Riffle Goby

Riffle Goby (Stiphodon pelewensis) is a stunning hillstream goby from the fast-flowing coastal streams of the tropical Pacific. Males display vivid blue-green to turquoise coloration with orange to red elements — a classic Stiphodon color scheme from the Palauan island streams. Like all Stiphodon, this species is a specialized algae and biofilm grazer with a remarkable life history — adults live in freshwater streams but larvae develop in the ocean before migrating back upstream, sometimes climbing waterfalls with suction-cup pelvic fins.

Feeding & Care Tip: Live algae and biofilm growing on rocks and glass are the primary and most important food source — this fish cannot be kept without established algae growth in the aquarium. Supplement with Hikari Mini Algae Wafers placed directly on rocks and blanched zucchini or spinach. Hikari Frozen or Freeze-Dried Baby Brine Shrimp can be offered very sparingly. Pristine, well-oxygenated water with good flow is essential.

⚠ Algae Requirement: Like Otocinclus catfish, Stiphodon gobies are specialized algae and biofilm grazers that cannot survive without established live algae growing on rocks, glass, and hardscape. A tank without significant algae and biofilm growth will not sustain these fish regardless of supplemental feeding. Allow algae to establish thoroughly before adding Stiphodon. Hikari Mini Algae Wafers placed directly on rocks supplement but do not replace live algae growth. Blanched zucchini or spinach on rocks provides additional plant matter.

Stiphodon gobies inhabit clear, fast-flowing, well-oxygenated hillstreams with rocky substrate covered in algae and biofilm. The aquarium should replicate these conditions: strong filtration, good water movement, rocky substrate and hardscape with established algae growth, and pristine water quality. These fish are sensitive to elevated nitrates and should never be added to immature aquariums. Males are territorial with each other but peaceful with other species.

Note on Breeding: Stiphodon gobies have an amphidromous life cycle — adults live and spawn in freshwater streams, but the newly hatched larvae drift downstream to the ocean where they spend the first weeks developing in marine conditions before migrating back upstream into fresh water. This remarkable journey sometimes involves climbing waterfalls using their modified pelvic fins as suction cups. Captive breeding is not possible due to this marine larval stage.

Male riffle gobies are among the most colorful small freshwater fish available — and the contrast between the spectacular males and cryptic females is one of the most dramatic examples of sexual dimorphism in freshwater fish. A well-set-up hillstream aquarium with established algae growth and a small group of these gobies is a genuinely extraordinary display.

Care & Ideal Parameters