Zebra Otocinclus
Zebra Otocinclus (Otocinclus cocama) is one of the most visually striking members of the genus. The pale cream body is crossed by bold, clearly defined dark brown to black horizontal stripes — a crisp zebra pattern that stands out dramatically against the muted tones of most otocinclus species. In good condition, the contrast between pale cream and deep brown is clean and graphic, making this one of the most eye-catching algae eaters available.
Feeding & Care Tip: Live algae growing on the aquarium glass, plants, and hardscape is the single most important food source for Otocinclus — a tank without established algae growth will not sustain these fish regardless of what supplemental food is offered. Allow biofilm and green algae to develop on surfaces before adding otos, and do not over-clean the aquarium. Supplement with Hikari Mini Algae Wafers placed directly on the glass or substrate, and offer blanched vegetables — zucchini, cucumber, or spinach — 2–3 times per week. Remove uneaten vegetable matter within 24 hours to prevent water quality issues.
Native to the Peruvian Amazon — specifically the Ucayali River and its tributaries around Iquitos in Loreto, Peru. This species inhabits slow-moving, slightly acidic to neutral waters with clean substrate and abundant algae-covered surfaces. Like all wild-caught otos it requires a mature, stable aquarium with established algae growth.
Otocinclus are schooling fish that are markedly more confident, active, and healthy in groups. A lone otocinclus is a stressed otocinclus — it will hide constantly, refuse supplemental food, and decline over time. Keep a minimum of six, and ideally eight or more. In a proper group they are bold, constantly grazing, and frequently seen resting together in clusters on broad plant leaves or the aquarium glass.
Otocinclus are notoriously sensitive during the transition from the wild to captivity — virtually all trade specimens are wild-caught, and the stress of collection and shipping leaves them vulnerable in the first weeks. Slow, careful drip acclimation over at least an hour is strongly recommended. A mature aquarium with established algae growth, stable water parameters, clean water, and good oxygenation gives newly arrived fish the best possible start.
Care & Ideal Parameters
| Difficulty | Moderate |
| Temperament | Peaceful — Community |
| Typical Adult Size | 1.75 inches (4.5 cm) |
| Min. Group Size | 6 minimum — groups of 8+ strongly recommended |
| Ideal Temp | 72–79°F (22–26°C) |
| Ideal pH | 6.0–7.0 |
| Ideal GH | 2–12 dGH |
| Ideal KH | 1–6 dKH |
| Primary Food | Live algae and biofilm (from aquarium surfaces); Hikari Mini Algae Wafers |
| Supplemental Food | Blanched zucchini, cucumber, or spinach — offered 2–3 times per week |
| Origin | Ucayali River and tributaries, Loreto, Peru |
| Notes | Bold zebra stripe pattern is distinctive — one of the most visually striking otos. Wild-caught only. Established algae essential before adding. Sensitive during acclimation — drip acclimate slowly. Groups of 6+ required. |
