once is an accident
twice is a coincidence
three times is a
pattern
no, you don't have to cull every hybrid. yes, its a good thing that she wants to provide for them now that they are here. but its not responsible fishkeeping to continually produce unpredictable hybrids that you may or may not be able to rehome!!
the definition of a
species is a group sharing strongly similar characteristics that
interbreeds sucessfully--meaning they produce
consistently fertile offspring. two fish that are typically regarded as different species, then suddenly start hybridizing in the wild and produce viable fy, are in fact just
sub-species (meaning two groups sharing mildly simliar characteristics that are capable of interbreeding sucessfully but typically don't). this is a case where science just got a little too clever. but if the wild hybrids cannot produce additional fry, then its really just a magnified and more tragic case of forced hybridization as seen in the home aquarium.
I'm a fish person, but my true love is reptiles. I get very nervous when people cross species of snakes. We're not talking the difference between 2 stipes and 5 stripes here, species seperated by bay, we're talking ball pythons and blood pythons, completely different continents...
its not too far off to compare different bays to being at least on opposing sides of the same continent. different rivers is an excellent analogy to different continents. and sometimes you
do see attempts at hybridizing fish from different continents. water conditions are essentially uniform in small volumes such as aquariums, but there can be immense differences in conditions (temperature, oxygenation, vegetation, microfoods) in lakes that are miles and miles long. even the water
chemistry can be vastly different, especially in rivers which are strongly dependent on the surrounding landscape for conditions.
However, the offspring produced by crossing reptiles are often better temperamented, more colorful, and hardier. I HAVE NO PROBLEM, and CAN SEE NO PROBLEM when the offspring are represented for what they are... hybrids
considering that Rift Lake species with pleasent temperaments are few and far between, odds are not in the favor of improved attitudes. the big problem with frequent hybridizing is really that
every hybridization attempt is a lost chance to reduce the capture of wild pure-strain cichlids. there are many species in the Rift Lakes that are facing severe population depletion due to the aquarium trade. there is also a lack of reputable breeders who can be relied upon for pure-strain cichlids, feeding the trade in wild-caught fish.
for the most part, hybrids should be accidents and coincidences. there are a few exceptions of course, but for the most part hybridization shouldn't be a pattern.