Long-finned Goby
Valenciennea longipinnis
Characterized by highly elongated dorsal fin spines, the Long-finned Goby is an energetic sand-sifting specialist. It continuously works to keep reef substrates flawlessly aerated and clean.
Water Temperature
22 - 27 °C
pH Value
8 - 8.5
Water type
Marine
Tank level
Bottom
Adult size
18 cm
Minimum tank volume
>= 150 L
Minimum group
>= 1
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: Indo-West Pacific: East Africa to the Line Islands, north to southern Japan, south to northern Australia. Found on sandy flats and lagoons of coral reefs.
Taxonomy and Morphology: Member of the family Gobiidae. Can grow up to 18 cm in length. Cylindrical body with eyes positioned high on the head, featuring elongated, thread-like dorsal fin rays.
Social Behavior: Solitary or paired sleeper goby. Exhibits a constant sand-sifting behavior, scooping up mouthfuls of sand and filtering out tiny invertebrates and organic material through the gills.
Coloration and Sexual Dimorphism: Sand-colored body decorated with pale blue or reddish-orange horizontal lines and spots. Fins may show iridescent margins. Males often possess longer filaments on their dorsal fins.
Care, breeding and tankmates
Aquarium Setup: Requires a tank of at least 150 liters with a broad, mature sand bed (at least 6-8 cm deep) of fine grain. Avoid coarse substrate which can cause damage to their delicate gill structures.
Diet and Feeding: Omnivore. Primarily consumes microfauna from the substrate. Must be offered multiple small daily feedings of frozen mysis, brine shrimp, and fine sinking foods to prevent starvation.
Water Quality: Stable parameters: temperature 22-27°C, pH 8.0-8.5, salinity 1.020-1.026. Good mechanical filtration is necessary to clear suspended debris kicked up by sifting.
Compatibility and Cohabitation: Peaceful with mid-water and top-dwelling species. Highly territorial towards conspecifics and other sand-sifting gobies unless kept as a established pair.
Aquarium Breeding: Demersal spawner. Pairs construct a nesting chamber beneath rocks, often sealing the door. Larvae are pelagic and very challenging to rear in captivity.
Risks and Diseases: Extreme jumping risk; the aquarium must be covered tightly. Frequently suffers from nutritional wasting if the aquarium lacks a mature, biological sand bed.
Geographic Origin and Distribution
Indo-West Pacific: East Africa to the Line Islands, north to southern Japan, south to northern Australia. Found on sandy flats and lagoons of coral reefs.
Origin
Tropical oceans and reefsAfrica and MadagascarEast AsiaAustralia, New Guinea, and Oceania
Fish profile
- Temperament
- Peaceful
- Overall, it has a timid and peaceful temperament toward completely different fish species. It tends to ignore other tank inhabitants, focusing entirely on its sand-sifting duties. It can be easily intimidated by aggressive or hyperactive tank mates, which may cause it to hide and refuse food. A calm environment allows its natural, industrious behavior to shine.
- Diet
- Omnivore
- This species is a carnivorous sand-sifter that relies heavily on benthic microfauna. It constantly scoops mouthfuls of sand, sifting out small crustaceans, worms, and organic matter through its gills. While they will accept prepared frozen foods like mysis and brine shrimp, a mature sandbed teeming with copepods is essential for long-term survival. Supplementary feeding multiple times a day may be required if the tank lacks sufficient natural food.
- Life expectancy
- 3-5 years
- The average lifespan in an aquarium for Valenciennea longipinnis is between 3 and 5 years when housed in a well-established tank. In the wild, they live shorter lives due to high predation pressure on coral reefs. A spacious environment with plenty of mature sand and consistent feedings will support their long-term well-being.
- Adult size
- 18 cm
- The catalog's scalar value is 18 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 18 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Valenciennea longipinnis (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
- Flexible
- They are best kept individually or in confirmed male-female pairs. Two males will inevitably fight, often to the death, over territory in the same tank. Pairing them can be tricky since they are not strongly sexually dimorphic. Acquiring an established pair from a reputable source is the safest way to house two individuals together.
- Feeding frequency
- Twice daily
- Due to their active metabolism and constant foraging, these gobies need to feed frequently. They should be offered small amounts of food at least two to three times daily if the natural microfauna is limited. A well-established refugium can help supply a continuous source of pods. Without adequate feedings, they are prone to slowly starving in captivity.
- Bioload
- Medium
- This marine goby has a relatively low bioload compared to larger predatory fish. Its constant sand-sifting behavior actually helps process detritus and uneaten food in the substrate. Maintaining a healthy sandbed is crucial for biological filtration with this species. Therefore, a mature aquarium with a deep sand bed will easily handle the minimal waste it produces.
- Flow
- Strong
- These gobies appreciate moderate to gentle water flow that does not disturb the sandbed excessively. High, sweeping currents can blow away their carefully constructed burrows and strip the sand of organic matter. A steady but diffused flow helps oxygenate the water while keeping their benthic environment stable. Ensuring lower flow near the bottom of the tank is highly recommended.
- Jump risk
- Yes
- Like most gobies, this species is notorious for its jumping abilities, especially when startled. They can easily launch themselves out of an open-top aquarium or through small gaps in the lid. A tight-fitting lid or fine mesh screen is absolutely mandatory to prevent tragedy. Extra caution should be taken during the first few weeks of acclimation when they are most skittish.
- Reproduction
- Oviparous
- Breeding in captivity is possible but rearing the fry is extremely challenging. They are demersal spawners, typically laying their adhesive eggs on the ceiling of a burrow or a protected cave. The male guards and aerates the clutch until they hatch into pelagic larvae. Because the larvae are microscopic and require specialized rotifer diets, few successfully raise them in home aquariums.
- Compatibility & tankmates
- Peaceful
- It is generally peaceful and reef-safe, ignoring corals and most other fish. However, it can be fiercely territorial toward other sand-sifting gobies or fish with a similar body shape. Keeping them in established male-female pairs is recommended to avoid conspecific aggression. They make excellent tank mates for quiet, non-aggressive species.
- Tank level
- Bottom
- This fish is almost exclusively a bottom-dweller, spending its day hovering just above the substrate. It continuously interacts with the sandbed, digging and sifting to find food. It will construct a burrow under liverock, where it retreats when threatened and sleeps at night. Providing plenty of open sandy areas and secure rockwork is essential.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3 ± 0.1 se
- Resilience
- Medium (1.4 - 4.4 years)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.00692, b = 3.09
- VulnerabilityLow vulnerability (12 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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