腹大眼非鲫

Overview

The extended male pelvic fins and many locality color forms make Ophthalmotilapia ventralis distinctive. Its fairly peaceful ordinary behavior should not obscure the space required by a breeding male's territory.

Distribution & habitat

Endemic to Lake Tanganyika, it occupies much of the shoreline, although some areas remain incompletely surveyed. Shallow rocky margins adjoin open feeding space where plankton is taken.

Aquarium setup

Use scattered rocky shelters while preserving broad swimming areas and exposed sand. Mature biological filtration is essential; suitable hard-water plants or wood are optional. The layout needs to support nest building and female escape rather than filling the entire tank with stone.

Diet & feeding

Plankton forms part of the natural diet. Most captive foods are accepted, but protein-heavy offerings should be avoided. Include vegetable components such as spirulina preparations or softened spinach.

Behaviour & compatibility

Calm companions are preferable. More forceful fishes may suppress activity and male coloration. Usually keep one male with several females unless space is exceptional. In nature, dominant males build nests while subordinate males and females group together; that arrangement should not be assumed workable in a small aquarium.

Sexual dimorphism

Males become larger and more vividly colored, with longer fins and particularly elongated pelvics.

Breeding

The male excavates a craterlike sand nest or transports sand onto an elevated flat rock. The female gathers eggs immediately and responds to the egglike structures at his pelvic-fin tips during fertilization.

Maternal oral incubation lasts approximately three to four weeks without feeding. Repeated capture or inspection can cause premature release or brood loss. Any decision to move her should weigh harassment against disturbance and the social consequences of returning after an absence. Released fry can immediately take Artemia nauplii and finely crushed spirulina flakes.

Notes

Locality forms interbreed readily. Keep breeding lines separate and retain provenance rather than using a commercial color label as a substitute for reliable identity.