- Genus Petrochromis dwells
in a shallow rocky biotope and it is very numerous in the lake. However, it
is not much present in the tanks of breeders, since these fish are rather
difficult to breed. Some species grow up to larger size and we cannot
neglect the fact of their inner
species aggressiveness. I have managed to breed Petrochromis trewavasae
successfully having just about 30 fish in a breeding group. The tanks were
180 cm long or even longer, with 700 – 800 litre of water.
These algofagous species have got well
adapted lips with numerous thin teeth to scratch seaweed from rocks. Even if
I have tried to keep majority of plant in feeding and have rich feeding,
the number of breedings of caught fish has come down a little step by step.
Such a finding made me believe these fish live from the nature and they
gradually lose some of the substances gained when living in the wild. This
is obvious when having a closer look at breedings. This feature is, however,
not dominant just with genus Petrochromis, it is also visible with