Hybrids?

[duanes]

Hybrids in "nature" are subject to the pressures of survival of the fittest, with weak and substandard individuals being killed by the forces of nature, and in so doing, only robust individuals survive, and spawn.
In aquariums, more often than not, substandard (although they may be colorful) individuals survive because lack predatory pressure, and even more damaging, the use of antibiotics. (duck lips anyone?)
And in amateur aquarist tanks, the lack of proper culling, which allow weak immune system individuals to pass of even weaker genes.
Although not a hybrid, consider the Electric Blue Dempsey, bred for color, yet in general, a very weak and easily compromised variant.

 

[duanes]

Hybrids in "nature" are subject to the pressures of survival of the fittest, with weak and substandard individuals being killed by the forces of nature, and in so doing, only robust individuals survive, and spawn.
In aquariums, more often than not, substandard (although they may be colorful) individuals survive because lack predatory pressure, and even more damaging, the use of antibiotics. (duck lips anyone?)
And in amateur aquarist tanks, the lack of proper culling, which allow weak immune system individuals to pass of even weaker genes.
Although not a hybrid, consider the Electric Blue Dempsey, bred for color, yet in general, a very weak and easily compromised variant, that'll die if you look at it crosseyed.

 

[Deadliestviper7]

Hybrids in "nature" are subject to the pressures of survival of the fittest, with weak and substandard individuals being killed by the forces of nature, and in so doing, only robust individuals survive, and spawn.
In aquariums, more often than not, substandard (although they may be colorful) individuals survive because lack predatory pressure, and even more damaging, the use of antibiotics. (duck lips anyone?)
And in amateur aquarist tanks, the lack of proper culling, which allow weak immune system individuals to pass of even weaker genes.
Although not a hybrid, consider the Electric Blue Dempsey, bred for color, yet in general, a very weak and easily compromised variant, that'll die if you look at it crosseyed.

That example is a perfect example of why you should cull fry of any species, subpar and messed up fry make good feeder fish tho

 

[markstrimaran]

The solid blue Mbuna african cichild, going on to the 4th generation of line breeding.