S. leucosticta is frequently available in the ornamental trade and farmed for the purpose in several countries. It is often confused with its congener S. jurupari in aquarium literature and on websites, but is easily recognised by presence (vs. absence) of prominent white spots or vermiform markings on the sides of the head.

Although the presence of white spots on the head does not distinguish it from all known Satanoperca populations (see below), it can…

This species is relatively rare in the ornamental trade, where it is sometimes confused with its similarly-patterned congeners S. daemon and S. lilith. These three species all possess 1-3 dark blotches on the side of the body and a relatively large ocellus on the upper caudal-fin base, characters that immediately separate them from the remainder of the genus which lack blotches on the body and have a relatively small ocellus on the upper caudal-fin base.

There are currently 24 described species of Serrasalmus, many of which look superficially similar. S. serrulatus occupies a particularly confusing taxonomic position and is very tricky to identify positively. According to scientific literature it is very close in appearance to several congeners, most notably S. eigenmanni, S. hollandi, S. humeralis and S. nalseni. The separation of these is largely based on geographical range and it's possible that some of them may turn out to be synonymous…

S. altuvei is very scarce in the hobby, most commonly being found among imports of juvenile S. rhombeus (the type species of the genus). It's also known as the "Caribe azul" or "blue caribe" in the trade. There are currently 24 described species of Serrasalmus, many of which look superficially similar. This one is considered a member of the "compressed group". This grouping of morphologically similar species currently comprises S. altuvei, S. geryi, S. compress…

There are currently 24 described species of Serrasalmus, many of which look superficially similar. S. sanchezi has frequently been confused with S. spilopleura in the past, and is sometimes still sold as "Spilo cf" or "Ruby-red Spilo". It actually appears to be more closely related to S. rhombeus or S. irritans than S. spilopleura. The characteristic red throat has also led to it being confused with S. medinai and even the red-bellied piranha Pygocentrus nattereri on occasion…

An interesting addition to the Tanganyikan community that is not often seen in the hobby. There is a rumour that this cat can secrete a poisonous mucous when stressed that can kill other fish in the aquarium but this has not yet been 100% confirmed. It may be wise to keep it in as large an aquarium as possible just in case. There are currently just 4 species of Lophiobagrus described. All are from Lake Tanganyika….

This is not a particularly common species in the trade, probably as it's not especially attractive to look at and grows very large. It's unsuitable for all but the biggest aquaria.

One of the largest freshwater fish species found in Africa, this is not a very good aquarium inhabitant. It is suitable only for the truly dedicated hobbyist able to house it properly or for public aquaria. It can be distinguished from similar members of the genus by its very long adipose fin….

An incredibly hardy species, the walking catfish is tolerant of a very wide range of water chemistry and temperature. It can also survive in oxygen-depleted conditions due to its ability to breathe atmospheric air. In fact, it is thought that the fish can literally drown if deprived access to the water surface for long enough.

The common name is derived from its natural ability to move across land using its stiff pectoral spines, provided it stays damp. It has special mucous-producing pores …

Etroplus is the only cichlid genus native to the Indian subcontinent and Sri Lanka and currently comprises three species among which E. canarensis is uniquely limited to freshwater and restricted in range.

Its congeners E. maculatus and E. suratensis are both euryhaline inhabiting estuaries, coastal lagoons and the lower reaches of rivers around coastlines of western and southern India plus northern Sri Lanka.