Lake Malawi Species • Auratus & Gender Change

Discussion regarding only Lake Malawi species.

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Postby 24Tropheus » Tue Apr 20, 2010 1:30 pm

Kanorin wrote:Also note that they observed male : female ratios in their F1 broods of approximately five to ten females per every male. Those high female to male ratios are not common in most tank-raised african cichlid broods. Perhaps it suggests that the Met. Livingstoni species has more hormonal cross-talk (or whatever factor is mediating these gender changes) than the average cichlid.

Very good point I wonder is there anything about auratus that makes it a likely candidate. Ie a naturaly scewed sex mix towards female and females turning into males only after finding the males to be in short supply? Nope not on my keeping of em males seem to be quite (maybe too) frequent. :oops: :)

But the selfish gene theory might suggest that any Mbuna that can breed as a male (can exert dominance in the case of auratus) should sex change from female (when domininant) for its own breeding advantage. They can get an awful lot more fry as a male with very little extra effort if already dominant as long as there are willing females available and not too much in the way of other male competition. :wink:

For sure auratus is not a shy peaceful Mbuna afraid of a high risk high reward strategy for reproduction and dominance.

All the best James
Tanks 180, empty revamping 100,65,60g Tropheus/tang communities 75g revamping. 29gx3 shelly communities, 29g Trigs breeding. 20gx2 shelly tanks. BCA member 207. Try it you might like it.
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