Pacu fish (Colossoma macropomum)

Pacu fish (lat. Colossoma macropomum) is a freshwater ray-finned fishes kind from the subfamily Serrasalminae, Characidae family, or (according to another classification) from Serrasalmidae family, the only kind of Colossoma genus. It is one of the piranha families known for its blood lust. But unlike its “cousins” and despite a strong and massive body, this fish prefers plant food and belongs to the herbivorous class.

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Giant gourami (Osphronemus goramy)

The giant gourami (lat. Osphronemus goramy) is the largest fish from all gourami species kept in tanks. In the wild, it can grow up to 60 cm (24 in) long and even larger, according to some data. In tanks, it grows a bit smaller, about 40-45 cm (18 in), but still, it is a very large fish.

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Motoro stingray

Motoro stingray or ocellate river stingray (Lat. Potamotrygon motoro) is one of the most famous and popular freshwater rays. We should mention that despite the motoro stingray popularity in aquarium husbandry, there is still no quite precise classification of this family representatives.

From time to time, some new kinds are discovered, which were not described before.

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