I am not aware that firewoods are farmed on a large scale. I'd not think so.
It is second to the most messed up I've ever seen. Painful to look at. Looks like a roadkill.
The whole batch is hard to rationalize indeed. I think / I've read others say that firewoods may be used in the farming experiments and perhaps are thrown in the ponds where TSNs are bred too in SA. Too much uncertainty.
I am almost afraid to think someone is playing with them to produce some that "appeal to the customers who are bored with the usual-looking stuff", you know, in the (harmful IMHO) spirit of hybridization, fish tattooing, coloring, scarring, etc. Sadly, people get bored soon and need a "wow" moment, like a drug, and in the worst cases even a "bad" wow suffices; it leads to a perversion of taste and down-spirals from there on. Like some kings e.g., of France had to have mutant humans, e.g., people with too many digits, limbs, two heads, quasimodos, siamese twins, etc. in their courts.