8 enantiopus Kilesa - F1 juvies. This one is starting to color up
Oh boy, are you in for some fun!
Enantiopus are wonderful fishes, and one of my all-time favourite Tanganyikans.
Enantiopus were previously assigned to the genus
Xenotilapia, and you can still find them under that name in older posts online. They were then reassigned to the monotypic genus
Enantiopus, with
E. melanogenys as the type species. Various forms of
E. melanogenys are found around most of the ~1400 mile circumference of the lake, but a distinct population with a yellow (rather than black) face occurs on the west side of the lake from Kalemie to Mtoa Bay. The taxonomic status of that population has changed over time, but it is currently recognized as a distinct species,
E. kilesa. Personally, I think that these two forms are subspecies.
This pic shows a young male in non-breeding dress from my
E. kilesa colony some time ago. As you can see, these are beautiful fishes, with all the attraction of
Xenotilapia, but far less aggressive and space-demanding.
Enantiopus are lek breeders, a breeding system in which males establish territories and make nests on the sand floor.
Enantiopus nests are typically 1-2' in diameter, but they are not isolated; on the contrary, the bottom is confluent with nests, so that every male is surrounded by competitors. In a concentrated, super-sized breeding colony of this sort, aggression between males has evolved to be highly ritualized, so although border skirmishes occur routinely, they rarely result in physical damage to any of the competing males, even in captivity. Meanwhile, the females get to cruise around, mating with males of their choice, and carrying multipaternal broods. Evolutionarily speaking, everyone wins. Including the fish-keeper.
This makes for very interesting tanks. I currently have a 125g with 5-6 co-dominant males of
Enantiopus melanogenys, each with his own nest. The females occupy most of the open space in the water column, except when breeding. The spawning behaviors are non-stop, but I have never observed physical damage to any of these fishes, male or female. Fry typically number 10-15 per brood, and I have several broods from earlier this year that are now about 2.5"TL, and starting to color. Fun!
E. melanogenys-