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Rhinogobius brunneus, commonly known as the Amur Goby, is a small, benthic freshwater fish belonging to the family Gobiidae. It is characterized by its cryptic coloration, often blending seamlessly with its substrate, and its distinctive goby-specific fused pelvic fins forming a suction cup. This species exhibits sexual dimorphism, particularly during breeding season, with males displaying more vibrant coloration and elongated fin rays. It is an important component of the freshwater ecosystems it inhabits, serving as both a predator of small invertebrates and a prey item for larger fish and birds.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Highly variable, typically mottled brown, grey, and olive green, with darker blotches and spots that aid in camouflage. Males often display more intense coloration, especially during breeding, with iridescent blue or red markings on fins and body. Underside is usually lighter.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Fused pelvic fins forming a disc-like suction cup, Two distinct dorsal fins, Large head with prominent eyes, Cryptic coloration for camouflage
- Dorsal fin
- Two dorsal fins; the first dorsal fin has 6-7 spines, and the second dorsal fin has 1 spine and 8-10 soft rays. The first dorsal fin in males can be elongated.
- Tail fin
- Rounded to slightly emarginate caudal fin.
- Pectoral fin
- Large, fan-like pectoral fins with 16-19 rays.
- Distinctive fins
- Pelvic fins are completely fused into a single, adhesive disc, characteristic of gobies, used for clinging to substrates.
Identification Tips
Pelvic Fins
Look for the distinctive fused pelvic fins that form a suction cup on the underside, a key characteristic of gobies.
Dorsal Fins
Observe the two separate dorsal fins; the first is spiny, and the second is soft-rayed. Males may have an elongated first dorsal fin.
Coloration and Pattern
Note the mottled brown, grey, and olive coloration with irregular dark blotches, providing excellent camouflage against rocky or gravelly bottoms.
Head Shape
The head is relatively large and broad compared to the body, with prominent, dorsally-placed eyes.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderate depths, often near the bottom.
- Environment
- Prefers clear, flowing freshwater environments such as rivers, streams, and lakes with rocky or gravelly substrates. Often found in areas with moderate current and abundant hiding places among rocks and submerged vegetation.
- Geographic range
- Native to East Asia, primarily found in the Amur River basin (Russia, China), Korea, and Japan. Its range extends to various river systems and coastal drainages in these regions.
Aquarium Information
- Care level: intermediate
- Temperament: territorial
- Diet: carnivore
- Minimum tank size: 20 gallons
- Temperature: 18-24°C (64-75°F)
- pH level: 6.5-7.5
- Hardness: 5-15 dGH
- Compatibility: Best kept in a species-specific tank or with other robust, similarly sized, non-aggressive bottom dwellers. Can be territorial towards conspecifics, especially males.
- Special requirements: Requires a well-filtered tank with plenty of hiding spots (rocks, caves, driftwood) and a fine sand or small gravel substrate. Good water quality and stable parameters are crucial. Live or frozen foods are preferred.
Wild Information
- Conservation status: least concern
- Seasonality: Spawning typically occurs in spring and early summer, influenced by water temperature and photoperiod.
- Market price: Low
- Commercial importance: low
- Taste: Mild, slightly earthy
- Texture: Firm, flaky
- Cooking methods: Fried, Grilled, Stewed
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Master of Camouflagebehavior
The Amur Goby's mottled coloration allows it to blend almost perfectly with rocky and gravelly riverbeds, making it incredibly difficult to spot.
Suction Cup Feetamazing
Its fused pelvic fins act as a powerful suction cup, enabling it to cling to rocks in strong currents, a crucial adaptation for its riverine habitat.
Parental Carebehavior
Male Amur Gobies are dedicated parents, guarding the eggs laid by the female in a hidden nest, often under a rock or in a crevice, until they hatch.
Sexual Dimorphisminteresting
During breeding season, male Amur Gobies develop more vibrant colors and elongated fin rays, particularly the first dorsal fin, to attract females.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: Amur Gobies are not venomous. Handle with care to avoid stress to the fish. Their small size and delicate nature mean they should be handled minimally and gently if necessary.
Similar Species
Chameleon Goby
Tridentiger trigonocephalus
The Chameleon Goby typically has three distinct dark blotches along its lateral line and often exhibits more pronounced color changes. Its head is generally less robust than R. brunneus.
Flathead Goby
Glossogobius giuris
The Flathead Goby is generally larger, has a more depressed head, and its coloration is typically lighter with fewer distinct markings. Its geographic range also differs, being more widespread in Indo-Pacific regions.
Other Rhinogobius species
Various Rhinogobius spp.
Distinguishing R. brunneus from other closely related Rhinogobius species often requires careful examination of fin ray counts, specific body proportions, and subtle differences in coloration patterns, particularly in males during breeding. Genetic analysis is sometimes necessary for definitive identification.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Gobiiformes
- Family
- Gobiidae
- Genus
- Rhinogobius
- Species
- Rhinogobius brunneus
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