Palauan Riffle Dwarf Goby - Stiphodon pelewensis Fish Profile & Care Guide
Introduction
The Palauan Riffle Dwarf Goby (Stiphodon pelewensis) is a small, stream-dwelling sicydiine goby native to the western Pacific. Still uncommon in the aquarium hobby, it is a standout nano species, and when males reach dominance, they can show striking deep black tones with vivid turquoise highlights.
The Palauan Riffle Dwarf Goby is not a tight “shoaling” fish in the tetra sense. In streams, individuals occupy feeding stations on rockwork, and you will often see loose, local groupings where the grazing is best. Social friction is mostly about space and display, with males known to court in the water column, flash colour, and chase rival males, so harmony improves when there are plenty of separate grazing areas and broken sight-lines. During the upstream return phase, post-larvae can move in mixed-species shoals, but adults settle into a more scattered, station-based lifestyle.
When it comes to the Palauan Riffle Dwarf Goby, choose companions that are peaceful, unlikely to harass bottom-dwellers, and happy in a high-flow, oxygen-rich “stream” setup. Avoid large or boisterous fish, as Stiphodon can be easily intimidated and may struggle to feed properly. Be cautious with pushy bottom species that will compete heavily for the same biofilm-covered surfaces. In nature, these habitats often hold relatively few fish species, but can overlap with other gobies and some loach-like stream specialists, and they commonly coexist with shrimps and snails.
When keeping Palauan Riffle Dwarf Gobies, the key is to replicate a rocky riffle environment rather than a typical calm community tank. Build around smooth stones, cobbles, and stable rockwork, then drive strong circulation with robust filtration and additional flow to keep surfaces clean and well-oxygenated. Bright lighting helps develop the thin, nutritious biofilm layer these fish naturally scrape from hard surfaces, and the aquarium should be mature enough that this grazing resource is reliably present, with supplementary foods used to support, not replace, that natural feeding mode. Keep maintenance consistent, prevent organic build-up that can smother grazing films, and make the tank escape-resistant, as stream gobies are excellent clingers and can explore surprisingly well.
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Sexual Dimorphism
Palauan Riffle Dwarf Gobies show clear sexual dimorphism, both in colour and pattern, which becomes more obvious as the fish mature. Males are typically brownish with several faint vertical bars along the rear half of the body, and they develop a distinctly metallic green sheen across the head. Their second dorsal and anal fins also tend to darken, ranging from reddish-brown through to a dusky tone as they settle into dominance and begin displaying to rivals and potential mates. Females are more subtly coloured but still very attractive, with stronger linear markings. They commonly show a dark mid-lateral stripe along the body and darker blotches around the caudal peduncle, giving them a crisp, horizontally striped look rather than the male’s blockier bars and intensified fin colour.
Quick Facts
| Scientific Name | Stiphodon pelewensis |
|---|---|
| Year Described | 2015 |
| Other Names | Sumatra Pelewen Riffle Goby, Black Stiphodon, Daintree Cling Goby |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Gobiiformes |
| Family | Oxudercidae |
| Genus | Stiphodon |
| Origins | Papua New Guinea Indonesia Solomon Islands Vanuatu Australia |
| Approx Max Size | 5 cm |
| Temperament | Peaceful |
| Aquarium Level | Bottom - Middle |
| Difficulty | Beginner - Intermediate |
| Shoaling | NA |
| Best kept as | 1 Male + Several Females |
| Diet & Feeding | Omnivore |
| Reproduction | Egg Depositor |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 7.5 |
| GH | 2 - 12 |
| TDS | 36 - 215 |
| ℉ | 72 - 82 |
|---|---|
| ℃ | 22 - 28 |
Natural Habitat
The Palauan Riffle Dwarf Goby is a western Pacific species recorded from Palau and a range of nearby island groups and regions, including New Guinea, Indonesia, the Solomon Islands, Vanuatu, and New Caledonia, with populations also documented from far north-eastern Australia. It is best thought of as a specialist of short, coastal island streams, places where clear, fast-flowing water runs over rock and boulder beds and is constantly replenished and highly oxygenated.
Adults typically occupy riffles and runs and will also hold in calmer pockets between faster lanes, clinging to hard surfaces and working across them as they graze. Many Stiphodon are most common in upstream reaches that are naturally protected from most other fishes by waterfalls or steep cascades, which helps explain why they are often associated with stream sections above cataracts on tropical, often volcanic islands.
Breeding
Palauan Riffle Dwarf Gobies follow the typical sicydiine goby pattern and are amphidromous. Adults condition and spawn in freshwater, with the female depositing a clutch of tiny, adhesive eggs on the underside of stones or similar hard surfaces in flowing water. The male then takes over, guarding and fanning the eggs to keep them clean and well-oxygenated until they hatch. After hatching, the larvae are naturally carried downstream and out to the sea, where they develop before later returning upstream into freshwater as young fish. That ocean phase is the main reason breeding success in home aquaria is uncommon: you are not just trying to trigger spawning; you also need a workable approach for rearing drifting larvae through a marine stage and then transitioning them back to freshwater.
Diet & Feeding
In the wild, Palauan Riffle Dwarf Gobies are dedicated grazers that spend much of their day rasping at rock surfaces and other hard substrates, ingesting algal biofilms and the tiny organisms living within them. It will also occasionally pick up small bottom-dwelling invertebrates, but grazing is its primary feeding method. In the aquarium, this means it does best when it can continuously browse natural growth on stones, wood, and even the glass, rather than relying on big “meal” feeds. A mature setup where biofilm and soft algae are allowed to develop is important, then you can supplement with sinking, algae-based foods and other vegetable matter, so it always has something appropriate available at the bottom. Meaty frozen foods may be included, but they are best treated as occasional extras rather than the foundation of the diet.
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Published: 27 Feb 2026
Last Updated: 27 Feb 2026