Inhabits rocky habitat with caves and crevices along the shores of Lake Malawi.
Geographic distribution:
Restricted to the rocky coast north of Lundu on the eastern side of the lake and north of
Mundola Point on the western side.
Typical adult size:
Up to 11 cm total length; females typically reach about 9 cm.
Sexual dimorphism:
Males display bright powder-blue to royal-blue coloration with faint vertical barring and black
pelvic fins edged in white, often with 1–3 yellow egg-spots on the anal fin; females are yellow to
grey-white and lack the intense blue coloration of males.
Recommended aquarium size:
An aquarium volume of 300 L with a minimum tank length of 120 cm is recommended.
Aquarium setup:
Aquarium should replicate rocky habitat with abundant caves and shelters formed by rock piles,
providing territories and hiding places.
Diet:
Primarily herbivorous; grazes aufwuchs and epilithic algae from rocks using scraping motions,
and may opportunistically consume small invertebrates or plankton.
Breeding:
Oviparous maternal mouthbrooder. Males establish and defend territories in rocky caves and excavate
shallow nests; females incubate fertilized eggs in the mouth for about 25 days before releasing
free-swimming fry.
Aggression:
Intraspecific aggression is pronounced, particularly among territorial males; generally tolerant
toward other species when adequate space and shelter are provided.
Special notes:
Characterized by a slender body, bicuspid outer jaw teeth and a narrow ventral mouth adapted for
grazing algae from steep rock surfaces at angles of about 60°. T. gracilior was before known as
T. sp. ‘black’.
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