|Latin name||Thalassoma jansenii - (Bleeker, 1856)|
|Common name||Jansen's wrasse|
|Family||Labridae - Thalassoma|
|Origin||East Indian Ocean, Australia, Japan, Indonesia, Central/West Pacific|
|Max length||20.0 cm (7.9")|
As aquarium fish
Jumps out of open aquaria
This species is known to jump out of open aquaria.
This species can be extremely aggressive towards other fish.
Be careful when keeping these fish together with peaceful or docile species. Regular feeding, plenty of hiding places and a lot of space can alleviate aggressive behavior to some degree.
Can nibble at clams
This species sometimes nibbles at clams including Tridacna species.
Demand a very large aquarium when fully grown
This species needs a very large aquarium when fully grown.
Exactly how big the aquarium should be is hard to say, but the size of this species is such, that it cannot normally be kept in a home aquarium.
Can be a threat to small fishes, crustaceans and other invertebrates
This species can be a threat for small fishes, crustaceans, worms, snails etc.
This fish requires feeding several times a day, especially when newly added.
When the fish can find its natural food in the aquarium it requires less frequent feeding.
Thrive best on their own
These fish flourish better without other members of the same species in the aquarium.
Requires a varied diet
This species must be fed with an appropriately varied diet.
Requires plenty of space for swimming.
This species revels in swimming and requires an aquarium with ample space.
This species can change gender from female to male.
When a male is needed, a female changes sex and takes on the role.
Eats Pyramid snails
This species can be used to combat Pyramid snails.
One can of course be unlucky in having an individual that refuses to eat them.
Removes parasitic life
This species is able to remove parasites from fish.
It does not have a great impact on a large outbreak of marine ich (Cryptocaryon), for example, but it contributes towards keeping fish parasite free.
Constant cleaning can stress the fish in the aquarium, so one should not add this fish which removes parasites, if the fish are already weakened through other causes.
Not all specimens actively clean fish.
This species needs good hiding places, for example, between live rocks.
Genus description (Thalassoma)
Thalassoma species are beautiful both as juveniles and as adult fish, even though there is quite a difference in appearance. On the whole, they quickly grow too large for most aquaria and are therefore often offered for sale.
Depending on size they live on everything from Artemia to larger invertebrates like snails, crustaceans and sea urchins. They are well able to smash larger crustaceans on rocks to get pieces small enough to swallow.
Large individuals can be extremely aggressive towards other fish and will happily eat the smaller ones.
They should really be fed three times daily, as they are very active, which incidentally, means they require a lot of swimming space.
Although these Wrasses often dig themselves into the sand, a sandy substrate is not absolutely necessary for them to thrive.
Family description (Labridae)
Wrasses are nearly always seen in reef aquaria, since many of the species are both attractive and useful in battling a range of unwanted invertebrates like i.e. flatworms, pyramide snails.
These fish live of everything from zooplankton to large crustaceans, sea urchins and the like.
The needs and behaviour of Wrasses vary greatly, so it is vital to familiarize oneself with the specific species before buying one.
|Distribution||Indo-West Pacific: Maldives to Fiji, north to southern Japan, south to Lord Howe Island.|
|English common names||Jansen's wrasse|
References and further reading
Bob Fenner. Wrasses of the Genus Thalassoma - Wet Web Media - (English)
Scott W. Michael. 2009. Wrasses and Parrotfishes (Reef Fishes Series Book 5) - TFH Publications / Microcosm Ltd. - (English)
Froese, R. and D. Pauly. Editors. 2014. FishBase. World Wide Web electronic publication. www.fishbase.org, version (08/2014).
|hermaphroditic, aggressive territorial, pyramid snail, eats tridacna, eats shrimp, eats crab, eats snails, eats fish, eats bristleworm polychaete fireworm|