Knight Goby
Behaviour Shy, timid, territorial, predatory
Typical size 7cm
Max size 9cm
Tank Area Bottom, middle
Min Tank Size 75cm
Temp Min: 22℃ Max: 26℃
Feeding Sinking foods, live or frozen foods, may take flake
pH Range 7-8.5
Hardness m,h,vh
Knight Goby Stigmatogobius sadanundio
  • Knight Goby Stigmatogobius sadanundio - thumbnail

Knight Goby

Stigmatogobius sadanundio

Whilst this fish’s body is a fairly dull pale grey colour, it has a body speckled with black dots and being a goby, has a unique movement and differing finnage to the usual tropical fare. Although often sold as a brackish fish, Knight Gobies are usually found in freshwater habitats and can be kept in either freshwater or mildly brackish conditions. These fish can be aggressive, particularly towards their own species so they are best kept singly, or given plenty of space for each individual. Tank mates should also be of a similar size and robust nature, particularly those that inhabit the same lower region of the aquarium. Other fish that are small enough to eat will be considered food. Having said this, overly boisterous or aggressive species should also be avoided since the Knight Goby is a generally timid and shy fish. Knight Gobies are sand sifters, and will dig amongst the substrate so a sandy bottom or fine grade substrate is preferable. Places to hide (caves, bogwood, plants) are essential since the fish can be sensitive to bright lighting. Provide good water conditions and filtration to maintain health. Whilst not a fish suited for beginners, the Knight Goby has plenty of character and is an excellent fish for more advanced fish keepers.

Family Gobiidae (Gobies) | Synonyms Gobius sadanundio, Gobius apogonius, Vaimosa spilopleura | Other names Spotted Goby | Origin Asia: India, Indonesia | Breeding Cave spawner | Natural Water Conditions pH 7-8, soft to hard | Natural Habitat Estuaries, tidal areas, mainly freshwater | Sexing Males have larger anal and dorsal (second) fins and extended fin rays. Females may appear more yellowish

Have a Knight Goby Problem or General Question?

If you have a question about keeping Knight Goby's then please use our Knight Goby help forum. Join 100's of other fish enthusiasts with 1000's of years experience between them.

question mark     

Think Fish Community Creator - Knight Goby

Please check your water type for compatibility with your fish, which can be found on the Knight Goby information box.

If you'd like to talk about the "Knight Goby" with our users, then we have a buzzing community of fish enthusiasts where you can talk about tank issues, fish behaviour, tank stocking and any other issues related to the Knight Goby fish or other types you may have!

To save your details in the Fish Community Creator you must be logged in CLICK HERE to log-in or join

Like this tool? Help keep us online by becoming a think fish supporter and helping with our hosting and development costs!

Tank Details
question mark  Rename your tank:
question mark  Length: (cm)
question mark  Volume: (Litres)
question mark  Filter type:

* This fishtank will only last for this session - to save your tank please Join/Log in

question mark  Max Stocking level: 0cm
0-1 months 20%: 0cm
1-3 months 40%: 0cm
3-6 months 60%: 0cm
question mark  Current stock level: 0cm
Stock percentage: 0%
question mark  Suggested maximum
fish size for your tank:
My Fishtank Quantity Stock cm
There are no fish in your fishtank. To add fish, view a fish profile and click the 'Add to My Fishtank' button
This tool is a guide only. All fish have individual natures and compatibility can never be guaranteed. If you spot anything you think needs improving, contact us at

Click to read the Latest Think Fish Discussions from Thinkfish users.

Tropical Fish Keeping Help and Advice
Fish of the month