Orange-shoulder Surgeonfish
(Acanthurus olivaceus)

Descrição

The user asked for a product description for `Acanthurus olivaceus`.

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* **Scientific Name:** `Acanthurus olivaceus`
* **Common Name:** Orangeshoulder Tang, Orangeband Surgeonfish, Orangespot Surgeonfish, Olive Tang, Orange-epaulette Surgeonfish – I will use “Orangeshoulder Tang” as the primary common name and include others in the description.
* **Maximum Size:** 35 cm (14 inches). Some sources say 25 cm (10 inches) or up to 12 inches (30.5 cm), and 8 inches (20 cm). I will go with the commonly cited 35 cm or 14 inches as the maximum, but acknowledge the typical size can be smaller.
* **Origin:** Indo-Pacific region, including Christmas Island, Cocos Keeling Islands, southern Japan, Australia, Indonesia, Philippines, Hawaii.
* **pH Range:** 8.1-8.4. One source says 8.0-8.5. I will use 8.1-8.4.
* **Temperature:** 22-28°C (72-82°F). I will use 22-28°C.
* **Lifespan:** 5-10 years in captivity, up to 35 years in wild. I will use 5-10 years in captivity.
* **Swimming Zone:** All areas / Mid to Bottom (grazing on rocks/sand, but also active swimmers). Often grazes on rocks and sand. Active swimmer, needs open space.
* **Overview (Appearance & Behavior):**
* Juveniles: Bright yellow, sometimes with blue fringing on fins, subtle hint of orange spot.
* Adults: Dramatic color change to olive-gray or brownish-olive body, with a prominent orange stripe/patch behind the pectoral fin (outlined in dark blue/purple/black). Rear half turns darker gray-blue. Caudal fin becomes lyre-shaped..
* Behavior: Active, constant swimmer. Grazes on algae, detritus, diatoms from rocks and sand. Can be solitary or school, especially as adults. Has caudal scalpel for defense.
* **Care Level:** Moderate to Advanced. Some sources say “Average” or “Easy” for experienced. Given the tank size and water stability needs, “Intermediate to Advanced” seems appropriate to encourage responsible ownership.
* **Temperament:** Semi-aggressive. Generally peaceful towards other fish, but territorial towards other tangs, especially similar species or body shapes. Best kept one per tank unless very large system with simultaneous introduction.
* **Compatibility:** Reef-safe (does not harm corals or invertebrates, helps control algae) unless underfed. Best with similarly sized, non-aggressive tankmates.
* **Tank Essentials:**
* Minimum Tank Size: 473-680 L (125-180 gallons). Some say 800L (211 gal). I’ll use 680 L (180 gallons) as a good, responsible minimum for adults, suggesting larger.
* Requires ample swimming space, live rock for grazing/hiding, good flow, stable water parameters.
* **Diet:** Herbivorous/Omnivore (primary algae/plant matter). Feeds on detritus, diatoms, filamentous algae. Needs marine-based seaweed, nori, spirulina, algae flakes/pellets, fresh greens. Can accept meaty foods but primary diet must be algae. Feed multiple times a day. Important for immune system.

Confidence Score: 5/5 – I have a good amount of consistent information from multiple reputable sources.

Strategizing complete. I will now generate the response based on the compiled information.

Orangeshoulder Tang: A Vibrant Algae Grazer for Your Reef

Add dynamic color and natural algae control to your large marine aquarium with the stunning Orangeshoulder Tang. Watch its remarkable transformation from juvenile yellow to adult olive-grey.

Overview

The Orangeshoulder Tang (*Acanthurus olivaceus*) is admired for its striking color transformation. Juveniles display a bright yellow body with subtle blue accents on their fins. As they mature, they develop a distinctive olive-grey body, famously highlighted by a bold orange, black-edged stripe behind the pectoral fin. These active, graceful swimmers will constantly explore your aquascape, meticulously grazing on algae and adding lively movement to the mid-to-bottom swimming zones of your tank.

Care Level

This species is considered intermediate to advanced in care due to its size and specific tank requirements. While generally peaceful towards other fish, Orangeshoulder Tangs can exhibit semi-aggressive and territorial behavior towards other tangs, especially those of similar shape or coloration. It is generally recommended to keep only one per aquarium unless housing in a very large system where multiple tangs can be introduced simultaneously.

Tank Essentials

A minimum tank size of 680 litres (180 gallons) is essential for an adult Orangeshoulder Tang to thrive, with larger tanks highly recommended to provide ample swimming space. Your aquarium should feature abundant live rock for grazing and hiding, alongside open areas for their active swimming habits. Maintain stable water parameters with a pH range of 8.1-8.4 and a temperature of 22-28°C.

Diet

The Orangeshoulder Tang is primarily herbivorous, feeding on algae, diatoms, and detritus found on rocks and sand. Provide a varied diet rich in marine-based seaweed, such as nori, spirulina, and high-quality herbivore pellets, offered multiple times daily. While they may accept meaty foods, an algae-dominant diet is crucial for their robust health and strong immune system.

Why Buy From Us

When you buy Orangeshoulder Tang online from us, you receive healthy, responsibly sourced marine fish. We prioritize ethical acclimation and humane shipping practices, ensuring your new aquatic companion arrives in prime condition. Our expert team is dedicated to providing you with vibrant, healthy aquarium fish and comprehensive support for your successful marine ecosystem.

• Scientific Name: Acanthurus olivaceus
• Common Name / Variant: Orangeshoulder Tang
• Maximum Size: 35 cm
• Origin: Indo-Pacific
• pH Range: 8.1–8.4
• Temperature: 22–28°C
• Lifespan: 5–10 years
• Swimming Zone: Mid | Bottom

Bring the beauty of the Orangeshoulder Tang to your home reef today!