The purpose of hybridization here is to create a hybrid as a profitable food fish (and then we get the refuse from the farming operations), as, say, opposed to hybridization of synodontis catfish, which is done to make money in the ornamental fish trade. LSN is too skinny of a fish, too slow growing and too small-growing to be a viable candidate. So South American and SE Asian experimenters only dabbled into LSN to cover their bases, hence, ~ none is available.
I don't suppose they are all that viable either. Statistics is against it. 1 in 1000 kinds of hybrids turns out viable enough for a farming production. The only really successful ones have been so far TSN x RTC and TSN x Leiarius marmoratus, it seems from what's available.
RTCxTSN (where RTC is a mother),
LeiariusxTSN,
RTCxparoon,
RTCxLeiarius,
LeiariusxRTC,
LSNxRTC,
and literally thousands of other combinations of primarily large-growing Pimelodidae catfish
are not viable, not a strong, hardy fish. Just because 1 in a million survive into adulthood and we see them very rarely doesn't make them viable offspring.
NOTE: Mother must be listed first, father second. So the common hybrid is TSN x RTC, not at all RTC x TSN. Mother is Pseudoplatystoma fasciatum. Father is RTC.
The majority of offspring's traits are dominated by motherly genes. Not a 51% majority but looks like 80%-90%.
My personal objection is based on moral, not aesthetics.
Both are widely available. Tigs are pricey $150-$250. Tigs grow to about 24"+ TL (total length). Cat-eLog lists SL standard length, excluding the tail fin. I've heard of only one tig reaching 3'. Probably an exception. Like a 7' human.
Cephalosilurus species, all three, are a swimming mouth. They will eat everything in your tank and ask for more.
Never heard of the Blackest catfish. What's its science name?
Oxydoras niger?
vincentwugwg
has a leucistic one and I am sure will disagree 
