Sometimes you can and sometimes you cannot. It really depends, but typically the fish resembles two unrelated species. There are some known hybrids that make identifying some of these more easily, like red zebra x yellow lab. Honestly, it is a case by case basis though.cvillanueva21 said:How can you tell if a fish is a hybrid?
Some say they exhibt higher levels of aggression. There is a known issue with a red tail cat x shovel nose cat that causes the vertebrae to be formed in a manner that could affect the fishes movement and comfort. If distributed they can have a negative impact on the hobby by making it difficult to find pure specimens, again the red zebra x yellow lab cross is a good example. Another example of this is the M. cyaneorhabdos x M. johannii or M. interruptus mixes.Is there anything wrong with them?
As far as hybrids? It is really difficult to predict what would and would not work in a setup.Any firm rules on what not to stock together?
Okay for them to be a hybrid, or okay to not worry about hybridization?If they have a different Genus name is that okay?
(Wondering about a "red zebra" and an electric yellow lab)
This helps, but with Malawi species it is not a guarantee, again, Metriaclima estherae x Labidochromis caeruleus cross is an example. Keeping fish with proper ratios (1M/3-4F) also helps to avoid hybridizations. The only way to guarantee is to have single species setups. Avoiding fish with similar males/females is helpful as well.cvillanueva21 said:If in their binomial nomenclature, they have different genus names would it be okay to stock them together and not worry about them breeding and causing hybrids.
Correct, this can, but not always, have the highest hybridization chance.I'm guessing if they have the same genus name but different species it's not advisable to keep them together?
Yes, depending on the line, they either look like red zebras with blue markings in the face and a more pointed mouth, or they are the "All Yellow" breed that looks like a yellow lab with no black marking in the fins.[/quote]You mentioned red zebra and electric yellow labs having hybrids. Do you know how those look like? The juvis I got came from a tank with those two species.