Saher wrasse
Halichoeres binotopsis
Hailing from the Western Pacific, the Halichoeres binotopsis is a small, active wrasse identified by two dorsal ocelli. It brilliantly controls reef pests but demands a deep sand bed to thrive.
Water Temperature
22 - 27 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
Bottom and middle
Adult size
9 cm
Minimum tank volume
>= 150 L
Minimum group
>= 1
Species description
Geographical Origin and Habitat: This species is native to the Western Pacific Ocean, including Singapore, Indonesia, the Philippines, and Taiwan. It inhabits shallow coastal reefs, tide pools, and rocky areas.
Taxonomy and Morphology: Classified within the family Labridae, under the genus Halichoeres. Features an elongated, slender body with a pointed snout and terminal mouth. Grows to an adult length of 8-10 centimeters.
Social Behavior: Active and diurnal. It spends the day swimming and searching the rocks for small benthic organisms. It buries itself completely in the sand bed to sleep at night or when threatened.
Coloration and Sexual Dimorphism: The body displays a greenish-yellow base color with pinkish facial stripes. Characterized by two dark black ocelli (spots) on the dorsal fin. Males are more colorful than females.
Care, breeding and tankmates
Aquarium Setup: An aquarium of at least 200 liters is recommended. A deep substrate of fine, smooth sand (5-7 cm deep) is mandatory to support the fish's natural night-burying behavior. Provide live rock caves.
Diet and Feeding: Carnivorous. Feed a variety of frozen foods such as mysis shrimp, brine shrimp, chopped krill, and commercial marine pellets. Feed at least twice a day to support its high activity levels.
Water Quality: Keep standard marine parameters stable: temperature of 23.0 to 27.0 °C, pH of 8.1 to 8.4, and specific gravity of 1.020 to 1.025. Standard protein skimming and moderate flow are advised.
Compatibility and Cohabitation: Peaceful with most reef inhabitants of similar size. Not fully reef-safe with small ornamental shrimps, crabs, or feather dusters, which it may consider prey.
Aquarium Breeding: Not recorded in home aquariums. They are pelagic spawners, releasing eggs into the water column. Culturing the microscopic pelagic larvae is extremely difficult in closed systems.
Risks and Diseases: Jumps easily when startled; a covered tank is essential. Lack of a proper sand bed leads to physical injuries on the snout, chronic stress, and susceptibility to marine velvet.
Geographic Origin and Distribution
This species is native to the Western Pacific Ocean, including Singapore, Indonesia, the Philippines, and Taiwan. It inhabits shallow coastal reefs, tide pools, and rocky areas.
Origin
Tropical oceans and reefsSouth and Southeast AsiaEast Asia
Fish profile
- Temperament
- Active
- These wrasses are inquisitive, active, and generally peaceful community fish, although they can sometimes exhibit a semi-aggressive streak. They are constantly on the move, investigating crevices in the live rock for tiny morsels of food. While they do not usually bother corals directly, their constant picking behavior might accidentally irritate some sensitive polyps. Overall, they make a lively and entertaining addition to a moderately aggressive marine community tank.
- Diet
- Carnivore
- This species is strictly carnivorous in its dietary habits. Their diet should consist of a variety of meaty foods including frozen mysis shrimp, vitamin-enriched brine shrimp, and high-quality marine flakes or pellets. In the wild, they naturally prey on small benthic invertebrates found among the rocks. Offering multiple small meals a day helps mimic their natural foraging behavior.
- Life expectancy
- 5-7 years
- This small and lively Indo-Pacific species, which lives mainly in shallow waters and coral lagoons, shows a life expectancy in captivity of between five and seven years. As an active fish that constantly patrols the rocks in search of small invertebrates, the presence of a well-established aquarium with plenty of live rock and fine sand is essential to support its biological well-being. To ensure its longevity, it is crucial to feed the fish several times a day with small portions of high-quality frozen food, minimizing food competition with more aggressive species.
- Adult size
- 9 cm
- The catalog's scalar value is 9 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 8.9 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Halichoeres binotopsis (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Solitary
- Many species within this genus are protogynous hermaphrodites, meaning dominant females can transition into males if needed. It is usually best to keep them singly or as a single male with multiple females if the tank is exceptionally large. Keeping two males in the same tank will almost certainly result in constant territorial disputes and fighting. Observing their intricate social structure and potential color changes during transition is fascinating.
- Feeding frequency
- Twice daily
- Due to their highly active nature and high metabolisms, they require frequent feedings throughout the day. It is highly recommended to feed them at least two to three times daily. Providing smaller, more frequent meals is much better than offering one large meal. This feeding schedule ensures they maintain a healthy body weight and vibrant coloration.
- Bioload
- The bioload produced by this fish is considered moderate. They are very active swimmers and consume a significant amount of food, producing a fair amount of waste in return. Regular water changes and strong biological filtration are necessary to maintain pristine water quality. Protein skimmers are highly recommended for marine setups housing these energetic wrasses.
- Flow
- Strong
- These fish thrive in aquariums with moderate to strong water flow throughout the tank. Good circulation closely mimics their natural reef environments and keeps them active and healthy. Powerheads should be strategically placed to create varied flow patterns mimicking ocean currents. However, ensure there are still some lower flow resting areas within the rockwork for them to retreat to.
- Jump risk
- Yes
- Wrasses in this genus are notorious jumpers, especially when startled, chased, or newly introduced to an aquarium. A tight-fitting lid or a fine mesh screen is absolutely mandatory to keep them safe. Many aquarists have unfortunately lost these beautiful fish due to open-top tanks or small gaps in the canopy. The jump risk remains exceptionally high throughout their entire lifespan in captivity.
- Reproduction
- Not bred in captivity
- Breeding these wrasses in a home aquarium is extremely rare and very difficult to achieve. They are pelagic spawners, naturally releasing their eggs and sperm directly into the water column. The resulting larvae require specialized microscopic foods and undergo a long, vulnerable planktonic stage. Therefore, almost all specimens available in the aquarium trade are wild-caught rather than captive-bred.
- Compatibility & tankmates
- Reef safe
- The Halichoeres binotopsis wrasses are generally peaceful but can be aggressive towards smaller invertebrates like ornamental shrimp and feather dusters. They are considered reef safe with caution, as they will hunt for small prey. They usually coexist well with other similarly sized, semi-aggressive fish but might bully much smaller, more docile species. It is crucial not to keep them with large, aggressive predators that might see them as a snack.
- Tank level
- Middle/Bottom
- They are highly active fish that will enthusiastically utilize all levels of the aquarium. However, they spend a significant amount of time hovering near the rockwork and sandy substrate actively looking for food. They require a deep sand bed of at least two to three inches to bury themselves in at night or when frightened. During the daytime, they will constantly patrol the middle and bottom sections of the tank.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.4 ± 0.5 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01, b = 3.09
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
