News / Species Spotlight / Highly Underrated Fish - Aquacultured Court Jester Goby (04/13/15)

Highly Underrated Fish - Aquacultured Court Jester Goby

The Wild Background

Koumansetta rainfordi was once classified as Amblygobius rainfordi; adding to this confusion, it has at least 4 very commonly used names. It has been called Court Jester Goby, Rainford's Goby, Orange (or Red) Lined Goby and Old Glory Goby. It doesn't really matter what you want to call it, this is one great fish.

Wild gobies are found singly and sometimes in small aggregations in turbid water less than 50 feet deep. Generally they are found over sandy or muddy bottoms surrounding tropical patch reefs. Of course, these weren't found in any of those places, having been aquacultured. Naturally, they would range throughout Indonesia, Philippines to Fiji and Australia.

They have a pretty small max size at just about three inches.

The Aquacultured Version

Other than sourcing, and one important aspect of captive husbandry, wild and aquacultured versions of this fish are exactly the same. They are both peaceful, both graze on hair algae, and can thrive in smaller than average marine aquariums. Not only that, but these fish are excellent predators of a myriad of nuisance critters in the home aquarium. For aquariums smaller than 75 gallons, this is one of the few grazing fish that can be kept in that same size tank until full grow out. As an extra added bonus, they aren't a threat to desirable invertebrates.

Wild caught Rainfords' need to graze throughout the day, making them excellent algae controllers, but it also means that in aquariums without hair algae, they will require more frequent feeding. The aquacultured animals are still very happy to munch on nuisance greenery all day long, but will also readily take pelletized foods as long as they are small enough. This means they can take less feedings, and it's easier to get them multiple feedings as auto-feeders can be utilized.

We stock these fish in a "smaller than wild" average size. They are perfect for adding in small groups, or singly to smaller aquariums. Here they are taking a mix of meaty foods as well as some more protein dense processed offerings. House with fish that have fairly passive personalities as these fish can be easily bullied.

Allen & Erdmann, Reef Fishes Of The East Indies, 1st ed. (Conservation International, Renon, Bali, Indonesia, 2012)
Scott W. Michael, Marine Fishes, 1st ed. (T.F.H. Publications Inc, New Jersey, 2001).
Rudie H Kuiter & Helmut Debelius, World Atlas of Marine Fishes, 1st ed. (IKAN-Unterwasserarchiv 2006)
In House Resources: Adam Mangino, Eli Fleishauer