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RE: dodgy RAC

On 3 Oct 2001, at 16:10, Rudolph Terblanche wrote:

> When Guy said that a male Notho will drive any female 
> to spawn, I remembered that sometimes you get more than 
> one Notho in the same pool in the wild. How do they 
> breed true, without breeding with the wrong female. 

A male notho will not drive just any female, and any 
female won't just spawn with any male. There is some 
mate selection going on intraspeciesly.

Second, where mating in the wild occurs the embryoes 
nornmally don't make it. This is built into the 
definition of a species (reproductive and/or geografical 
isolation). An example is the cross made between ORT and 
RAC. The resulting fish while alive were sterile. The 
breeding was also forced under unnatural circumstances. 
There are inbuilt measures to make sure hybrids don't 
make it in the wild, under the circumstances the fish 
exist in naturally.

> There must be some way that they know.

The wide array of male colours and patterns is definetly 
a signal...

Bye

Tyrone Genade
tyronegenade at yahoo_com
http://www.tyronegenade.0catch.com

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