number3
Publication statusPublished - 2004
Externally publishedYes

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