- Scientific name: Stigmatogobius sadanundio
- Synonyms: Gobius apogonius, Gobius sadanundio
- Common name: Knight Goby, Fan Dance Goby
- Group: Brackish fishes
- Habitat: Asia; Pakistan, India, Bangladesh, Sri Lanka, Thailand, Cambodia, Malaysia, Singapore, Indonesia and Fiji
- Size: 9 cm
- Biotope: Inhabits in estuaries and tidal zone of rivers. Prefers fresh water, rarely found in brackish water
- Social behavior: Peaceful fish, but territorial towards conspecifics. It can be kept in small groups with plenty of hiding places. Do not combine with small fish as they may be eaten. It may also nip the fins of slow-moving or long-finned species.
- Diet: Omnivorous; They prefer live foods, but also eat dried and frozen foods. Occassionally add some vegetable matter in their diet and they will often browse on green algae in the aquarium.
- Breeding: Quite hard
- Tank: Minimum 80 litres
- Population: 3-4 fish for 120 litres
- Decoration: Sandy substrate with rock structures that form lots of caves, so the fish can form territories. You can add a few plants which can tolerate brackish water.
- Temperature: 20-26 °C
- pH: 7-8.5
- Hardness: 10-20 NK°
- Salinity: 10-20 gramm salt/10 litres
- Lifespan: 5-7 years
Description: The Knight Goby’s body is pearly grey with three or four roughly aligned rows of round black spots along the sides. Knight Goby has two dorsal fins, the first consists of about six stiffly held rays, and has an elongated blackish spot, the second is equal in length to the long-based anal fin, and both have dark spots at the bases. The fish will be more active and visible during daylight, especially under dim lighting. Bright light makes them skittish.
Mature males have higher dorsal fin. Females are samaller with rounder and often more yellowish body. Higher temperatures (24-28 °C) and the addition of some fresh water could trigger spawning. Knight gobys are cave spawners and after a prolonged courtship the female deposits up to 1000 eggs on the roof of the selected cave. The male then cares for the brood until the eggs hatch. When the fry are free swimming, they can be fed with brine shrimp nauplii.
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