By Mary Bailey, Gina Sandford
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There is no parental care, the eggs being left to fend for themselves. In the community aquarium such a bounty of food sends the other occupants scurrying about in search of eggs and the parents will even eat their own spawn. Successful breeding can be achieved in a specially prepared breeding aquarium so the eggs can be scattered over marbles, through mesh, or in plants, and the parents removed before they can consume the fry. You will need plenty of live food and a lot of space to raise the fry, as a single pair of B.
There is a small African Labeo that is highly prized among aquarists, L variegatus (harlequin shark, variegated shark). Growing to only 30 cm (12 in) at most, it is much more manageable and much more attractive as a juvenile. Youngsters are mottled dark brown over a light cream to beige background and there are traces of orange/red in their fins, but as the fishes mature they lose this colouring and turn grey. Small specimens tolerate other fishes but they can become aggressive when mature. It is one of those fishes that are best grown up along with their tankmates rather than trying to introduce medium- to large-sized fishes into the adult shark's territory.
Phoxinus phoxinus (minnows) are common in unpolluted European streams. Given clean, cool, well-oxygenated water they can be a welcome addition to the aquarium. The males of N. lutrensis are far more colourful than the silvery females. During the breeding season, the male develops tubercules around his snout. The fishes breed over sand, the pair depositing their eggs and then leaving them to fend for themselves. Phoxinus erythrogaster is a very colourful fish that displays best if kept in a shoal.