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Thalassoma jansenii

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Common name: Jansen's wrasse. This fish has a cream-colored elongated body with 4 black rings. The Thalassoma jansenii is an active, very lively fish that needs a decor rich in hiding places. It can be kept in a 250-liter aquarium and is very peaceful.

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Data sheet

Delivery price Europe
Fixed price €29 - Offered starting from €249 of living*
Minimum order amount for live products
50€ excluding shipping costs. For the well-being of the animals, do not make them travel alone.
Maintenance
Easy
Temperament
Peaceful
Food
Carnivore
Reef compatibility
Compatible
Recommended number
Alone
Price according to size
XS S M L XL
Maximum size
25 cm
Delivery date
Choose your delivery day at the "Address" step in your cart.
Reproduction
Impossible
Package information for the winter period
A hole is made in the cardboard to supply the chemical heater with oxygen.

En savoir plus

Thalassoma jansenii: the Jansen's Wrasse, a lively swimmer with contrasting patterns

The Thalassoma jansenii, known as the Jansen's Wrasse, is a particularly lively and colorful marine wrasse native to the coral reefs of the Indo-Pacific. This fish is sought after for its high activity level, robustness, and elegant patterns, making it perfect for enlivening spacious reef aquariums.

The Jansen's Wrasse has an elongated cream-colored body adorned with four distinctive black rings that give it a unique and easily recognizable appearance. It can reach a size of up to 20 cm as an adult, and like all fish of the Thalassoma genus, it is known for its fast swimming and curious behavior.

Active and territorial behavior

The Thalassoma jansenii is a great swimmer with a lively temperament. It spends much of its time exploring its environment, searching for food and new hiding places. Therefore, this Jansen's Wrasse requires a substantial swimming space and complex structures to feel fully comfortable.

It is important to note that, although peaceful towards most robust tank companions, it may prey on small shrimp as well as some small delicate fish. It is therefore advisable to keep it with species of an appropriate size and assertive temperament.

A minimum 300-liter aquarium for its well-being

For the optimal maintenance of a Jansen's Wrasse, a tank of at least 300 liters is essential. It is recommended to provide:

  • A decor rich in live rock creating multiple hiding places and tunnels,
  • An open area for free swimming,
  • Moderate to strong water movement to support its need for oxygenation.

Stable parameters and effective filtration are essential to maintain its energy and vibrant colors.

A diverse carnivorous diet

The Thalassoma jansenii is an opportunistic carnivore. Its diet must be varied to maintain its vitality. It particularly enjoys:

  • Artemia, mysis, and krill either thawed or live,
  • Small pieces of shrimp, mussels, and squid,
  • High-quality marine protein pellets for wrasses.

Feeding two to three times a day is recommended to meet its high energy needs.

A dynamic fish for experienced reef keepers

The Jansen's Wrasse is an excellent choice for aquarists looking to animate a spacious reef aquarium. Its vigor, natural elegance, and ease of adaptation make it a must-have fish for robust community tanks.

With a large swimming space, well-structured decor, and a varied diet, the Thalassoma jansenii will become a dynamic, colorful, and resilient resident of your marine aquarium.

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