Eretmodus cyanostictus "Ulwile Island"

Ulwile Islandoo-LWEE-leh EYE-land (approx.)

The fish

How this cichlid is built, and everything about how it lives, eats and breeds, is shared with the species — this page doesn't repeat it.

Read the full Eretmodus cyanostictus account →

Specific to Ulwile Island

  • Collection locality & coordinates
  • Local coloration — best judged from the living-fish photo
  • Kept as a single-provenance line, never crossed with other collection points

Care facts below are the species' — shared with Eretmodus cyanostictus.

IUCNLEAST CONCERN · 2025
CARESNOT LISTED
Scientific size3.5 in9 cm total length
Temperature75–81 °F24–27 °C
pH7.8–9alkaline
Depth0–10 ft0–3 m
Dietherbivore — grazes algal aufwuchs from rocks in the wave-washed surge zone
Breedingbiparental mouthbroodersmall, ~10–25 eggs
Sexual dimorphismYesweak; sexes very similar — venting needed
PhotographsSee photosGoogle Images →

The Ulwile Island population

Eretmodus cyanostictus "Ulwile Island" is the Ulwile Island population of Eretmodus cyanostictus, a geographic colour form from the Tanzania coast of Lake Tanganyika in the north-central part of the lake. It is the same species as Eretmodus cyanostictus, distinguished by its collection locality and local coloration; aquarists keep and breed it as a discrete, provenance-labelled line.

Colour reference: living Ulwile Island fish at tanganyika.si

About the species

Eretmodus cyanostictus, the Tanganyika clown or striped goby cichlid, is a small, stout-bodied fish endemic to Lake Tanganyika that lives where almost nothing else does: the wave-battered surge zone in the first meter or two of water along rocky shores. To survive the surf it has traded buoyancy and swimming ability for a heavy body, a reduced swim bladder, and a habit of hopping over the rocks like a marine goby. Most remarkably for a mouthbrooder, it is a monogamous biparental species in which the female and then the male each carry the brood in turn, a rare arrangement that has made it a favorite subject of behavioral research.

Full Eretmodus cyanostictus account →

Sources

  1. tanganyika.si — Eretmodus cyanostictus "Ulwile Island"
  2. Eretmodus cyanostictus (Boulenger, 1898) — FishBase species summary
  3. Eschmeyer's Catalog of Fishes (Eretmodus / cyanostictus entries)
  4. Eretmodus cyanostictus Boulenger, 1898 — GBIF
  5. Morley & Balshine (2003), Reproductive biology of Eretmodus cyanostictus, a cichlid fish from Lake Tanganyika — Environmental Biology of Fishes
  6. Taylor, Morley, Rico & Balshine (2003), Evidence for genetic monogamy and female-biased dispersal in Eretmodus cyanostictus — Molecular Ecology